Some results
ZXNet echo conference «hardware.zx»
Hello Mick
Mic> If there are two or more zeros, in principle this is no longer logical. You can have the one you need
Mic> confuse the keyboard.
Mic>
Because your logic is somehow wrong.
I’m telling you secrets - learn while you live:
We need to interrogate 10 different buttons. But I don’t want to move zero right away. Let's look at
what rows are these buttons in, put zeros there, we’ll find out at once whether it’s necessary at all
scan.
> In the standard BASIC 48 firmware, they scan there, with one zero
> go through all the lines and thereby determine the necessary combinations such
> like EDIT, EXTMODE, etc. or is it not so?
Anril into your hands - and dig in... Or is it really not interesting?
Hello caro
"about SHIFT fixation"
And I also wanted ALT...
"it makes no sense to introduce a new one"
But this is useful from a practical point of view...
And the costs are minimal.
Hello, lvd
Actually iron - display of the pressed key on the ZX keyboard,
plus support for polling by "all zeros"
It will turn out cheap and cheerful :) Just decide how to flash the RTs...
For a mouse - the scheme is a little more complicated, only the initial one
initialization is necessary...
From these considerations - how about using D5,D7 port #FE?
And along the way, does it make sense to connect the keyboard receiver register as a port?
Hello ASDT
ASD> Actually iron - displaying the pressed key on the ZX keyboard,
ASD> plus support for polling by "all zeros"
I hope they didn’t forget about fixing the SHIFT keys.
ASD> And by the way, does it make sense to connect the keyboard receiver register as a port?
There is no standard for this, and it makes no sense to introduce a new one.
Hello ASDT
The main thing BUT is that there is no real basis for these “topics”
(I re-read it again...) And accordingly the adapter
for the keyboard - external to the ZX device.
Hello caro
"usefulness is doubtful"
For example, there was a thread about the connection between two ZXs...
You can transfer at least 1MB/sec.
Hello ASDT
ASD> "usefulness - doubtful"
ASD> For example, there was a thread about the connection between two ZXs...
ASD> You can transfer at least 1 MB/sec.
How to transmit - the keyboard controller port is read-only.
Hello ASDT
ASD> And I also wanted ALT...
There is no such key in Spectrum
ASD> But this is useful from a practical point of view...
ASD> And the costs are minimal.
As for usefulness, it is doubtful.
What's the point of having two sources of information about the keyboard.
Hello ASDT
The development process has changed direction :)
Actually the question is - a transformerless power supply for the ZX?
Ensure correct phasing...
What other stones could there be?
Hello ASDT
From the TV output...
If the signal frequency is limited to 5 MHz, then
we get 320 points (together with the sync pulse).
If you subtract the synchronization - 262.
Maybe where am I wrong?
Hello ASDT
I found a jamb :) We need to double the number of points.
Now it’s clear why quartz is 14 MHz - the frequency is
up to 3.5 MHz (and it’s clear why it can’t be raised higher)
Hello ASDT
ASD> By output to TV...
ASD> If the signal frequency is limited to 5 MHz, then
ASD> we get 320 points (together with the sync pulse).
ASD> If you subtract the synchronization - 262.
ASD> Maybe I'm wrong where?
Maybe you are wrong somewhere, because you are confusing the bandwidth and the number of pixels. What would
do not refer you to reading books on the basics of television, I will offer the following visual
example: we send a square wave (rectangular pulses) with a frequency of 5 MHz to the TV,
(of course, we don’t supply sync pulses in places). What do we see on the screen?
That's right, a field where 262 black and 262 light dots alternate in each line.
I hope there is no need to display .
P.S. The luminance bandwidth of PAL/SECAM B,G,H is indeed limited to 5 MHz
(SECAM D,K,L C 6MHz), but the frequency is 6MHz (SECAM D,K,L C 7MHz).
P.P.S. Interestingly, in the settings of video adapters, for PAL it is indicated
resolution 720x576 (or even 768x576), which also means a top frequency of about
7 MHz.
Hello ASDT
In it is quite possible and worth it. For example, for standard
ZX Spectrum resolutions of more than 3.5 MHz brightness signal are not needed. But what
concerns the upper limit, then for the television standard (PAL/SECAM) it is clearly higher. If
interesting, look at this tutorial for example
["http://www.do.sssu.ru/virt/library/uchebnik/tv/tvindex.html"], and in particular
this chapter ["http://www.do.sssu.ru/virt/library/uchebnik/tv/moderntv.html"].
Hello ASDT
Weight and dimensions must be adequate.
Hello ASDT
By power source.
Transformerless - you need a good choke, which reduces all the advantages to 0.
Impulse (ready) transfers. didn’t find it... they don’t carry it...
From what we have, it's an ordinary trance. at 220 (and there are always plenty of them) and
imp. stabilizer. This is the most optimal so far.
In the meantime, a question arose about the legality of the software for ZX...
What is his status?
Hello ASDT
ASD> The development process has changed direction :)
ASD> Actually the question is - transformerless power supply for ZX?
ASD> Ensure correct phasing ...
ASD> What other stones could there be?
ASD> By power source.
ASD> Transformerless - you need a good choke, which reduces everything to 0
ASD> advantages.
ASD> Pulse (ready) transfers. didn’t find it... they don’t carry it...
ASD> From what we have, it's an ordinary trance. at 220 (and there are always plenty of them) and
ASD> imp. stabilizer. This is the most optimal so far.
ASD>
I didn’t understand anything. Do you need a power source for the spec? Take PC! ATX
some type of power man - not the cheapest and not the most expensive
half a kilowatt =)
Do you want to make an impulse generator yourself? Look towards tiny (m/skh such, they are kept in
get yourself a high-voltage switch and a controller with stabilization). Google "top switch"
"tiny switch". I did it myself on the lowest-powered tiny one (though not for spec).
The scheme is as simple as 2 kopecks, from a complex one - just wind the trans (wound on
ready pot, calculated the number of turns for it and wound it).
Hello ASDT
ASD> Weight and dimensions must be adequate.
The cover can be removed. You will have powers that do not require a fan.
Hello ASDT
We have different concepts...
What about the software... can anyone enlighten me?
Hello ASDT
Here's an interesting solution
File: 2809commo.jpg http://zx.pk.ru/attachment.php?attachmentid=3177
Hello ASDT
This is a Mini-ITX in a commodore case. And there is also nano-ITX!
Install the emulator and go ahead :)
Hello ASDT
"Many routers are made on ARMs"
If anyone is researching this topic... I'm sorry...
Hello ASDT
Hmm, it’s not very good in the rush with industrial computers on ARMs, even the price tag is nobody
does not install from manufacturers...
We'll have to reinvent the wheel ourselves: unless, of course, anyone wants to stop
exactly this option.
Hello fan
fan> Hmm, in a rush with industrial computers on ARMs it’s not very good, even
fan> none of the manufacturers put a price tag...
fan>
fan> We'll have to reinvent the wheel ourselves: unless, of course, someone wants to
fan> stop with this option.
Well, in rush they are not particularly used, and many people sell automated workstations themselves...
Hello ASDT
"research routers" I don’t have them and won’t buy them...
Hello ASDT
ASD> "Many routers are made on ARM"
ASD> If anyone is researching this topic... Unfortunately, I gave up...
Should I investigate routers or tinker with ARMs? ;)
Hello ASDT
"Number of clock cycles between INTs" This means that the processor speed is not high :)
"Apparently I don't understand the context"
The idea is that as a means of combating the “zoo” of clones
“adopt the ZX-256 standard”, and consider 48/128k as requiring improvement.
This is a consideration from the topic about axes... There was a question about their support...
And the situation will be similar to the transition 48-128...
And actually this is a very theoretical question :)
Hello ASDT
2 jdigreze; nothing; I don’t understand :) Well, God be with him :)
Hello ASDT
Yes, we’re not talking about axes... For most programs nothing is needed...
Programs for 128k do not work on 48k...
So why not use 128k?
And just for example.
For example, a screen printing program... if running
program for 128k, where should it be placed?
Accordingly, “above” 128k. Those. new features
require new memory.
Hello ASDT
Ah! Well, if the context is about the OS, then I can say the following from myself: to me,
Let's say I need a calculator... Why use the 256K model if I don't need it?
more than 48K? As a living example, at home I have Tsel-600 and 192 RAM, and I don’t need
compress the video, and I don’t play with toys, why should I install an OS that
is the minimum required, say 512 RAM? But there is an ideological
compatibility at the application launch level, and I’m not going to install XP for myself,
I'll be content with the less gluttonous 2K. In our case I will be lost like
user of a new OS, if I have, say, 128K RAM. And this is not good news, right?
how I will be lost not only as a user, but also as a potential
developer of new programs. And no one is forcing me to upgrade to 256K
maybe. ;)
PS: Thank Nemo that I have KAY-1024! :)
Hello ASDT
I'm talking about whether it makes sense for a program of 5K size due to the needs of the OS
use only 256K and higher... No matter how crazy it turns out.
And if your program requires 100K, then, naturally, it will not work in
48K.
This is what I mean in the context of the OS. Those. The OS should run at 48K. And if there is a program
for this OS, requires 100K, then it should complain about lack of memory and
return safely to the OS. But if the program needs 5K, it’s fine
will start and work.
And the class of programs that requires the maximum amount of “brains” is well defined -
programs for working with video/sound. For others there should be a choice - whether we work
in 48K or 128K or 256K or more.
And, to be honest, that is. "with my right hand on the Bible", then I am AGAINST the universal
"ATM machines". And I think that it is necessary and must observe modularity, since
it is not known in advance what kind of hardware the program will encounter with the final
user. Those. there must be room for maneuver.
PS: IMHO, it’s time to move this chatter to the section about the OS...
Hello jdigreze
ASD> And just for example.
ASD> For example, a screen printing program...
ASD> if a program for 128k is running, where should it be placed?
ASD> Accordingly, “above” 128k. Those. new functions require new memory.
And if we abstract from the OS. Then I don’t understand at all why, for example,
the screen printer to be placed somewhere other than the space allocated for it...
The idea, in fact, is close and understandable to me.
As I wrote above, the problem is using memory above 128K entirely and
is completely under the control of the programmer who writes this or that
program. And if he desperately needs 256K, why not use this
opportunity?
If we return to the hardware, we get several types of connections (organizations)
memory above 128K. No one will introduce any standard now. From
The only real motherboard manufacturers left now are CHRV & NedoPC team,
the rest are not visible on the horizon, and are unlikely to be. And the iron produced
completely satisfies the question posed, i.e. has a memory of more than 256K. And,
By the way, using a smaller volume in the current conditions is simply economical
unreasonable, since, in fact, it does not affect the cost.
Now, I think, the issue can be safely removed from the agenda, since everythingThe sheep have been counted, there are no losses, the wolves are well fed. ;)
And for those who assemble the Spectrum themselves: it is recommended
install RAM with a capacity of at least 256K with one of the following enabled
common schemes.
PS: Phew... I was already out of breath while I was writing. I hope the incident is over and that’s it
understood. ;)
Hello jdigreze
Sorry for interrupting here. passed by :)
jdi> That is. The OS must run in 48K
gee ;) well, even in the worst nightmare the limit from below is 128k and not 48 :) maybe
another 16k remember or zx80/81 :D
jdi> Of the real manufacturers of motherboards, only CHRV remains now
That’s right, in terms of service life, 90% of 128k cars have already died, 1024k are being produced
use at least 256k. all other cries about 128k are from "emulators"
human rights defenders."
What, for example, even gives 256k with the “correct” ROM firmware for the OS - at least
- emulation of a short tr-dos disk with 128k mode in the upper RAM - for support
A screw/flash drive is a primary necessity for the OS in general.
PS// moved on
Hello ASDT
Here. Correctly stated. Otherwise I'm lazy... :)
Hello ASDT
"So if anyone really needs a driver"
Of course you don't need it :)
"all such conversations are loosely connected"
How to say... For myself, I decided what and why to do with that Leningrad,
what do I have :)
Well, and a coordinate system, for all sorts of “projects” ...
It's easy to define a "spherical horse in a vacuum" :)
Hello ASDT
"from unnecessary words" Well, there is a small-small benefit, for myself :)
Hello ASDT
Revision 0.2 :)
Options for developing “new ZX hardware”:
1) PC emulator (miniPC of different types) for the ZX case
2.3) Development of a ZX emulator computer (modern processor)
Probably as a by-product of development for other purposes.
Minimizing hardware and consumption.
Otherwise, it’s more profitable than point 1
4) New implementation based on logic (“clone”) - “retro engineering”
5) Devices for existing "clones"
(Memory expansion up to 256k, etc.)
Hello ASDT
and I’m already getting lazy to surf the forum...
nothing changes from unnecessary words.
Hello ASDT
Unfortunately (or not? ;)) all such conversations are poorly connected with reality
programming on Spectrum. Mythical OS will never leave its partition
forum zx.pk.ru, because they are not viable and no one needs them. Real
the Spectrum programmer has exclusive access to both the processor and
memory. And if it is more convenient for him to use a minimum of 256Kb, then he will do so
do it because I don’t owe anyone anything (everything is free) and so as not to delay
deadlines for writing the program (otherwise you may not have enough patience and desire to complete the
end).
It follows that the method of distributing programs in source form helps
programmers spend less time writing their own analogues
existing procedures, which means it speeds up the writing of programs and increases the chances
that the program will even be born. So if someone really needs
driver for working with memory above 128Kb I will gladly share and help with it
use. This will be my modest contribution to the writing of new programs.
p.s. There is a wonderful joke about a spherical horse in a vacuum. No need
adapt theory to practice.
Hello ASDT
ASD> "So if someone really needs a driver"
ASD> Of course not needed :)
ASD> "all such conversations are loosely connected"
ASD> How to say... For myself, I decided what and why to do with that
ASD> Leningrad,
ASD> what do I have :)
ASD> Well, and a coordinate system, for all kinds of “projects” ...
ASD> It's easy to define a "spherical horse in a vacuum" :)
Gentlemen, we're done with the horses... Let's be productive. And then again some
the flame begins!
Hello ASDT
G1183 EU, but it’s not for pentagon-atmas... You should take the Chinese ones.
Hello ASDT
Along the way. A good case for ZX costs 100-150r...
If the source costs 150 rubles, then it will be very nice...
Hello ASDT
ASD> Along the way. A good case for ZX costs 100-150 rubles...
ASD> If the source costs 150 rubles, then it will be very nice...
WHAT kind of case is it, where are the prices from?
Hello ASDT
Spe> Mythical OS will never leave their forum section zx.pk.ru,
Spe> because they are not viable and no one needs them. Real Spectrum
Spe> the programmer has exclusive access to both the processor and
Spe> memory. And if it is more convenient for him to use a minimum of 256Kb, then he
Spe> will do so, since he doesn’t owe anyone anything (everything is free)
Spe> and in order not to delay the deadline for writing the program (otherwise it may not
Spe> have enough patience and desire to see it through to the end).
The point of the OS is to make software development easier.
If the OS has tools to work for 256K, then the programmer may not
think about how to do this on this particular machine.
Spe> It follows that the method of distributing programs in the form
Spe> source codes, helps programmers spend less time on
Spe> writing your own analogues of existing procedures, which means
Spe> speeds up the writing of programs and increases the chances that the program will work at all
Spe> will be born.
Wonderful.
The OS is a set of useful procedures.
If the OS is multitasking, then all programs can use one instanceof these procedures, and not drag out each of its own options. Each program will be smaller.
More programs can be simultaneously loaded into memory. :)
Hello ASDT
During the brutal struggle against Leningrad, I thought...
Why do you need a curb? Those. his bits are in port.
If the screen is expanded, then in its place is information
and if not, then you can clean the extension page...
Hello ASDT
"Iron" SPI
Hello ASDT
"Software support?" If you can't do it yourself, no one will do it...
I'll be there myself :)
"Have the ports been selected yet?" No.
Hello ASDT
Here is a synchronization scheme close to “synchronous” :)
File: Sync-A.zip http://zx.pk.ru/attachment.php?attachmentid=3523
Hello ASDT
I finished remaking Leningrad-1, it seems to have worked...
For 41256-10 without WAIT.
A completely synchronous circuit did not come out, but as a concept it will work :)
From video extensions - attribute per byte, replacing border with extended
screen...
The plans include an “iron” PC keyboard adapter and a card port :)
Hello ASDT
Software support? Have the ports already been selected?
Hello ASDT
Please clarify about the "card port"
Hello ASDT
There were errors in the circuit... But everything seems to be working...
Even the Z80, which was considered dead, works :)
Next, screw on the catfish port and sew up the bottle hole...
Which port should I hang it on (if anyone needs it)?
Hello ASDT
Note - 555 multiplexers do not pass... Unless added to the circuit
elements.
And one more thing.
The memory has a "Row address hold time", for 41256-10 = 15ns min.
I installed multiplexers 1531 - it works...
If anyone understands this issue, please write back.
I’m thinking of dividing the turn-on time from the Z state - to exclude
currents through open multiplexers.
Hello ASDT
It seems that all types work - from 555 to 1531... paradox :)
I'm finishing off the bootloader with COM (tape recorder port).
Software above 38400 is difficult, that’s why it’s like that.
Hello ASDT
Here's another question... After all, you need to read port 7ffd.
Otherwise how to use memory in interrupts...
Hello ASDT
ASD> Here's another question... After all, you need to read port 7ffd.
ASD> Otherwise, how to use memory in interrupts...
why is this and what's the point?
Hello ASDT
“Why is this and what’s the point?” That's what I thought
about pseudo-multitasking :)
Hello ASDT
"AYka port"
That's what I planned... But it's not in stores :)
I'll go back to the ones I missed...
And still dark. Loading and communication via soft-COM...
That is PC as a ZX server :)
Format, protocol, etc.
Hello ASDT
"section "catalog" of the site"
Like order? :) Well, I don’t even know...
I try to focus on what is in stores.
Money is a commodity immediately :)
Hello ASDT
hint: in order not to create unnecessary left ports, just connect the necessary signals with
7FFD to external port AYka
Hello ASDT
ASD> "AYka port"
ASD> That's what I planned... But it's not in stores :)
ASD> I'll go back to the ones I missed...
ASD>
Look at the "catalog" section of the site indicated in my signature.
Hello ASDT
"there is a separating capacitor there"
So what? I'm talking about the logical definition.
How the capacitors are there - I don’t care...
If a program defines - COM, then it can
direct access to files on the connected device.
Hello ASDT
Slowly forward... :)
Along the way, the question arose - how to distinguish between the magnetic input
is a COM or a tape recorder connected?
I suggest this:
stable 1 - COM,
stable 0 - magic,
transitions - not defined? (tape recorder?)
Old programs will be fine...
Hello ASDT
The separating capacitor will not be rolled there specifically to get rid of
from constant component
Hello ASDT
ASD> Slowly forward... :)
ASD> Along the way, the question arose - how to distinguish between the magnetic input
ASD> is COM or tape recorder connected?
ASD> I suggest this:
ASD> stable 1 - COM,
ASD> stable 0 - magic,
ASD> transitions - not defined? (tape recorder?)
ASD> Old programs will be exactly ...
I don’t understand... The m/f must be connected to the m/f port, and COM is on this port
Well, it doesn't look right. Moreover, for a normal COM you need a controller, like
ZX_MultiCard.
ASDT, explain what the idea is... ;)
Hello ASDT
For example, you can modify "ZX OPEN ROM" (it seems)
for working with files via COM.
And finalize the input circuit to determine the connection
simple enough....
"By the way, why do you need a controller for COM?"
More speed, buffering...
But it’s also possible with software.
Hello jdigreze
jdi> I don’t understand... The m/f must be connected to the m/f port, and COM to
jdi> doesn't look good on this port. Especially for a normal COM
jdi> you need a controller like ZX_MultiCard.
jdi> ASDT, explain what the idea is... ;)
The point is to use the existing tape port additionally in
as a serial port. In this case, the COM mode is determined by a constant
by the presence of a unit at the input, I think everything else is not COM, which means
tape recorder. By the way, why do you need a controller for COM?
Hello ASDT
"the connected RS232 device may give you a "0"
That is it gives something itself... without your participation...
AI probably...
"just connect to digital input and output,"
That's what we're talking about... But the tape recorder is not limited in any way - either-or...
Hello ASDT
Well, if you exclude the use of m/f altogether, then it is enough to connect to
digital input and output, for example, max232cpe or a simple circuit on
discrete. And forget about auto-detection, because any connected device is RS232
maybe give you "0" at the input ;)
IMHO, it's probably better to use a separate port for COM...
In general, with a controller it is not only faster, but also more reliable, plus there
protocol control lines are used, and software support is much
simpler.
Hello ASDT
"The ZX Spectrum 128 firmware initially has built-in procedures"
Something like this...
"Maximum speed 9600 baud."
You can safely go up to 19200, it seems...
"via port A (register 14)
music coprocessor."
It's not available everywhere, but the tape recorder port is everywhere.
Hello ASDT
"at this moment something may go along the line..." Misconception... :)
And if you plug it into a power socket, it might burn out...
"Yes, and coordinate them Nuno." A couple of diodes will save... :)
"implemented in software, but does not sit on the m/f port."
The point is to make minimal modifications,
and the rest is software.
Hello caro
Give me a midi sequencer on spec!!! :eek;
By the way; elders, how many serial ports can a spec be “pumped”, let
turbocharged (7Mhz), recording at a maximum speed of 31,250? Let's say
what if these are TV series like on the multicard? This seems to be the first question
to Caro, as the developer of this device.
Hello ASDT
car> The ZX Spectrum 128 firmware initially has built-in operating procedures
car> with software RS232.
car>
car> Code:
car> L0121 jp L06d8 ; RS232 input
car> L0124 jp L07ca ; RS232 output (1)
car> L0127 jp L08a3 ; RS232 output (2)
Uh, where are the MIDI exhaust procedures?
Hello, caro
10X !!!
Hello ASDT
AI is that at this moment something can go along the line... This means that it is not enough
In what order will the user access the port? Moreover
if you want to install an m/f on the same port, which can also give God knows what,
Yes, and coordinate them Nuno.
And there is one more pitfall - Spec's clock frequency "turbo/non-turbo" (I
I also saw a turbo magician at 14 MHz... But this is already offtopic ;)) That is. need
determine delays in the program for each mode.
PS: Actually, this is quite possible, although you won’t get much speed. U
INFORKOM had a book "Do-it-yourself Peripherals", in it there was a diagram "ZX Lprint
III" (or something like that). So in this circuit RS232 is implemented in software,
It just doesn’t sit on the m/f port.
Hello ASDT
ASD> The point is to make minimal modifications
ASD> and the rest is software.
The ZX Spectrum 128 firmware initially has built-in operating procedures
with software RS232.
┌─- CODE ───
L0121 jp L06d8 ; RS232 input
L0124 jp L07ca ; RS232 output (1)
L0127 jp L08a3 ; RS232 output (2)
└── CODE ───
Maximum speed 9600 baud.
Hardware RS232 is connected via port A (register 14)
music coprocessor.
File: ay3.png http://zx.pk.ru/attachment.php?attachmentid=3771
Hello fan
fan> Uh, where are the MIDI exhaust procedures?
┌─- CODE ───
L0118 jp L012d ; Keypad scan
L011b jp L0a05 ; Play music strings
L011e jp L11a3 ; Send to MIDI
└── CODE ───
Hello fan
fan> Is there anything new? Comedian ;) And this despite the fact that the hardware UART MIDI circuits
fan> never existed until recently :v2_lol;
This is; not Midi UART, but just UART, regular serial ports and they have been around for many years.
Midi is also a serial connection, the same COM, only as far as I remember
- current loop. And my interface is already more than ten years old. This is the device:
http://k5000.org/gear/Studio4_front.jpg :)
Hello fan
fan> A human MIDI interface is already being made by one friend, but I just can’t
fan> get to his site %( If anyone knows what's new on the site, then
fan> plz let me know.
fan>
fan> Actually here - http://zx.pk.ru/showthread.php?t=3609
There is nothing particularly new there.
This is more of a software issue. In general, there are ready-made MIDI interfaces with RS-232,
RS-422, LPT ports. All that remains is to support them on spec. With LPT for example
MOTU was made, with serials - Opcode, Emagic... My OpCode Studio 4 (8 in, 8
out) for example, it can be connected via two RS-422, but it can also be connected via one. And he is collected
generally on 6501 or something, plus four 40-legged UART micros, I don’t remember exactly which ones.
Almost the same spec in terms of power.
Hello Mike
Mik> There’s nothing particularly new there.
Is there anything new? Comedian ;) And this despite the fact that the hardware UART MIDI circuits are not
existed until recently :v2_lol:
Hello Mike
A human MIDI interface is already being made by one friend, but I still can’t use it
get to the site %(If anyone knows what’s new on the site, please let me know.
Actually here - http://zx.pk.ru/showthread.php?t=3609
Hello ASDT
"Hardware UART MIDI circuits never existed until recently"
UART is UART (hardware/software), MIDI is MIDI (hardware, protocol?)
And by the way, maybe someone can answer...
How much border is needed, i.e. if you don’t do it, what are the
losses... Maybe with examples....
Hello Mike
Mik> This is not Midi UART, but just UART, regular serial ports and that's it
Mik> for many years. Midi is also a serial connection, the same COM
Mik> only as far as I remember - a current loop.
UART MIDI is not just a UART, but a UART that transmits data via the MIDI protocol
. That comrade makes exactly the mid-range interface, and not something else (besides, he
uses a single chip rather than a separate chip).
Hello ASDT
"realization of the MIDI interface and writing software for it"
That is the main thing is not the implementation, the software for it... That's right. :)
Hello ASDT
Along the curb:
Just remaking Leningrad, I reached the ports...
And I don’t really want to make an “unnecessary part” of the FE port :)
The border area will be filled with additional pages (over 128k).
COM:
Now I have a simple COM bootloader installed, a program
The “preparation” of the data is complete and you can debug the software on the hardware.
Therefore, I am interested in the question of the direct access protocol
to files... I can come up with it myself, but if there are ready-made solutions...
Hello fan
fan> UART MIDI is not just a UART, but a UART that transmits data via mid-disk
fan> protocol . That comrade makes exactly the midish interface, and not something else
fan> something else (besides, it uses a single-chip, not a separate chip).
This is a COMPLETELY REGULAR UART. And he doesn’t care what to transmit/receive,
MIDI messages, work with a modem or with a mouse. All the differences between the midi interface
only electric and are connected in a current loop.
A midi interface for a COM port is a couple of loose microchips.
Hello ASDT
ASD> That is. the main thing is not the implementation, the software for it... That's right.
There will be no standardized hardware, there will be no software: D That’s why I
I insist first of all on specific practical implementation, and not
theoretical ;)
Hello Mike
Mik> This is a COMPLETELY REGULAR UART. And he doesn't care what
Mik> transmit/receive MIDI messages, work with or with a modem
Mik> with the mouse. All differences in the midi interface are only electrical and
Mik> are called in a current loop connection. MIDI interface under
Mik> A COM port is a pair of loose microchips.
I don’t understand where the argument started anymore) Therefore, point by point -
There has never been an “open” hardware UART on the spec, much less UART MIDI
(Schemes that are classified and died in God along with the software do not count).
The fact that you can tuck any microchip into the spec does not mean at all that it is already
was (with the same success one can say about connecting any hardware). I'm no longer
I'm talking about a huge variety of UART chip varieties and initialization methods and
managing them (no one wanted to take part in choosing the chip, although
Of the ones that can actually be obtained, there is only one + a timer).
Maybe a regular UART can be made to work with anything, but we were talking about
specific implementation of the MIDI interface mentioned above by comrade. (If you
who would like to propose their own specific implementation of the MIDI interface and write
software for it, then the flag is in your hands ;) , so far I only see one : ).
In short, the dispute is caused by the philosophical question “theoretical and practicalimplementations" %) There were no practical ones / they died in God, but I have no theoretical ones in this
I don’t accept the incident, because they’ve been talking about everything for a long time, but it’s only now come to fruition :( .
Hello ASDT
ASD> How much border is needed, i.e. if you don’t do it, what are the losses...
ASD> Maybe with examples....
IMHO, it is necessary. Example: loading from a tape recorder... ;)
Mik> I believe that in the classic Spec video mode it should
Mik> will remain, the only thing is that it can be reduced by 2-4 times in thickness
Mik> on each side, if it’s not difficult of course.
It is generally problematic to remove the upper and lower ones.
And the side ones are possible, but at the cost of losing square points. Those. can you make dots
like dashes, but I don’t think that will suit anyone.
P.S. UART (Universal Asyncronus Receiver Transmiter) - separate chip or part
MK, i.e. data converter "parallel<->serial", and the protocol
called RS232C. MIDI is a standard for connecting musical instruments to
computer. Includes description of both hardware and protocol
interactions.
Hello ASDT
"primarily on specific practical implementation"
I support! As soon as there is implementation, there will be a “standard”
Hello ASDT
Basically like this:
Does the Caro board have a serial port? Eat. You can increase their number to
four? Obviously it is possible. Will the spec attract the 4th flow at 32.250? I don't know, I hope
to the answer. Is it possible to make these ports electrically MIDI compatible? Even
no question, there are plenty of such schemes and they are primitive. Conclusion: if the spec has enough
performance, and I suspect that it will be enough, then the matter remains with the software and it will be
regular sequencer. Isn't this rulez? :) The path will even be in the tracker
form.
What follows is even more interesting. Since industrial midi interfaces already exist with
connection via serial and parallel ports, then again the matter remains with
software support.
That's the whole idea.
Hello ASDT
If so... Post another opinion about the border... :)
Hello fan
Mik> Will the spec handle the 4th flow at 32.250? I don’t know, I hope for an answer
the calculator was probably lost :) 32250 bps * 4 = 129000 bps = 16125 bytes/s
3500000 / 16125 = 217 clock cycles/byte... well, it seems like it won’t last that long :)
fan> There is already a “locked” single-chip, and you can use the midish protocol
fan> "switch" only by changing the firmware (the cheeses of which
fan> by the way, none).
wow, haven't read many recent books. I don’t understand what the iron problem is - four
serial port or what??? Well, make your own_separate_cool_controller
PS // why not make an external serial port splitter. Kamilevsky
The controller seems to have to hold 115,200 - each gets 28,800. possible in
sew this decoupler and all sorts of midish protocols, and it will pour into Spec
a flow that is already understandable only to software (well, you can figure out which one yourself).
Hello Mike
Mik> Does the Caro board have a serial port?
There’s already a “locked” single-chip, and you can use the midish protocol
"switch" only by changing the firmware (which, by the way, does not have any cheats).
Hello ASDT
ASD> Since that’s the case... Give me another opinion about the curb...
You said it without thinking
Hello ASDT
ASD> If possible, with an example. Those. such a program....
Anything that can be loaded from a gramophone (more precisely, from any audio media)
, because without a border it will be difficult to understand what is happening ;) (especially when you use
turbo loaders x4 ;) ).
Hello Ronin
Ron> PS // why not make an external serial port splitter.
Ron> The Kamilevsky controller seems to be supposed to hold 115200 - 28800 for each
Ron> donetsa. you can use this decoupler and all sorts of midish protocols
Ron> to sew, and into Spec it will pour a stream that is already understandable only to software (well
Ron> come up with one yourself).
Quite reasonable. This option has been used for a long time. Actually this is what it is
serial midi interface, as I have. The only thing I have is two
TV series with eight inputs and eight outputs, balancing the traffic of these two
serial streams. Although it also works on one series.
Hello fan
fan> There is already a “locked” single-chip, and you can use the midish protocol
fan> "switch" only by changing the firmware (the cheeses of which
fan> by the way, none).
The Midish protocol has nothing to do with hardware. Nothing there
no need to reflash. All you need is software.
Hello Mike
Mik> The Midish protocol has nothing to do with hardware.
Well, yes, but the transmission speed itself will drop: v2_lol:
Hello fan
fan> Well, yes, but the transmission speed itself will seem to be :v2_lol;
Well; Goodbye... As the software says, so it will be. Not on the Amiga, not on the pussy ports
Initially, no one counted on midi, but later they were like this
Serial midi connections worked fine on standard controllers.
Hello fan
fan> you can change the speed only after changing the firmware
I doubt it very much. (#F8EF & #F9EF)
Hello Mike
Mik> As the software says, so it will be.
Sir, you are a comedian though: D Here (i.e. on the multimap by Caro) it’s dead on
locked single-chip (you can change the speed only after changing
firmware), and not a separate UART chip that can be turned as you like.
Hello, fan
http://www.zx.pk.ru/showpost.php?p=45673&postcount=130
Hello Southern Bear
Yo... I thought this was just a description of the RS232 standard as such %(
Hello caro
car> The chip is of course not separate, but you can rotate the UART as you like
Great :) I didn’t know %(
Hence the question - any similar user manual was previously posted on the forum
? (Somehow I don’t remember/didn’t see this %((( )
Hello fan
fan> Sir, you are a comedian though :D Here (i.e. on the multimap by Caro)
fan> tightly locked single-chip (you can only change the speed
fan> after changing the firmware), and not a separate UART chip with which you can
fan> rotate as you like.
The chip is of course not separate, but the UART can be turned as you like :)
ZXMC emulates connection to Spectrum
ISA modem according to the Kondratiev scheme. Basic
modem port address on the Spectrum side = F8EFh.
RS232 operating speed can be set precisely
just like in IBM by setting the coefficient
division (CD) according to the following scheme:
CD ---- Speed
1 ------ 115200
2 ------ 57600
3 ------ 38400
4 ------ 28800
6 ------ 19200
12 ----- 9600
24 ----- 4800
48 ----- 2400
96 ----- 1200
192 ---- 600
etc.
To set the speed:
1) the 7th bit of the FBEFh port is set to 1 (DLAB=1);
2) The low byte of the CD is written to port F8EFh;
3) the high byte of the CD is written to port F9EFh;
4) the DLAB bit is reset to 0.
┌─- CODE ───
SER_P equ 0F8EFh
; 1) set speed = 19200 baud
ld bc,SER_P+3*100h
ld a,80h ;DLAB=1
out (c),a ;(FBEFh)=80h
ld b,SER_P/100h+1
xor a
out (c),a ;(F9EFh)=00h
dec b
ld a,6 ;Divisor=6(19200)
; 12(9600)
; 24(4800)
; 48(2400) out (c), a ;(F8EFh)=06h
ld b, SER_P/100h+3
ld a, 0 ;DLAB=0
out (c), a ;(FBEFh)=0
└── CODE ───
Hello fan
In general, that’s how it is. If you don't look at the addresses.
And it turns out that according to Kondratiev’s scheme, the internal
moped (not a VIN trim) which from the ISA side looked like a COM port c
connected moped. This is why programming is very similar. Of the differences
PC programming, by and large, only addresses and interrupts (their
absence).
Hello fan
“But I couldn’t find any information about what his absence threatens”
Likewise.
“I don’t really feel sorry for the unfortunate ventel”
Not the right word... :)
"and plug the quartz... and then back..."
I did this - I installed the socket, it worked fine.
Hello fan
fan> Yeah... And in order to connect to the midish protocol I also need quartz
fan> plug... and then back...
I already advised transferring this entire protocol to an external controller - then
the device will turn out to be more universal (PC/Amiga/Spec) and in general there’s no need to bother
for no reason with a soldering iron where you don’t need it :) who doesn’t have enough speed - take it from caro
USB controller, learn to program usb, and make this same controller on usb
:D
Hello Mike
ASD> And again...
ASD> Now about bit 5 7ffd.
ASD> What are the consequences of its absence?
Needed. But I couldn’t find any information about the consequences of his absence.
Why such wild savings: v2_eek; Not; I really feel sorry for the poor ventel ;)
Mik> Well, Caro has put all the points in place. Well, who is the comedian?
Yeah... And in order to get to the midish protocol I also need quartz
plug... and then back... :v2_lol:
Hello fan
fan> ... And in order to connect to the midish protocol I also need quartz
fan> plug... and then back... :v2_lol;
Protocol; MIDI provides an exchange rate of 31250 baud +-1%.
At a clock speed of 11.0592 MHz, which is currently running ZXMC
you can set the operating speed of RS232 = 31418 baud, which is 0.5% more,
but it fits within the tolerance.
Hello caro
car> The MIDI protocol provides an exchange rate of 31250 baud +-1%.
car> At a clock frequency of 11.0592 MHz, at which ZXMC currently operates
car> you can set the RS232 speed = 31418 baud, which is 0.5%
car> more,
car> but within the tolerance.
Well, in general, the Midya will not be offended. :)
Hello ASDT
I replaced the botloder with a “monitor” type program,
Now you can “feel” the ports with pens :)
And I added 256k...
Next is screen expansion. Byte attribute and border replacement.
It would be a sin not to use the entire screen with so many
"extra" memory...
If anyone has any thoughts to share, please post!
COM port... 38400 - works fine, you need to make a connection with the PC...
And then - according to plan...
Hello ASDT
In connection with RS.
Ideologically, the “server” is not suitable for PC...
That is communication is needed only for “one-time” data transfer.
And accordingly, for this it is optimal to use
a separate "downloadable" program.
Expansion to 256k - bit 5 of port 7ffd (and reading), this is logical...
Video extensions.
Attribute per byte - 2nd 8k pages are used (it’s much simpler...)
Screen extension - 3(6) additional. pages (vertical, horizontal,
corners) Also easy to do...
Video expansion port - 3ffd(and reading)
For now, I need to try software SPI (on AT45DB081B),
just which port to use... fe?
Hello ASDT
Well, here's the finale... :)
Minimalism has won.
Ports on board:
#xxFE - reading according to the standard,
recording - beep and tape recorder (tape recorder combined with RS-232*)
#7FFD - recording differences:
1) bit 4 - ROM0=TRDOS* 2) bit 5 - 256k expansion (3rd page of RAM),
read - port status
#3FFD - additional extensions - disabling ROM, alternative RAM pages (0-2),
byte per attribute, second extended screen, 2 colors per byte*
Read and write.
All other devices (card reader, sound, clock, keyboard and mouse, printer, etc.) -
through an expansion block (concept :) )
Further iron changes are stopped,
It's time to switch to software...