About improvements and errors of Lenigrad-1
ZXNet echo conference «hardware.zx»
Hello, y-dmitry
There are several old ZX-Reviews before 95 - this topic is very common there
studied. When I scan it I'll post it.
Hello, All
Good day to everyone present!
Everyone probably remembers or knows how popular Leningrad-1 was.
My son and I had an idea to assemble this model. Fortunately, with your guys' help already
I got some information. There were also clean boards in the bins
once addicted people. Previously, during a period of widespread shortages, we purchased
even microcircuits are in stock, sometimes without even understanding what we need them for in the future
will be needed.
And because we firmly decided to restore this clone, an idea appeared
systematize information about errors and improvements to this clone model. Possibly
one of the newcomers or one of us “old men” will undertake to repeat this feat, but
One thing is clear: the Spectrum is not just a computer (you can do one without thinking
buy), its value lies in the fact that it gives us the opportunity to create,
invent, think, COMMUNICATE, and just don’t lose your brain.
If there is any information (history of creation, errors and their correction,
improvements, etc.), write, and I, in turn, will try to systematize everything
and post it for public use.
Best regards, Dmitry.
Hello, Jukov
Everything is so systematized
http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm
Every perversion with IR9 remains, but someone has already posted this on the forum. However
everything works the first time. Better deal with connecting SRAM instead
DRAM.
Hello fan
fan> Everything is already systematized
fan> http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm
fan>
fan> Every perversion with IR9 remains, but someone already posted it on
fan> forum. However, everything works the first time. Better get busy
fan> by connecting SRAM instead of DRAM .
Thanks for the advice.
The search for information about the first Leningrad began with this resource. Why am I
I am grateful to the author of the site.
But after rummaging through the materials, I found some improvements, and the desire appeared
collect everything possible and systematize it. Let's start assembling this model
in two weeks, you'll need everything ever published or
thoughts written on the edge of a newspaper. Then we’ll start thinking about
empowerment.
That's why I ask you to help me collect information (if this is real) about errors
(their corrections), improvements, etc. to this model.
Hello, Jukov
Juk> There are several old ZX-Reviews before 95 - this topic is very common there
Juk> studied. When I scan it I'll post it.
Good day! Don't forget about me. I see that you are the only one who responded to
my request. Thank you in advance.
Hello, y-dmitry
ydm> Good day! Don't forget about me. I see that only you
ydm> responded to my request. Thank you in advance.
I'll work on it on the weekend
Hello, Jukov
Juk> Expansion scheme up to 1MB and connection of shadow ROM from ZX-Review94/6.
Juk> The expansion scheme to 128K was already on the forum in the topic “I can’t finish
Juk> 128K". Other improvements are in the ZX-Review 91-93 on the website
Juk> http://trd.speccy.cz/
Thank you! Everything is great!
Hello, y-dmitry
Well, this is a composite aka Leningrad with corrected glitches, but not
I remember if the diagram flew to him. If anyone remembers, point me to it ;)
Hello, y-dmitry
By the way, there is a disguised SZ label on the board ;) And on both sides
(upper left corner).
Hello fan
fan> By the way, there is a disguised SZ label on the board ;) And with
fan> on both sides (upper left corner).
Class
Do you think it's Zack Zonov? :rolleyes:
Hello, y-dmitry
I'm hinting at this ;)
By the way, I remembered (if I haven’t found it yet), it was already posted in some topic
photo COMPOSIT (without the E at the end, and without the SZ label). If there is no installation,
for the first time it will be enough. If this photo is not found, I’ll upload it to my
website
Hello, y-dmitry
ydm> Do you think this is Zach Zonov? :rolleyes:
It seems that yes. Later, Scorpio also had such a sign (Scorpion ZS 256).
I also have the letters NW drawn on the scorpion board with a red ballpoint
with a pen. Zonov probably did the painting with his own hand: v2_rolley
Hello, y-dmitry
I collected about 92 for this one in the year. I remember there with the formation of INT there were
problems.
Hello Costa
Yesterday I caught another variety of Leningradka-1. Look, maybe someone, what,
will say.
File: Plata2.rar http://zx.pk.ru/attachment.php?attachmentid=2885
File: Plata1.rar http://zx.pk.ru/attachment.php?attachmentid=2884
Hello, y-dmitry
ydm> Yesterday I caught another variety of Leningradka-1. Look, maybe
ydm> who will say what.
It looks like this is Leningrad at the beginning of its decline, so to speak, an anti-hemorrhoidal option
(I've wanted one like this for a long time ;)). Added holes for KT315 in case of absence
transjukovy assembly and it looks like the reader is made more pop. And the sound was pulled up to
video signals. The scheme from an ordinary Leningrad should fit almost
100%
Hello fan
Who can tell me why in Leningrad-1 they use KP14 instead of KP11 (D15-D18)?
Hello, y-dmitry
They only have inverted outputs, and where the data will be physically recorded is one
figs... The percentage and video will take what you need.
Hello fan
fan> It seems that mikruhi with inverse outputs are easier to cook up (like crystal
fan> is smaller) and the delay in them is less (since there is no need to invert) but I don’t
fan> I’m sure of this (there are no similar reference books).
I can lie, but about 11 years ago, when I assembled my L-1, a printout came with it,
in which there was a mention that instead of KP11 it is better to install KP14, just
due to lower signal delays... Otherwise, there may be problems with the RAM.
Unfortunately, I cannot confirm or refute my memories, because
I haven’t come across this printout for 6 years now... :(
Hello fan
fan> They only have inverse outputs, and where they will be physically recorded
fan> the data is one fig... The percentage and video will take what you need.
I just noticed that where KP11 should be located, in almost all assembled
the boards cost KP14. It is difficult to explain this by a shortage of parts.
So far I have not found an explanation in the literature.
Hello fan
fan> There are KP12 and KP11. I posted the diagram and installation like spensor. Quite
fan> good quality. Now I'll try to scrape off my version
fan> definitely of excellent quality (maybe there are ten differences ;) )
It'll be great. Thank you.
Spensor has little sharpness, some characters merge.
Hello fan
fan> Hmm, on the assembly and diagram from my L2, the small circuits are numbered by
fan> own system %) But fortunately I found another set with everything
fan> numbered like spensora :D This is probably the standard.
fan>
fan> http://sblive.narod.ru/ZX-Spectrum/Leningrad2/Leningrad2.htm
Cool!
This is exactly the scheme according to which I assembled Leningrad-2 in 1990-91.
It brought me to tears... :v2_wink:
P.S. By the way, you have a more complete signet and a clear diagram. Thank you.
Hello, y-dmitry
There are KP12 and KP11. I posted the diagram and installation like spensor. Quite good
quality Now I’ll try to get my version, it’s definitely excellent
quality (perhaps there are ten differences ;) )
Hello, y-dmitry
Hmm, on the assembly and diagram from my L2, the small circuits are numbered according to their own
system%) But fortunately I found another set where everything is like spensora
numbered :D This is probably the standard.
http://sblive.narod.ru/ZX-Spectrum/Leningrad2/Leningrad2.htm
Hello, y-dmitry
There are suspicions that they were simply cheaper. You need a single reference book
look (where there is a circuit diagram and other redundant information).
It seems that mikruhi with inverse outputs are easier to cook (like smaller crystals) and
the delays in them are lower (since there is no need to invert) but I’m not sure about this (no
similar reference books).
There is also a suspicion that it was just stupidly ripped off from one diagram and ended up like that
write, while others continued to repeat without going into detail.
Gee :) I went into the bins and found four pieces of KP14 torn from the last one
Leningrad%) and in my first Leningrad there were exactly KP11. Now on my own
I wonder where this fashion came from :P
Hello fan
fan> There are suspicions that they were simply cheaper. It is necessary in a single way
fan> look at the reference book (where there is a circuit equivalent and other
fan> redundant information) . It seems that mikruhi with inverse outputs are easier
fan> cook (like smaller crystals) and there are less delays in them (since it is not necessary
fan> invert) but I'm not sure about this (there are no similar reference books).
fan>
fan> There is also a suspicion that this was just stupidly ripped off from one circuit and
fan> they began to write, but others continued without going into detail
fan> repeat .
fan>
fan> Gee :) climbed into the bins and found four pieces of KP14 torn out
fan> last Leningrad%) and in my first Leningrad there were exactly KP11
fan> . Now I’m wondering where this fashion came from :P
I wonder how it was implemented in the 2nd Leningrad? By the way, don't you have it lying around?
good wiring diagram for it. And what is on the Internet is of terrible quality, at least
take it and redraw it.
:v2_conf3: do something.
Hello jdigreze
2 jdigreze
This is already interesting. But I’m not even on any diagrams (four of them, if not more)
I don’t see these KP14 classic Leningrad:\n
2 y-dmitry
Please post here links to diagrams where KP14s are used.
Hello fan
fan> 2 jdigreze
fan>
fan> This is already interesting. But I’m not even on any diagram (about four if not
fan> no more) classic Leningrad I don’t see these KP14:
fan>
fan> 2 y-dmitry
fan> Please post here links to diagrams where KP14s are used.
I didn’t prepare the links, but in all (almost) screenshots, if you look closely, it’s noticeable.
Fan, I found a mistake in Composite. Connected to the Sync signal, it is negative on the board
closed.
I decided to redraw both the editing and the principle. If there is anywhere else
a clear Composite diagram (or any of them, I’ll figure it out along the way) throw it on soap or
in PM. The installation is different from its native Leningrad. I still want to check if it's done
whether the improvements described in the press. I would be glad if you could tell me again what
pay close attention (i.e. which improvements are more important).
Your nm.ru is still buggy, as soon as it starts up, I’ll post the information, as promised.
File: Error in Compisite.JPG http://zx.pk.ru/attachment.php?attachmentid=2935
Hello, y-dmitry
ydm> I didn’t prepare the links, in all (almost) screenshots, if you look closely
ydm> this is noticeable.
Do you mean "in screenshots"? In photographs?
ydm> I decided to redraw both the installation and the principle. If there is anywhere
ydm> clearer Composite diagram (or any of them, I'll figure it out along the way)
ydm> send it to soap or in a personal message.
At the root of my ****.nm.ru there is a composite diagram, do you have the same one?
ydm> I would be glad if you could tell me again what to pay close attention to
ydm> attention (i.e. which improvements are more important).
Will you be collecting Leningrad or composite? %)
Everything worked for me anyway. Only when the appeal to the muses was on
there were all sorts of special effects on the curb and the speaker was also saying something, like
AY emulation :D
I also think there is little light with brains - for complete happiness it is recommended in
RAS gap push the shortcut to 330 ohms. Another option for stable operation is
raising the voltage up to 5.5V.
Oh yeah, I forgot to put this link on my website -
http://anklab.pirit.info/Press/RL/1994/08/index.html pages 10&11, there as
once one of the RAS delay options is described, etc.
And I remembered another cool moment - in my first Leningrad there was a screenwhat for shifted to the right, as it turned out this effect was caused by the installed
at nominal value in the clock generator! (tested on two
Leningrad).
Hello fan
fan> Do you mean “in screenshots”? In photographs ?
fan>
fan>
fan> At the root of my ****.nm.ru there is a composite diagram, do you have the same one?
fan>
fan>
fan> Will you be collecting Leningrad or composite? %)
fan> Everything worked for me anyway. Only when the appeal to the muses was ,
fan> there were all sorts of special effects on the curb and the speaker was also broadcasting something,
fan> supposedly emulation AY :D
fan> Also, in my opinion, there is little illumination with brains - for complete happiness
fan> it is recommended to push a 330 Ohm resistor into the RAS gap. More like
fan> option for stable operation is to raise the voltage up to 5.5V.
fan>
fan> Oh wow, I forgot to put this link on my website -
fan> http://anklab.pirit.info/Press/RL/1994/08/index.html 10&11 pages,
fan> there just one of the RAS delay options is described, etc.
fan>
fan> And I remembered another cool moment - in my first Leningradfan> the screen was shifted to the right, as it turned out, this effect was
fan> caused by an incorrectly set shortcut in the clock generator
fan> frequencies ! (tested in two Leningrads).
I will assemble Composite, because I have a board for it.
I have the same circuit, the quality leaves much to be desired, despite the fact that the installation
In general, let’s say, it’s less than informative.
I just finished drawing the montage. Drew directly on a copy of the (paper) board
from the parts side, so now there are no problems with installing small parts.
I’ll make it look divine (I’ll draw it on a PC), I’ll post it to you on nm.ru, let the people
enjoys. I'll redraw the principle, probably over the weekend (there are a lot of errors).
I also want to check the improvements and corrections that were published in the press.
I’ll also try to draw the signet, but not before I assemble and launch the Spectrum.
I would like to correct the mistakes at the same time.
Compared to the first version of Leningradka, there are enough changes in Composite. Even
somehow more interesting to collect.
So I will be glad for any help
Hello, y-dmitry
2 y-dmitry on the topic What was in the archives #Leningrad1_1.rar #Leningrad2.rar ???
Your personal message is full, so I’m posting it here.
Actually scans of Leningrad-1 boards (modified, i.e. some kind of intermediate
option), and Leningrad-2 are needed! I downloaded everything else.
And I also wanted to ask what devices you use for setting up and catching
bugs?
Hello fan
fan> 2 y-dmitry on the topic What was in the archives #Leningrad1_1.rar
fan> #Leningrad2.rar ???
fan> Your personal account is full, so I’m posting here.
fan> Actually scans of Leningrad-1 boards (modified, i.e. some
fan> intermediate option), and Leningrad-2 are needed! I downloaded everything else.
fan>
fan> And I also wanted to ask what devices you use to configure and
fan> catching bugs ?
Posted it again on nm.ru
And regarding the tools: eye, magnifying glass, scalpel, principle: v2_clapp:
I don’t know any new tools, I use them the old fashioned way.
Hello, y-dmitry
ydm> Posted it again on nm.ru
I can’t see it point blank :( Look through your web browser, please.
ZY It is better to name files only in English letters without spaces and without
exotic eroglyphs, some hosters cannot stomach it.
ydm> And on the issue of tools: eye, magnifying glass, scalpel, principle
ydm> I don’t know any new tools, I use them the old fashioned way.
And there are all sorts of oscillators, testers, etc. ?
Hello fan
fan> I don’t see it point-blank :( Look through your web browser, please.
fan> Z.Y. It is better to name files only in English letters without spaces and
fan> without exotic eroglyphs, some hosters can’t stomach it.
fan>
fan>
fan> And all sorts of oscillators, testers, etc. ?
I fixed everything.
Hello, y-dmitry
ydm> Corrected everything.
did you manage to download?
Hello, y-dmitry
Yes, yes, everything has downloaded.
Thank you for such rare specimens!
Hello fan
fan> Yes, yes, everything has downloaded.
fan> Thank you for such rare copies!
Glad it helped. I'll get something else soon.
I hope to assemble the Composite soon. The exact installation will be ready, the principle will be ready,
improvements (I'll try how they work), differences from Leningrad1 and photos
mounted board.
Hello fan
fan> Screw the extra address legs to the ground, the rest in accordance with
fan> pinout . Score with FFs. empty files with FFs are there -
fan> http://sblive.narod.ru/GameBoy/DualFlashProg/DualFlashProg.htm ,
fan> are screwed by simple gluing in Windows Commander.
Thank you.
those. Unhook the extra ones (compared to 2764) from +5 and screw them to the ground. How
then 27128 - tore A13 from +5 and screwed it to A13 of the processor and connected
CE with OE.
P.S. It’s a shame, everything seems to be fine, but “Malevich’s black square” is all there is to it.
Although the RAM test started.
Hello fan
fan> Screw the extra address legs to the ground, the rest in accordance with
fan> pinout . Score with FFs. empty files with FFs are there -
fan> http://sblive.narod.ru/GameBoy/DualFlashProg/DualFlashProg.htm ,
fan> are screwed by simple gluing in Windows Commander.
Following your advice, I screwed A14 (27 leg) to the body - it didn’t help. Maybe something else
there is, huh?
Hello, y-dmitry
ydm> But what about 27128 - they tore A13 from +5 and screwed it to A13
ydm> processor and connected CE to OE.
If this is a question, then I did not understand it)
ydm> P.S. It’s a shame, everything seems fine, but “Malevich’s black square” and
ydm> everything is here. Although the RAM test started.
There should be something like a chessboard. Or vertical familiar signs
black/white stripes. Perhaps a jamb with brains or multiplexers or something else
than... Without a closer look it will be difficult to understand.
ydm> Maybe there is something else, huh?
In ROM only bysik? The firmware was stretched to fit the entire ROM size (added
FF) ?
Is it read normally (coincides with the stretched firmware)?
What are the programming prohibition signals? (maybe this is a bug)
Hello fan
fan> If this is a question, then I didn’t understand it %)
fan>
fan>
fan> There should be something like a chessboard. Or vertical
fan> familiar black/white stripes. Perhaps a joint with brains or
fan> multiplexers or something else... It will be difficult to understand without an eye.
fan>
fan>
fan> In ROM there is only black? The firmware was stretched to fit the entire ROM size
fan> (extended FF) ?
fan> Is it read normally (matches the stretched firmware)?
fan> What are the programming prohibition signals? (possibly in this
fan> jamb)
I didn't understand anything... :sleep:
Hello, y-dmitry
ydm> Somewhere in the forum someone said that they need an RDROM signal circuit
ydm> redo. The question is that the diagrams of the signals W27E256 and 27C256
ydm> reading are identical, I can’t understand where to edit. Maybe it ran through
ydm> something. Help.
Of course, you need to look at the sampling scheme. Consider leg A14 in 27256 - this is a choice
the upper half of the ROM (upper 16K). What's in your lower 16K, BASIC?
In this case, fan has already told everything.
Hello, y-dmitry
ydm> but I don’t know what “programming prohibition signals” are, I do know
ydm> that the erasing and reprogramming voltage is 12 V.
Probably the leg to which 12V is supplied automatically is
prohibition/permission of programming. Is this not the first pin by chance? Maybe him
die on the ground (although this is most likely nonsense).
Did the ROM with the test appear on the screen?
ydm> P.S. I posted the book, download it - manual.djvu. Should I leave files on
ydm> website?
Let it lie around, we’ll erase it as space is needed.
Hello icebear
ice> Of course, you need to look at the sampling scheme. Consider leg A14 in 27256 - this
ice> selects the upper half of the ROM (upper 16K). What do you have in
ice> lower 16K, BASIC? In this case, the fan has already told you everything.
So I didn’t understand anything. If it's not difficult, please clarify in more detail.
Hello, y-dmitry
I dug up something, but haven’t checked it yet, leg 27 (A14) is generally hanging in the air, but
here is the 20th leg (CE) - to the “ground”. The circuit used an Intel P27256, while the descriptions for
I didn’t find it, but apparently the pinout matches, it’s probably all about the signal
SE.
As for reading data from ROM, they are read starting from address 0000F.
Hello, y-dmitry
ydm> /OE-Vpp(22). Well, the address foot is on the ground for now, but what to do with 22
ydm> with your foot?
and this is naturally on RDROM: smile:
Hello jdigreze
jdi> If you only have "48K ROM" then connect A14 to ground, but
jdi> provided that the firmware is “uploaded” from address 0000h, and not from 4000h. Otherwise
jdi> you will “snatch” bytes from nowhere :)
jdi>
jdi> /CE (20) plant on the ground.
jdi> Vpp (1) connect to +5V.
jdi> /OE (22) - to the /RDROM signal.
jdi>
jdi> A14 in Spectrum 48K, if BetaDisk is not connected, connect to ground.
jdi> In 128K this signal switches the firmware Basic 48K/Basic 128K, or
jdi> if BetaDisk is connected, then Basic 48K/TR-DOS signal is selected
jdi> BetaDisk'a...
Thanks for the tip, I'll check everything now. Is there any more connection information?
27512. The fact is that there is A15(1), /OE-Vpp(22). Well, the target foot is on the ground for now,
But what to do with the 22nd leg?
Thanks in advance.
Hello, CheburatoR
Forget about this winebond, the devil has possessed him ;)
Ras Intel works, so we leave it.
ZY Everything (IMHO) should work for reading and so, because (IMHO) this is a standard.
Most likely the animal is slightly injured and this manifests itself in a strange way. U
something strange happened to me, two completely identical chips behaved differently
differently on not very long trains, one of them did not want to write not
read while hanging on the train, the other didn’t care, he plowed both on the train and on
board....
Hello, jdigreze
http://zx.pk.ru/showthread.php?t=1621