EGA monitor and Pentagon 48
ZXNet echo conference «hardware.zx»
Hello, All
I decided to try connecting my Pentagon 48 (upgraded to 128) to EGA
monitor.
Therefore, an accurate connection algorithm is required.
After surfing the forum I found a few phrases:
> Ronin: [http://zx.pk.ru/showpost.php?p=17776&postcount=11]
> 1). ground - 1.2pin/EGA.
> 2). D44 (RGBY) in inversion mode - at 2,12,9,5pin log.1 - then at
> the output will be non-inverted colors.
> 3). RGBY are served according to 3,4,5,6pin/EGA.
> 4). KSI(+) is taken from 8pin/D6 (from there it goes to the RC-chain of INT and
> to the KT315 emitter where it interferes with the SSI).
> 5). KSI(+) - 9pin/EGA.
> 6). SSI(+): emitter of the mentioned KT315, on which it interferes
> sync mixture (which is connected by a collector to 2pin/D14 and further to
> output) cut off from the CSI and ground. on 1pin/D14 d.b. log.1 - and c
> output 3pin/D14 remove our SSI(+).
> 7). SSI(+) - 8pin/EGA.
> -------
> the scheme was invented theoretically, so glitches are not excluded
>
> CHRV: [http://zx.pk.ru/showpost.php?p=15114&postcount=8]> EGAs cling to the Spectrum without any problems, but we must take into account that EGA has
> digital inputs and separate synchronization. Those. needs to be removed
> analog part of the circuit (or better yet, attach it on the second floor to the digital one
> exit one more mikruhu). And delve into the diagram to find where it is formed
> synchronization signals, perhaps a frame signal will be needed
> invert. The work, in short, is creative
but I would like to listen to those who have already connected such a monitor to the Pentagon -
what recommendations will there be?
here [http://almaz.homesait.net/upload/Pent48SCHH1.gif] diagram from Pentagon 48k
(225kb)
Hello Almaz
I have a Pentagon-128 connected to an EGA monitor. Connection diagrams already
I don’t remember, but I took color signals directly from the digital outputs of the multiplexers. More
I had to adjust the settings on every monitor I came across
frame rates and geometry, because The frame rate in the Spectrum is still not 60, but 50 Hz.
Press RESET immediately, Almaz!
On Wed, 09 Nov 05 17:36:13 +0300, Almaz wrote:
Read carefully - everything is said here:
>> CHRV: [http://zx.pk.ru/showpost.php?p=15114&postcount=8]
>> EGA clings to the Spectrum without any problems, but we must take into account that EGA
^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> digital inputs and separate synchronization. Those. needs to be removed
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> analog part of the circuit (or better yet, attach it on the second floor to the digital one
>> exit one more mikruhu). And delve into the diagram to find where it is formed
>> synchronization signals, perhaps a frame signal will be needed
>> invert. The work, in short, is creative
A> but I would like to listen to those who have already connected such a monitor to
A> to the Pentagon - what recommendations will there be?
In this case, you were in the wrong eha or forum, I don’t know how now
right.
Hello, Prusak
Pru> I have a Pentagon-128 connected to an EGA monitor. Connection diagrams
Pru> I don’t remember exactly, but I took color signals directly from the digital outputs
Pru> multiplexers. I also had to in every monitor that came to me
Pru> hit, twist the frame rate settings and geometry, because. personnel
Pru> in the Spectrum it’s still not 60, but 50 Hz.
Well, or don’t turn it and put quartz 14.3... or 14.7... instead of 14 - it will be
slightly turbocharged computer :).
Hello Almaz
Today I connected the monitor using the Ronin algorithm.
When connecting, it turned out that D44 was missing on the board, and instead of D43 (LA3)
soldered 155LI1. The emitter of the transistor has already been cut off and placed on
tire
When applying CSI(+) with 8pin/D6, it turned out that this leads to a stoppage of work
programs (that is, we disconnect the KSI wire - the line moves, we connect -
freezes in place). At random I discovered that if the KSI is placed on the 4th leg DD17
(LA3) then everything becomes wonderful.
Now about the result. Everything shows perfectly and does not twitch. One but (even two):
1. The colors are completely different.
Picture: http://almaz.homesait.net/upload/zxinvers.jpg
2. On the screen in games and demos there are squares with lighter colors.
Unfortunately I can't show you.
Question:
what to do?
Hello Almaz
"lighter" :) in the sense of black & gray :) if it's critical, you can do
a circuit that turns gray into black. if not, you can leave it as is.
colors - make a border 1, 2, 4 and see who you mixed up with whom (R, G, B).
Hello Ronin
so you can see that red and green need to be changed
Hello, Vladimir Kladov
Vla> so you can see that red and green need to be changed
And I see from the skinshot that now GBR is connected instead of RGB, that is, none
The signal is not in its place :)
Hello Almaz
Alm> 2. On the screen in games and demos there are squares with more
Alm> with light colors. Unfortunately I can’t show it.
This is BLACK with BRIGHT turned on. Normally black color and black with increased color
brightness on the screen look the same, when connected to CGA and EGA monitors
This is the effect that occurs. It can be treated with just one small logic chip.
Hello, CityAceE
Cit> Can be treated with just one small logic chip.
Can you be more specific? preferably a diagram.
and why do we even need these types of black if they are supposed to look the same?
Hello Almaz
Alm> can you be more specific? preferably a diagram.
The circuit got stuck somewhere. But the gist is that signals are sent to the microcircuit
R, G, B and BRIGHT and if there is 0 on pins R, G and B, then 0 will also be on
output BRIGHT, even if it is at input 1. The circuit is elementary - 4 elements (two
input and inverted output) the microcircuits are arranged together in a special way
way.
Alm> and why are these types of black needed at all if they are supposed to look
Alm> the same?
They are not needed, the specified types of monitors simply do not reproduce them correctly.
Hello Ronin
Ron> you can fit into one body - KP7 or something - I don’t remember right now, it’s necessary
Ron> take a reference book and compose.
It is also possible on KP7:
File: zx_ega2.png http://zx.pk.ru/attachment.php?attachmentid=1942
Hello Almaz
Alm> can you be more specific? preferably a diagram.
Here is one of the scheme options:
File: zx_ega.png http://zx.pk.ru/attachment.php?attachmentid=1941
Hello, CityAceE
Cit> And I see from the skinshot that now GBR is connected instead of RGB, that is
Cit> not a single signal is in its place :)
here. I was just too lazy to figure it out from the screenshot. just look at the colors
1,2,4 or mattress by break+reset.
for light black - just connect it as is for now. that's later.
The logic is this - R, G, B are fed to LL1 (total 2 elements) and their output is to LL1
(1 more element), the second input of which is supplied to Y (brightness) and its output to Y
monitor. such a scheme is simple, the elements are simple (especially if there are free
on the board). you can fit it into one body - KP7 or something - I don’t remember right now, it’s necessary
take a reference book and compose.
PS // ah, I already drew Caro here ;)
Hello caro
That's it, I figured out the colors - I found the correct positions of the wires by elimination.
(for some reason it didn’t match the diagram).
As for BRIGHT, I just put it on the bus, then everything is fine, but the BASIC team
BRIGHT 1 doesn't work then. I'll try with the diagrams.
Here is a screenshot of this screen:
http://almaz.homesait.net/upload/DSCF0009.JPG (360kb)
As far as I understand, after applying the BRIGHT 1 scheme it will work, but as
necessary?
Hello Ronin
Ron> you can fit into one body - KP7 or something
I remember exactly the circuit that fits into one package of small logic. There's one of
the key points are this: one of the four elements was used simply as
inverter (both inputs were connected to each other and one common one was supplied to them
signal).
Hello caro
Couldn't the diagram look something like this?
File: CXEMA.GIF http://zx.pk.ru/attachment.php?attachmentid=1952
Hello, CityAceE
Cit> Couldn't the diagram look something like this?
If all the elements are from the same body, no, it couldn’t.
In this circuit, if R and G are applied to LE1 (2OR-NOT), all other elements
install LA3 (2I-HE) from the housing, adding another one at the output as an inverter, that’s all
will work.
File: CXEMA2.png http://zx.pk.ru/attachment.php?attachmentid=1953
Hello, CityAceE
Cit> I remember exactly the circuit that fits into one package of small logic. There
Cit> one of the key points is this: one of the four elements
Cit> was used simply as an inverter (both inputs were connected to each other and
Cit> they received one common signal).
If the main circuit has an inverse BRIGHT (/Y), then you can get by with one
body LE1.
Either with one LH2 (LH5) housing, due to connection according to the mounting OR circuit, but
this option is not very good, since it requires 3 more pull-up resistors,
about 470 Ohms (for the formation of normal fronts).
File: zx_ega3.png http://zx.pk.ru/attachment.php?attachmentid=1950
File: zx_ega4.png http://zx.pk.ru/attachment.php?attachmentid=1951
Hello, CityAceE
Cit> I remember exactly the circuit that fits into one package of small logic. There
Cit> one of the key points is this: one of the four elements
Cit> was used simply as an inverter (both inputs were connected to each other and
Cit> they received one common signal).
If the main circuit has an inverse BRIGHT, you can get by with one LE1 housing.
Hello caro
Ronin
caro
Thank you, I connected BRIGHT processing today.
True, instead of KP7 I installed 155KP5 - it has fewer pins.
Only for some reason when I do BRIGHT 1 the screen becomes darker than the border.
Hello Almaz
Today I noticed one glitch:
The cursor does not blink.
In BASIC 48, with the FLASH 1 command, instead of flickering, the window is simply black.
I don’t think this is due to modifications. As far as I remember there is a cursor on the TV
didn't flicker either.
What could be the problem?
Hello Almaz
Start with a “flickering” transyuk (probably some kind of transyuk or condyuk
fell off), and then continue according to the diagram (maybe the break is lurking somewhere).
Hello fan
I have three schemes.
Two of them 1 and 2 are similar, but 3 is slightly different from 1 (1 is also not
Part designations are indicated).
If you or anyone else can figure out what the difference is, what these different
Pentagon options will be good.
I posted all three diagrams here [http://almaz.homesait.net/upload/pentagon48k.rar]
- 1.6Mb (I’ll delete it in a couple of days).
Hello Almaz
OK, thank you!
Slito.
Hello fan
FLASH fixed it. Indeed, it turned out that the capacitor was poorly soldered.
Hello Almaz
Congratulations.
ZY On other computers, the frequency is usually taken from the last (in the chain) counter
and is passed through another counter. And no air conditioners are scary :)
Z.Z.Y. My air conditioner usually fell off on the internet after my computer crashed. Like
the capacity was lost :v2_lol: and the keyboard was cut off ;)