Сборка Пентагон 128к

[andy150677]

Я правильно понял, клавиатура работает, только в бейсик 128 не попадает? Проверил, в шаблоне диод на шелкографии исправлен, в альбоме ошибка, он не правильно нарисован, на форуме уже не помню где, у кого-то была похожая проблема из-за этого диода..

Интересно Завтра посмотрю, уже не помню как именно я его установил.
Но проблема немного другая, я описывал уже: http://zx.pk.ru/showpost.php?p=558517&postcount=383
Там может не совсем понятно, просто в процессе ковыряний пришел к выводу, что в ОЗУ появляется мусор при работе в 128-м режиме

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[zorel]

andy150677, на плате пентагона, переходные отверстия не закрыты маской, возможно не в то отверстие запаяна какая нибудь деталь, например блокировочный конденсатор, садит какой нибудь сигнал на массу? Было бы фото собранной платы, можно было бы посмотреть, проверить.

[andy150677]

andy150677, на плате пентагона, переходные отверстия не закрыты маской, возможно не в то отверстие запаяна какая нибудь деталь, например блокировочный конденсатор? Было бы фото собранной платы, можно было бы посмотреть, проверить.

Фотку сделаю завтра. Вроде сам все перепроверял, тоже такая мысль была поначалу...

[Shockwav3]

Shockwav3, zorel says that 1st pins of 41256 must be connected to ground because IC 41256 corresponds to КР565РУ7 and pin 1 is address input. And he is absolutely right, КР565РУ5 is analogical to 4164. But I have exactly the same problem and don't know how to solve it (I've connected 1st pins to GND). My Pentagon works properly in 48K Basic, but crashes in 30-40 seconds after restart in 128K mode like yours (also with junk on the screen). I've asked allready about this issue, but nobody know how to fix it. Now I want to install ICs soviet КР565РУ7 instead of 41256. I don't have any more ideas.

I've done that by now, doesn't seem to change anything

[zorel]

I've done that by now, doesn't seem to change anything

The board revision in 2011, there is an error, not connected path. You correct it?



If possible, you need to check how some RAM test.

[Shockwav3]

The board revision in 2011, there is an error, not connected path. You correct it?



If possible, you need to check how some RAM test.

Yes, I've corrected that one. About checking the RAM, I've pretty much counterswapped all RAMs I have - no improvement there either.

[Shockwav3]

Another problem:
RGB Video doesn't seem to sync correctly (used composite so far) - here's a video so you can see what's wrong. http://www.youtube.com/watch?v=RmKQC...ature=youtu.be

What should be the value of R16? I've seen pretty much anything from 160-1000 Ohms (I'm using 160ohms). Same goes for the quarz Q1, depending on which scheme I use I get values 14Mhz (which I used) or 14.3Mhz

[andy150677]

I've done that by now, doesn't seem to change anything

Shockwav3, does yous Pentagon work properly in 48K mode or not? And did you try to install RAM КР565РУ7? I just want to understand - we have the same fault or different.

What should be the value of R16? I've seen pretty much anything from 160-1000 Ohms (I'm using 160ohms). Same goes for the quarz Q1, depending on which scheme I use I get values 14Mhz (which I used) or 14.3Mhz

I've install R16=160 ohms, Q1=14MHz and my sync works fine. What scheme do you use to connect Pentagon to TV?

[Shockwav3]

@andy150677: it works "mostly fine" in 48k mode, but still crashes there occasionally. TRDOS usually crashes within seconds. I'll try to get a RAM Test ROM soon. Sadly I only have 41256 RAMs to test, but will try to order 4164 ones if the problem persists.

Scheme for connecting the Pentagon to my TV is just the ordinary one, R, G, B on the corresponding pins + Sync on pin16 (blanking), ground for r_ground, g_ground, b_ground, shield and blanking (pin18). Didn't use any amplification as shown in pentagon.pdf (470ohm -> kt315b/bc547 -> 75ohm -> scart socket for R, G, B & Sync), since it didn't make a difference on my TV

[zorel]

Shockwav3, And if you connect to another TV, the picture is the same?
There is an oscilloscope or frequency? Need to see what's on the input - output meter DD11, DD12,

If it's a manual for the assembly, transfer to translate.google.com.ua