PC-01 Lviv

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PostPosted: 21 Dec 2023, 14:21 
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Joined: 07 Aug 2023, 11:28
Posts: 7
Location: Port Macquarie, Австралія
Вітання з Австралії.
У мене один львівський працює, але при завантаженні зависає, постійно прокручується "?SN" ... ніби застрягла клавіша [RETURN]
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File comment: ?SN syntax error
2023-12-21 22.09.14.jpeg
2023-12-21 22.09.14.jpeg [ 685.45 KiB | Viewed 2126 times ]
Я замінив клавіатуру на іншу львівську, і вона робить те саме, тому, можливо, проблема в головній платі.
Будь-які пропозиції? Дякую.

Бретт
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Greetings from Australia.
I have one Lviv working, however when it boots it is stuck with "?SN" scrolling constantly ... it's like the [RETURN] key is stuck.
I have swapped the keyboard with another Lviv and it does the same, so maybe issue is on the main board.
Any suggestions? Thanks.

Brett.

https://youtu.be/Y1WK0Pv9z6c


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File comment: keyboard
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PostPosted: 22 Dec 2023, 02:08 
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Joined: 13 Feb 2012, 15:32
Posts: 341
Location: Россия
Quote:
Greetings from Australia.
I have one Lviv working, however when it boots it is stuck with "?SN" scrolling constantly ... it's like the [RETURN] key is stuck.
I have swapped the keyboard with another Lviv and it does the same, so maybe issue is on the main board.
Any suggestions? Thanks.

Brett.

https://youtu.be/Y1WK0Pv9z6c
Добрый день !
видно что даже basic не грузится, видимо ошибка чтения ПЗУ.

Good afternoon !
it is clear that even BASIC does not load, apparently there is an error reading the ROM.


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PostPosted: 28 Dec 2023, 22:56 
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Joined: 07 Aug 2023, 11:28
Posts: 7
Location: Port Macquarie, Австралія
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Добрый день !
видно что даже basic не грузится, видимо ошибка чтения ПЗУ.

Good afternoon !
it is clear that even BASIC does not load, apparently there is an error reading the ROM.
Интересный! Спасибо, сначала проверю ПЗУ!

Interesting! Thanks, I'll check the ROM first!

Brett.


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PostPosted: 01 Jan 2024, 13:17 
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Joined: 07 Aug 2023, 11:28
Posts: 7
Location: Port Macquarie, Австралія
Возможно, какой-то прогресс.
Я заметил, что выход O5 на D9 (декодер адреса A11/12/13) не работал. Итак заменил на 74LS138.
Теперь вообще нет загрузочного экрана - так что все еще проблема с ПЗУ... если я не усугубил ситуацию :roll:
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YouTube ... https://youtu.be/6wfWRgmxLKo
-----------------
Maybe some progress.
I noticed that output O5 on D9 (A11/12/13 address decoder) wasn't working. So replaced with 74LS138.
Now no boot screen at all - so still ROM problem ... if I haven't made things worse :roll:

Brett.


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