Звуковая карта "ZXM-SoundCard"

[VELESOFT]

Собственно скоро новый год и хочется сделать себе подарок. Вот давно захотелось скрестить TFM от NedoPC и SAA1099 http://velesoft.speccy.cz/saa1099-cz.htm

Так что это скорее любительская поделка.
Плата расчитана под ZX-Bus шину(скорее Nemo Bus)
1. порты TFM теже как и у NedoPC;
2. порты SAA1099, FFh и 1FFh на запись, но доступ к ним может быть только при DOS/ =1 (неактивном TR-DOS)
3. Расширение шины по второму YM2203, пока не рисовал, думаю
4. На плате применяю мелкую ПЛИСу ATF1502 - для тренировки.

Итак, прилагаю схему. Бета так сказать.
Народ,если кому интересно обсудим ваши предложения по схемотехнике, да и так мысли.

Возгласы - типа это бредятина и т.д. оставьте при себе - мне пофиг.

Wow, cool sound card. Can you release schematic ?

It's my old similar project for ZX Spectrum machines:

Interface is connect to socket on original AY-3-8912 in ZX Spectrum/external interfaces.

Use programmable clock for each AY chip:
1.75xxx MHz for ZX mode
1 MHz for AMSTRAD CPC mode
2 MHz for ATARI ST mode
AY can be also disabled (0 MHz)

Clock for SAA1099 is also programmable.

All 3(first AY)+3(second AY)+6(SAA1099) channels are mixed in external sound mixer with ZX speaker output (for games with AY+SPEAKER support - as CHRONOS for example). It's 12 channels + speaker. Theoretically can be connect also second SAA1099 chip....

And what about reset SAA1099 chip ? This chip don't use reset pin. As correct way can be reset by software(using OUT instructions) or via disconnect and reconnect power supply.
Or is possible stop CLK input for SAA1099 chip, but this don't reset internal registers, only stop sound.

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[Mick]

Wow, cool sound card. Can you release schematic ?

Спасибо. Схема альфа версии в первом посте.
Thank you. The Scheme alpha to versions in the first post.

And what about reset SAA1099 chip ? This chip don't use reset pin. As correct way can be reset by software(using OUT instructions) or via disconnect and reconnect power supply.
Or is possible stop CLK input for SAA1099 chip, but this don't reset internal registers, only stop sound.

Об этом я не думал. Мне больше нравится идея с отключением питания.
About this I did not think. I more like the idea with disconnect and reconnect power supply.

I am sorry for my wrong english.

[VELESOFT]

Спасибо. Схема альфа версии в первом посте.
Thank you. The Scheme alpha to versions in the first post.

And switching ABC / ACB

- possibility disable TS (only one AY)
- possiility disable SAA1099
- possibility set both AY chips as write only (reading is dangerous on machines with internal AY chips = data collision). It's impossible connect to real ZX Spectrums. But exist way - add resistors between data lines on connector and data on card. As on my K-MOUSE interface:

Об этом я не думал. Мне больше нравится идея с отключением питания.
About this I did not think. I more like the idea with disconnect and reconnect power supply.

Yes, this is better. But 100% correct way is software reset (or CPLD write values to registers)

[Mick]

- possiility disable SAA1099

Согласен. Отключение чипа необходимо сделать.
Agree. Unhooking the chip necessary to do.

- possibility set both AY chips as write only (reading is dangerous on machines with internal AY chips = data collision). It's impossible connect to real ZX Spectrums.

При наличии карты, в установке внутреннего AY необходимости нет.
Я так думаю.
At presence of the card, in installation internal AY need no.
I so think.

But 100% correct way is software reset (or CPLD write values to registers)

Согласен, но в ATF1502 маловато ресурсов для реализации автоматического сброса SAA1099. И при том, что я в CPLD пока еще новичок.
Agree, but in ATF1502 not quite enough resource for realization of the automatic unset SAA1099. And under that I in CPLD so far beginner.