Buy YMF278 | MSX Resource Center

Van denjhang

Rookie (30)

10-08-2021, 17:19

I can provide all the components needed for YMF278 and MoonSound.

Van sdsnatcher73

Prophet (3960)

10-08-2021, 17:30

The chip on that WozBlaster says YMF268-F… shouldn’t it be YMF278B-F?

Van Wierzbowsky

Guardian (3606)

10-08-2021, 20:23

According to some Japanese guys, the YMF268-F is also OPL4 chip that is pin-compatible with YMF278. But the differences are unknown. And there's no datasheet for this chip, at least I could not find any.

Van sdsnatcher73

Prophet (3960)

10-08-2021, 20:34

Oh wow, learned something again today thanks for sharing…

Van Pencioner

Scribe (1565)

10-08-2021, 20:42

Alexey wrote:

According to some Japanese guys, the YMF268-F is also OPL4 chip that is pin-compatible with YMF278. But the differences are unknown. And there's no datasheet for this chip, at least I could not find any.

may be differences are subtle enough like between OPP and OPM though (where OPP doesn't have a datasheet available in public as well)

Van Wierzbowsky

Guardian (3606)

10-08-2021, 22:10

On the boards with this chip I only saw 512kb of SRAM, maybe this is the difference - the chip is unable to use more than 512kb. This is just a guess though.

Van sdsnatcher73

Prophet (3960)

11-08-2021, 16:31

The CT1724 might indicate it was purpose built for Creative Technology for use on one of their Sound Blaster sound cards (who all have similar CT type numbers).

Van denjhang

Rookie (30)

15-08-2021, 07:24

Alexey wrote:

On the boards with this chip I only saw 512kb of SRAM, maybe this is the difference - the chip is unable to use more than 512kb. This is just a guess though.

It's not that YMF268 can only support 512KB SRAM. It's just that the SRAM pad of my PCB has been damaged, and the second 512KB SRAM cannot be soldered temporarily. To be honest, SRAM has many counterfeit or damaged chips, which led me to replace it many times.