T7766A in Sanyo MPC-2

Por Manuel

Ascended (15369)

Imagen del Manuel

28-08-2016, 08:48

Hi,

Check http://www.ebay.com/itm/322242730344?ssPageName=STRK:MESELX:...
It's the PCB of a Sanyo MPC-2 and shows a T7766A chip. Any idea what it is? I couldn't find anything about it and the Wiki article doesn't mention it either.
It's from this auction: http://www.ebay.com/itm/322242730344

Perhaps user pmack can help us a bit?

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Por NYYRIKKI

Enlighted (5270)

Imagen del NYYRIKKI

28-08-2016, 09:25

PPI?

Por maxis

Champion (512)

Imagen del maxis

28-08-2016, 13:11

T7766A is GI's AY-3-8910(A) pin-to-pin compatible knock off from Toshiba...

I wonder how it sounds Wink

Por gdx

Prophet (2714)

Imagen del gdx

28-08-2016, 13:20

Confirmed, it's a AY-3-8910 clone. I added the picture in the Wiki. Now we can see the PCB with each PSG.

http://www.msx.org/wiki/Sanyo_MPC-2

Por tvalenca

Paladin (728)

Imagen del tvalenca

03-01-2019, 18:18

Sorry for ressurecting such old thread but:

If Toshiba made its own PSG clone (like Yamaha did) and Yamaha included its PSG clone into Yamaha made MSX Engines, WHY DIDN'T Toshiba included T7766A on its MSX Engines?

In fact, it is most likely true with T7937 and T9769 engines and I am inclined to mention this on its wiki articles.

Por Manuel

Ascended (15369)

Imagen del Manuel

03-01-2019, 19:30

You shouldn't put stuff on the Wiki as if they are facts if it's only a guess. If you add it and you're not sure, please mention that, so people won't use that information as if it was a fact, but may start help to investigate it further.

Por mars2000you

Enlighted (5468)

Imagen del mars2000you

04-01-2019, 01:03

It seems to be indirectly confirmed by this document: https://img.atwikiimg.com/www34.atwiki.jp/matomerutokoro/att...

According this Japanese site https://www34.atwiki.jp/matomerutokoro/pages/102.html, the above document is "東芝 ゲートアレイ マクロセルの情報(MSX-ENGINEなどに使用されたLSIマクロセル)" = Information on Toshiba Gate Array Macrocell (LSI macrocell used for MSX - ENGINE etc).

Por sd_snatcher

Prophet (3002)

Imagen del sd_snatcher

04-01-2019, 01:13

@tvalenca

How do you know that the PSG inside the T7937 and T9769 isn't made by Toshiba?

The T7937 clearly has a VDP made by Toshiba inside it (revision2 of their VDP), so why wouldn't they do the same for the PSG?

Por sdsnatcher73

Champion (383)

Imagen del sdsnatcher73

04-01-2019, 03:06

mars2000you wrote:

It seems to be indirectly confirmed by this document: https://img.atwikiimg.com/www34.atwiki.jp/matomerutokoro/att...

According this Japanese site https://www34.atwiki.jp/matomerutokoro/pages/102.html, the above document is "東芝 ゲートアレイ マクロセルの情報(MSX-ENGINEなどに使用されたLSIマクロセル)" = Information on Toshiba Gate Array Macrocell (LSI macrocell used for MSX - ENGINE etc).

That confirms they could indeed have included the T7766 logic into their MSX-ENGINE chips T7937 and T9769. This is also mentioned on MSX-ENGINE on Wikipedia. Honestly it would not make sense if the PSG would not be in their MSX-ENGINE chips. A way to confirm would be to use process of elimination, look at the MSX computers with these chips and see if there is no other PSG chip on the main board. Or trace a signal path from the chips to the audio circuitry.

Por tvalenca

Paladin (728)

Imagen del tvalenca

04-01-2019, 13:59

sd_snatcher wrote:

@tvalenca

How do you know that the PSG inside the T7937 and T9769 isn't made by Toshiba?

The T7937 clearly has a VDP made by Toshiba inside it (revision2 of their VDP), so why wouldn't they do the same for the PSG?

Even if I jumped into a conclusion, That's exactly what I said: "T7937 MSX Engine already has T6950 VDP inside. And Yamaha engines already have YM2149 PSG inside it. So, T7937 AND T9769 engines have T7766A inside, not the AY-3-8910 neither another clone."

Actually, I am going to jump into another conclusion here based on the last two links posted here: The Z80 inside T7937 and T9769 engines aren't a regular Zilog Z80, but a TMP84C00A made by Toshiba.

EDIT: Also, the "Intel i8255 clone" is the TMP82C55A also made by Toshiba.

Por tvalenca

Paladin (728)

Imagen del tvalenca

04-01-2019, 13:50

sdsnatcher73 wrote:
mars2000you wrote:

It seems to be indirectly confirmed by this document: https://img.atwikiimg.com/www34.atwiki.jp/matomerutokoro/att...

According this Japanese site https://www34.atwiki.jp/matomerutokoro/pages/102.html, the above document is "東芝 ゲートアレイ マクロセルの情報(MSX-ENGINEなどに使用されたLSIマクロセル)" = Information on Toshiba Gate Array Macrocell (LSI macrocell used for MSX - ENGINE etc).

That confirms they could indeed have included the T7766 logic into their MSX-ENGINE chips T7937 and T9769. This is also mentioned on MSX-ENGINE on Wikipedia. Honestly it would not make sense if the PSG would not be in their MSX-ENGINE chips. A way to confirm would be to use process of elimination, look at the MSX computers with these chips and see if there is no other PSG chip on the main board. Or trace a signal path from the chips to the audio circuitry.

Sometimes I think the MSX-ENGINE article on Wikipedia is a copy inspired on our own MSX-Wiki article. Whatever we write here, they will accept as truth.