Dissecting the MSX Turbo-R exclusive chips

By sd_snatcher

Prophet (3499)

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07-05-2013, 01:51

The Visual6502 project dissects chips for preservation. They decapsulate them and take shots for preservation and to help reverse engineering.

I talked with them, and they got interested on the MSX exclusive chips. They prefer to use broken boards for that, provided that the chips are still in one piece.

So, is there anyone here who owns a dead MSX Turbo-R motherboard and woud like to donate it for that project? This could be a nice opportunity to at least give this board a last utility: to see inside the R800 and S1990 chips and discover their mysteries.

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By sd_snatcher

Prophet (3499)

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07-05-2013, 02:23

BTW, a dead Philips NMS-8255 would also be welcome, for its Sony superimpose chips: V7010, V7020, V7030 & V7040, and of course the S1985 and V9938.

Other broken boards containing the following chips will also be welcome:

- Texas Instruments TMS9918 VDP
- Toshiba T6950 VDP
- Toshiba T7937 (aka single-chip MSX-Engine)
- Hitachi HD64180 CPU
- Yamaha S3527 MSX-Engine
- Konami SCC
- Konami SCC+

And there's a non-MSX chip would be welcome too:

- Sega 315-5124 (Master System VDP)

By PingPong

Prophet (3885)

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07-05-2013, 11:55

I would add also v9938

By sd_snatcher

Prophet (3499)

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07-05-2013, 12:18

Take a carefully look on the list of the beginning, together with the NMS-8255 chips. Wink

By PingPong

Prophet (3885)

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07-05-2013, 19:39

sd_snatcher wrote:

Take a carefully look on the list of the beginning, together with the NMS-8255 chips. Wink

sorry, i was meaning v9958 ;-)

By SkyeWelse

Champion (471)

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07-05-2013, 23:30

Have you talked to Repair-Bas about this? I would imagine if anyone in the MSX Universe had spare or broken turboR parts, it'd be the Bas-Man.

And just out of curiosity, is this just for preservation purposes only or could this technically lead into this type of chip being manufactured again and possibly distributed / added to a One Chip MSX project in the future?

Edit: Also, which models of Hitachi MSX computers would have the following chip? - Hitachi HD64180 CPU I'm not sure if MisterSpin would feel up for this, but he does have a broken Hitcahi MB-H2 or MB-H21, I can't remember exactly which one, so if he has it it might not hurt to ask him. I know him personally, so as long as there is a good enough reason behind it, he might consider if he has one of these.

-Thomas

By Manuel

Ascended (18704)

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08-05-2013, 13:34

Note that a 8255 doesn't contain an S1985 Tongue

By sd_snatcher

Prophet (3499)

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08-05-2013, 15:14

@SkyeWelse

No, I don't have Repair-Bas' e-mail... But don't he always read the forums here?

It's both for preservation and for reverse engineering. It can help a lot to improve the implementations on FPGA, for example. It also can help emulators: for example, a lot of interesting details and the exact ROM tables could be obtained when The OPL2 and OPL3 got decapsulated.

The Hitachi HD64180 CPU is related to the Z180 and was used on two premium MSX2 models from JVC (then Victor): the HC-90 and HC-95. Those were the very first MSX machines with native turbo.

@Manuel

Ops, sorry: it's the S3527.

By SkyeWelse

Champion (471)

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08-05-2013, 16:15

sd_snatcher wrote:

No, I don't have Repair-Bas' e-mail... But don't he always read the forums here?

Here is Bas' Email: kornalijnslijper AT quicknet DOT nl.

Sounds like a definitely worthwhile project. I hope you all succeed in getting some of these!

-Thomas