Hamlets insanely christmas quiz 2017

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By Pencioner

Scribe (1542)

Pencioner's picture

13-12-2017, 10:49

The big IC i suppose is ym2610 and the quartz is for 8MHz so i still think it is OPN (ok, OPNB) sound interface.

By Grauw

Ascended (10699)

Grauw's picture

13-12-2017, 11:53

Nice sleuthing, but no correct answers yet...

By ren

Paragon (1932)

ren's picture

13-12-2017, 12:30

YM2608 OPNA interface? (That would be pretty sweet.. Wink)

By ren

Paragon (1932)

ren's picture

13-12-2017, 12:20

Or it's an Y8950 on there...

By ren

Paragon (1932)

ren's picture

13-12-2017, 12:46

Anyway, 256K RAM on there, usable for both.. Wink

By Pencioner

Scribe (1542)

Pencioner's picture

13-12-2017, 12:43

YM2604?

By Grauw

Ascended (10699)

Grauw's picture

13-12-2017, 12:52

Pin-pon, ren takes the win!

Indeed, Pencioner did well linking the pin count and 8 MHz crystal to an OPN series chip, but the final clue was the 256K RAM chips in the top center of the board. The YM2608 OPNA supports sample RAM, whereas the YM2610 OPNB only supports ROM. It’s a prototype board that was sent to me by Leonard Oliveira, designed by him and Fábio Belavenuto (very grateful for that!).

I think that puts you ahead of Meits again! (And me on the same level as Johnny Hassink! For now...)

By ren

Paragon (1932)

ren's picture

13-12-2017, 13:05

Cool! Cool
I identified the TI SN74LS04N hex inverter as well (and know those exist now Wink)

Is that an own build proto board? (must read better - you described that in your posting) Some other day I thought to myself that like the only thing missing from MSX sound-expansion wise, was the OPNA - it's an awesome chip, got to learn some very awesome PC98 music this past year Wink

Where's that ribbon cable connected to?

By Grauw

Ascended (10699)

Grauw's picture

13-12-2017, 14:43

It’s connected to a cartridge that takes care of the I/O decoding logic, so the attached board can focus just on the sound chip.

By ren

Paragon (1932)

ren's picture

13-12-2017, 16:31

Thanks for the points Grauw!

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