Question about Roland SCC-1

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Question about Roland SCC-1

Postby retro games 100 » 2018-12-29 @ 11:04

What does the really big chip do? Is it a microcontroller?
Also, on this chip, there is a 3 digit alphanumeric code. Would this be a revision number? Is it similar to a BIOS?

Thanks a lot for any info! :)
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Re: Question about Roland SCC-1

Postby retro games 100 » 2018-12-30 @ 13:38

I've noticed something about this 3 digit code. If the first digit is 1, then I notice on some of the smaller chips, I see 91. I'm fairly sure this means 1991. If the first digit is 2, then I see 92 on some of the smaller chips. If the first digit is 3, then I see 93 on some of the smaller chips.

So, the first digit represent the year of manufacture:

1 = 1991
2 = 1992
3 = 1993

I've never seen a SCC-1 with the number 4. Also, in 1994, the MKII / SCC-1A/B was released.

Edit: now to try and figure out what the remaining 2 alphanumeric digits mean...
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Re: Question about Roland SCC-1

Postby suntac » 2019-1-08 @ 20:26

It is an MPU-401 on a chip (RJA-401-HB).
It contains the CPU, SRAM and logic array in a single package.
The chip on my SCC-1A is marked as 4B1.
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