First post, by tpowell.ca
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Hi guys,
So I've been reading up on the incredible variations of SC-55 ROM versions of the mk1 generation.
It would seem that for the most complete DOS compatibility of Sierra/Dynamix/Lucas games from the early to mid 90s era, the Control ROM version to go for is 1.21.
<1.20 supports Capital Tone Fallback but not General Midi instruments.
1.20 / 1.21 supports both Capital Tone Fallback and General Midi instruments.
2.00+ loses support for Capital Tone Fallback but retains General Midi instruments.
Does this sound correct?
Do we know what other changes there have been between ROMs 1.20 and 1.21? What else did ROM 2.00 bring?
Cloudschatze has stated that cross-compatibility is limited to the following:
CPU ROM v1.00 is only compatible with a v1.0x control ROM (only 1.00 exists)
CPU ROM v1.10 is only compatible with a v1.1x control ROM (only 1.10 exists)
CPU ROM v1.20 is only compatible with a v1.2x control ROM
CPU ROM v2.00 is only compatible with a v2.0x control ROM
It just so happens that I have a 1.20 Control ROM version unit, but how do I upgrade it?
The removable chip is identified as a ROLAND part, and the one I want is R15209363 (1.21).
Is this replaceable by a simple EEPROM chip? If so, which one is compatible?
Thank you
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