Corrupt Kanji on Panasonic FS-A1FM firmware???

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By gdx

Enlighted (5317)

gdx's picture

09-01-2022, 13:16

sdsnatcher73 wrote:

Anything I missed?

Only to answer this question: what value does the OUT&H40,8: PRINT INP(&h40) return on your real FS-A1FM, and also OUT&H40,&HF7: PRINT INP(&h40)?

The FS-CM1 modem ROM seems to be the same or similar as the FS-A1FM modem ROM. It seems use some addresses between 7FC0h-7FCFh.

By Manuel

Ascended (18694)

Manuel's picture

09-01-2022, 13:53

Another note: apparently Wouter already discovered almost 13 years ago that the openMSX implementation only used the first 1MB of the existing dump, see https://github.com/openMSX/openMSX/commit/5bfbc739127c8683f6...

In any case, is there any schematic of this machine available?

By sdsnatcher73

Prophet (2953)

sdsnatcher73's picture

09-01-2022, 19:30

I tried and both times the value printed is 255.

By sdsnatcher73

Prophet (2953)

sdsnatcher73's picture

23-01-2022, 08:16

Wouldn’t we be able to deduce the exact MASK ROM content from existing knowledge of the Panasonic Mapper in slot 3-3. I mean this mapper is used in the 2+ And tR machines. In many ways these machines were based on the work Panasonic did in the A1FM. If we dump these machines in the same way as I did on the FM and compare their results to known good mask rom dumps of the same machines we could extrapolate the FM ROM, right?

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