How to change the FS-A1ST Disk-ROM ?

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By gdx

Enlighted (5996)

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31-10-2022, 09:55

Hello the hack enthusiasts,

I'm looking to replace the Disk-ROM of my FS-A1ST by that from the FS-A1GT because this one seems a little bugged. Someone can help me ?
I know the ROMs are bundled into one big ROM. So I just need to know if a compatible ROM can be found and how to write in it.

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By Louthrax

Prophet (2435)

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31-10-2022, 11:45

I'm curious: what are the problems you noticed with the FA-A1ST ROM ?

By gdx

Enlighted (5996)

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31-10-2022, 12:11

This bug seems to occur only on the FS-A1ST. On OpenMSX, I replaced the FS-A1ST Disk-ROM with the FS-A1GT one. It solves the problem. So the problem comes from the FS-A1ST Disk-ROM.

By sdsnatcher73

Prophet (3808)

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01-11-2022, 06:08

I wonder if it was already fixed in later revisions of A1ST. I am quite sure my Game Master 2 starts fine on my A1ST. What revision do you have?

By gdx

Enlighted (5996)

gdx's picture

01-11-2022, 09:31

How do we know it?

sdsnatcher wrote:

I am quite sure my Game Master 2 starts fine on my A1ST.

Please try it because il doesn't work also on emulators. Also check that the battery is not empty.

By sdsnatcher73

Prophet (3808)

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01-11-2022, 13:04

Just tested both my GM2 carts (working battery) on my C and D revision FS-A1ST and both machines start the GM2 fine.

By gdx

Enlighted (5996)

gdx's picture

01-11-2022, 15:43

You didn't say how to know to revision.
What is the SHA1 of your GM2 ROM?

By sdsnatcher73

Prophet (3808)

sdsnatcher73's picture

01-11-2022, 18:02

The revision is in the serial number of the machine. So for instance 0LNMB09305 the last character indicates revision (in this case B).

It is very likely this issue was detected during release of A revision in the Japanese market and fixed in B revision (and later ones obviously).

By gdx

Enlighted (5996)

gdx's picture

02-11-2022, 00:24

The serial number is almost erased but it starts with "1BNMD". So I have a D revision like you. oO Mars2000 modifed the wiki a bit too quickly.
Can you also copy your Disk-ROM?

By sdsnatcher73

Prophet (3808)

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02-11-2022, 07:22

Here is the disk ROM from my revision C and D (identical).

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