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argus: Add some info about the ROM checksum tests

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Dirk Best 2019-06-12 13:47:27 +02:00
parent d8110b3499
commit 9bb0c483bf
1 changed files with 15 additions and 0 deletions
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15
src/mame/drivers/argus.cpp
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@ -105,6 +105,21 @@ Note :
argus
valtric
- Information about the internal ROM tests (see also MT03219):
* argus: Checksum routine at $7fc9 (for banks at $7fc0). Checksum is a
simple sum of the contents. Our dump gives a result of 0x95 while the
game expects 0x9b, therefore it displays a checksum error. Checksums for
the banked ROMs match.
* valtric: Checksum routine at $987c (for banks at $f000). Checksum is a
XOR over the contents. The expected checksums are stored in ROM vt_06.bin
starting at $d000 (main ROM first, then banks). For our dump, the
expected checksums are all 0x00, but the calculated checksums differ,
therefore displays a checksum error for all ROMs. This has been validated
on real hardware to also fail there.
* butasan: Checksum routine is at $e0a8 (for banks at $ec74). Checksum is a
simple sum over the contents. The test seems to be broken (or hacked) as
it will only fail when the checksum is exactly 0x00.
Known issues :
===============