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fix zeroize protection simulation in lieu of proper dongle dump.

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This commit is contained in:
Bryan McPhail 2010-01-05 22:50:03 +00:00
parent 3ce444c242
commit 5f80816033
1 changed files with 4 additions and 1 deletions
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5
src/mame/machine/decocass.c
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@ -1679,12 +1679,15 @@ MACHINE_RESET( czeroize )
/*
* FIXME: remove if the original ROM is available.
* The Zeroize 6502 code at 0x3707 issues LODCTRS with 0x8a,
* and expects to read 0x18 from 0x08a0 ff. within 7 bytes.
* and expects to read 0x18 from 0x08a0 ff. within 7 bytes
* and 0xf7 from 0x8a1 (which 0xd is subtracted from presumably in order
* to form a NOP of 0xea).
* This hack seems to be sufficient to get around
* the missing dongle ROM contents and play the game.
*/
memset(mem, 0x00, 0x1000);
mem[0x08a0] = 0x18;
mem[0x08a1] = 0xf7;
}
/***************************************************************************