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Naomi/AW: Enforce read-only status of PowerVR ID registers.

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This commit is contained in:
R. Belmont 2009-09-08 01:09:30 +00:00
parent 32e309ebb4
commit 26d54c2395
1 changed files with 7 additions and 1 deletions
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8
src/mame/video/dc.c
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@ -1014,7 +1014,13 @@ WRITE64_HANDLER( pvr_ta_w )
reg = decode_reg_64(offset, mem_mask, &shift);
dat = (UINT32)(data >> shift);
old = pvrta_regs[reg];
pvrta_regs[reg] = dat; // 5f8000+reg*4=dat
// Dreamcast BIOS attempts to set PVRID to zero and then dies
// if it succeeds. Don't allow.
if ((reg != PVRID) && (reg != REVISION))
{
pvrta_regs[reg] = dat; // 5f8000+reg*4=dat
}
switch (reg)
{