Mercurial > repos > blastem
changeset 1152:ddbb61be6119
Fix to pass a couple more tests in VDPTEST.sms
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Wed, 04 Jan 2017 23:01:58 -0800 |
| parents | 681e8a13b261 |
| children | 2e3ad914bad3 |
| files | vdp.c |
| diffstat | 1 files changed, 2 insertions(+), 5 deletions(-) [+] |
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--- a/vdp.c Wed Jan 04 22:48:00 2017 -0800 +++ b/vdp.c Wed Jan 04 23:01:58 2017 -0800 @@ -2177,7 +2177,7 @@ } else { uint8_t mode_5 = context->regs[REG_MODE_2] & BIT_MODE_5; context->address = (context->address &0xC000) | (value & 0x3FFF); - //Genesis Plus GX doesn't clear out the mode bits in Mode 4, but instead + //Genesis Plus GX doesn't clear out the upper mode bits in Mode 4, but instead //ignores the uppper mode bits when it comes to reads/writes //testing on hardware is needed to determine which is truly correct context->cd = (mode_5 ? context->cd &0x3C : 0) | (value >> 14); @@ -2388,10 +2388,7 @@ //Should this happen after the prefetch or after the read? increment_address(context); } - context->cd &= ~1; - if (context->cd == VRAM_READ) { - context->cd = VRAM_READ8; - } + context->cd = VRAM_READ8; return context->prefetch; }