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Don't add ROM waitstates on slow CPUs (<= 8 MHz). Fixes IBM AT.

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This commit is contained in:
SarahW 2018-03-12 20:52:07 +00:00
commit 5762431260
1 changed files with 6 additions and 1 deletions
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7
src/cpu.c
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@ -520,7 +520,10 @@ void cpu_set()
isa_cycles = cpu_s->atclk_div; isa_cycles = cpu_s->atclk_div;
cpu_rom_prefetch_cycles = cpu_s->rspeed / 1000000; if (cpu_s->rspeed <= 8000000)
cpu_rom_prefetch_cycles = cpu_mem_prefetch_cycles;
else
cpu_rom_prefetch_cycles = cpu_s->rspeed / 1000000;
if (cpu_s->pci_speed) if (cpu_s->pci_speed)
{ {
@ -1680,6 +1683,8 @@ void cpu_update_waitstates()
if (is486) if (is486)
cpu_prefetch_cycles *= 4; cpu_prefetch_cycles *= 4;
cpu_mem_prefetch_cycles = cpu_prefetch_cycles; cpu_mem_prefetch_cycles = cpu_prefetch_cycles;
if (cpu_s->rspeed <= 8000000)
cpu_rom_prefetch_cycles = cpu_mem_prefetch_cycles;
} }
void cpu_set_turbo(int turbo) void cpu_set_turbo(int turbo)