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fixed from https://forums.nesdev.com/viewtopic.php?f=2&t=19686#p257380

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This commit is contained in:
Steven Hugg 2020-10-06 14:03:42 -05:00
parent 3e37d9caf6
commit e81f6989ce
1 changed files with 10 additions and 0 deletions
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10
presets/nes/irq.c
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@ -59,6 +59,16 @@ void __fastcall__ irq_nmi_callback(void) {
void main(void)
{
// More accurate NES emulators simulate the mapper's
// monitoring of the A12 line, so the background and
// sprite pattern tables must be different.
// https://forums.nesdev.com/viewtopic.php?f=2&t=19686#p257380
set_ppu_ctrl_var(get_ppu_ctrl_var() | 0x08);
// Enable Work RAM
POKE(0xA001, 0x80);
// Mirroring - horizontal
POKE(0xA000, 0x01);
// set up MMC3 IRQs every 8 scanlines
MMC3_IRQ_SET_VALUE(7);
MMC3_IRQ_RELOAD();