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apple2cp: fix VBL register access, solves hang in Prince of Persia [R. Belmont]

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This commit is contained in:
arbee 2022-09-22 19:23:17 -04:00
parent 7dfa4bd8b7
commit d14b57c4c0
1 changed files with 6 additions and 0 deletions
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6
src/mame/apple/apple2e.cpp
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@ -2591,6 +2591,10 @@ void apple2e_state::c000_iic_w(offs_t offset, u8 data)
m_accel_fast = false; m_accel_fast = false;
accel_normal_speed(); accel_normal_speed();
} }
else
{
do_io(offset, true);
}
} }
break; break;
@ -2600,6 +2604,7 @@ void apple2e_state::c000_iic_w(offs_t offset, u8 data)
m_accel_fast = true; m_accel_fast = true;
accel_full_speed(); accel_full_speed();
} }
do_io(offset, true);
break; break;
case 0x5c: case 0x5c:
@ -2607,6 +2612,7 @@ void apple2e_state::c000_iic_w(offs_t offset, u8 data)
{ {
m_accel_slotspk = data; m_accel_slotspk = data;
} }
do_io(offset, true);
break; break;
case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77: case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77: