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sega/model3.cpp: system port 8 is just an irq check strobe

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* fix spikeout/spikeofe bootup
This commit is contained in:
angelosa 2025-05-23 19:06:35 +02:00
parent ec14ab6887
commit 5f591fb5f8
1 changed files with 9 additions and 28 deletions
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37
src/mame/sega/model3.cpp
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@ -30,7 +30,7 @@
vs2 - works vs2 - works
harley - works harley - works
skichamp - boots after skipping the drive board errors, massive slowdowns skichamp - boots after skipping the drive board errors, massive slowdowns
srally2 - works srally2 - works, uses JTAG patch, draws no polygon if coin is inserted at Sega logo
srally2p/srally2pa/sraly2dx - needs specific JTAG patch / bypass srally2p/srally2pa/sraly2dx - needs specific JTAG patch / bypass
von2/von2a/von2o/von254g - works von2/von2a/von2o/von254g - works
fvipers2 - crashes after player selection fvipers2 - crashes after player selection
@ -1520,33 +1520,13 @@ void model3_state::model3_sys_w(offs_t offset, uint64_t data, uint64_t mem_mask)
else logerror("m3_sys: unknown mask on IRQen write\n"); else logerror("m3_sys: unknown mask on IRQen write\n");
break; break;
case 0x18/8: case 0x18/8:
if ((mem_mask & 0xff000000) == 0xff000000) // int ACK with bits in REVERSE ORDER from the other registers (Seeeee-gaaaa!) if ((mem_mask & 0xff000000) == 0xff000000)
{ // may also be a secondary enable based on behavior of e.g. magtruck VBL handler {
// uint32_t old_irq = m_irq_state; // check irq status only
uint8_t ack = (data>>24)&0xff, realack; // - spikeout/spikeofe cares about this;
int i; // - vs215o implies that the value written doesn't really matter
// (writes the full range of 0-0xff), classifying this as a strobe only
switch (ack) update_irq_state();
{
case 0xff: // no ack, do nothing
return;
default:
realack = 0xff; // default to all bits set, no clearing
for (i = 7; i >= 0; i--)
{
// if bit is clear, clear the bit on the opposite end
if (!(ack & (1<<i)))
{
realack &= ~(1<<(7-i));
}
}
// printf("%x to ack (realack %x)\n", ack, realack);
m_irq_state &= realack;
break;
}
} }
else else
{ {
@ -6920,6 +6900,7 @@ void model3_state::init_dayto2pe()
// rom[(0x64ca34^4)/4] = 0x60000000; // dec // rom[(0x64ca34^4)/4] = 0x60000000; // dec
} }
// TODO: sound dies often without these patches, investigate
void model3_state::init_spikeout() void model3_state::init_spikeout()
{ {
uint32_t *rom = (uint32_t*)memregion("user1")->base(); uint32_t *rom = (uint32_t*)memregion("user1")->base();