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The PIC now once again returns IRR in invalid modes, fixes #3602.

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OBattler
2023-08-20 02:04:42 +02:00
parent 13659d7a4c
commit 66db65e69b
1 changed files with 4 additions and 0 deletions
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4
src/pic.c
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@@ -442,6 +442,10 @@ pic_read(uint16_t addr, void *priv)
} }
} else { } else {
/* Standard 8259 PIC read */ /* Standard 8259 PIC read */
#ifndef UNDEFINED_READ
/* Put the IRR on to the data bus by default until the real PIC is probed. */
dev->data_bus = dev->irr;
#endif
if (dev->ocw3 & 0x04) { if (dev->ocw3 & 0x04) {
if (dev->int_pending) { if (dev->int_pending) {
dev->data_bus = 0x80 | (dev->interrupt & 7); dev->data_bus = 0x80 | (dev->interrupt & 7);