KBC P1 readout fixes.

2025-08-23 16:45:06 +02:00
parent d333ea8b4f
commit fbe69ab218
3 changed files with 10 additions and 18 deletions
--- a/src/machine/machine_table.c
+++ b/src/machine/machine_table.c
@@ -19831,7 +19831,8 @@ machine_generic_p1_handler(void)
 uint8_t
 machine_get_p1(uint8_t kbc_p1)
 {
-    uint8_t ret = 0xff;
+    uint8_t low_bits = ((machine_p1 >> 8) + 1) & 0x03;
+    uint8_t ret      = 0xff;

    if (machines[machine].p1_handler)
        ret = machines[machine].p1_handler();
@@ -19844,6 +19845,8 @@ machine_get_p1(uint8_t kbc_p1)

    ret &= kbc_p1;

+    machine_p1 = (machine_p1 & 0xfffffcff) | (low_bits << 8);
+
    return ret;
 }