support Mockingboard 4C in slot 5

2025-04-07 00:37:12 +00:00 · 2025-01-04 11:08:44 -08:00 · 2025-01-04 11:08:44 -08:00 · 81fce4c7bc
commit 81fce4c7bc
parent bb6b388c16
1 changed files with 15 additions and 1 deletions
--- a/src/hw.mockingboard.a
+++ b/src/hw.mockingboard.a
@ -56,8 +56,22 @@ GetMockingboardStuff
         sta   MAGIC_Z80_LOCATION, x
         dex
         bpl   -
-         stx   $C403                 ; enable Mockingboard 4C support
+
+         lda   $C405
+         cmp   #$38
+         bne   @not_mouse
+         lda   $C407
+         cmp   #$18
+         beq   @use_slot5            ; looks like the mouse
+
+@not_mouse
+         stx   $C403                 ; enable Mockingboard 4C support in slot 4
         stx   $C404
+         bne   @not_iic              ; always
+
+@use_slot5
+         stx   $C503                 ; try enable Mockingboard 4C support in slot 5 instead
+         stx   $C504

@not_iic
         lda   #$00