SSC Bug Fixes (#857)

code-bythepound · web-flow · commit 48df1f6d78e3 · 2025-04-11T19:51:52.000-07:00
* Fix for SSC bug

* use correct CN to MSLOT
diff --git a/desk.acc/print.catalog.s b/desk.acc/print.catalog.s
@@ -870,6 +870,9 @@ fail:
         stx     vector+1
         ldx     #>SLOT1                  ; X = $Cn
         ldy     #((>SLOT1)<<4)&%11110000 ; Y = $n0
+        ;; A2MISC TechNote #3 SSC C800 space
+        stx     MSLOT
+        stx     $CFFF
 vector: jsr     SLOT1                    ; self-modified
 
         ;; Back to what DeskTop expects
diff --git a/desk.acc/print.screen.s b/desk.acc/print.screen.s
@@ -242,6 +242,9 @@ loop:   jsr     SendRow
         stx     vector+1
         ldx     #>SLOT1                  ; X = $Cn
         ldy     #((>SLOT1)<<4)&%11110000 ; Y = $n0
+        ;; A2MISC TechNote #3 SSC C800 space
+        stx     MSLOT
+        stx     $CFFF
 vector: jmp     SLOT1                    ; self-modified
 .endproc ; GoCard
 
diff --git a/inc/apple2.inc b/inc/apple2.inc
@@ -133,6 +133,7 @@ CON_QUARTER     := $F070        ; 1/4
 
 ;;; Other
 FBUFFR          := $100
+MSLOT           := $7F8         ; Slot in use, in case of IRQ
 
 
 ;;; ============================================================
