CINT adjustments for 'Operacja Proboszcz' game

2019-10-20 12:32:14 +02:00
1 parent 2009702011
commit 0f80941eac
@@ -1,15 +1,15 @@

 //
-// Official Kernal routine, described in:
+// It seems this is a part CINT which initializes screen and keyboard, but does not
+// reset VIC-II. See here: https://csdb.dk/forums/index.php?roomid=11&topicid=17048&firstpost=22
 //
+// For more details see:
 // - [RG64] C64 Programmer's Reference Guide   - page 280
 // - [CM64] Compute's Mapping the Commodore 64 - page 242
-//
-// CPU registers that has to be preserved (see [RG64]): none
-//

+cint_screen_keyboard_real:

-cint_real:
+	// XXX check what really is performed here

 	// According to [CM64], this routine checks for PAL/NTSC. It's definitely not done
 	// within the 'BRK' part, this can be easily checked - POKE something
@@ -116,9 +116,6 @@ cint_brk: // entry for BRK and STOP+RESTORE - XXX, where should it start?
 	ldx #$00
 	stx MODE

-	// Setup video and I/O
-	jsr setup_vicii
-
 	// Fallthrough/jump to screen clear routine (Compute's Mapping the 64 p215)

 	jmp clear_screen
@@ -0,0 +1,6 @@
+
+// Routine too long to fit here
+
+cint_screen_keyboard:
+
+	jmp cint_screen_keyboard_real
@@ -0,0 +1,2 @@
+
+Game 'Operacja Proboszcz' explicitly calls this location.
@@ -1,6 +0,0 @@
-
-// Our implementation is longer than the original one,
-// placing it here would cause a collision with OPEN
-
-CINT:
-    jmp cint_real
@@ -0,0 +1,16 @@
+
+//
+// Official Kernal routine, described in:
+//
+// - [RG64] C64 Programmer's Reference Guide   - page 280
+// - [CM64] Compute's Mapping the Commodore 64 - page 242
+//
+// CPU registers that has to be preserved (see [RG64]): none
+//
+
+CINT:
+
+	// Setup video and I/O
+	jsr setup_vicii
+
+	jmp cint_screen_keyboard
@@ -12,6 +12,7 @@ default_brk_handler:

 	jsr JRESTOR
 	jsr JIOINIT
+	jsr setup_vicii // XXX should probably be a part of cint_brk
 	jsr cint_brk

 	cli
				`@@ -0,0 +1,2 @@`

				`Game 'Operacja Proboszcz' explicitly calls this location.`