set IRQ frequency depending on video system

c64/kernal/cint.s

@@ -14,31 +14,7 @@ cint:
 cint_brk: ; entry for BRK and STOP+RESTORE - XXX, where should it start?
 
 	jsr setup_vicii
-
-	;; Detect video system (PAL/NTSC), use Graham's method, as it's short and reliable
-	;; see here: https://codebase64.org/doku.php?id=base:detect_pal_ntsc
-
-cint_w0:
-	lda VIC_RASTER
-cint_w1:
-	cmp VIC_RASTER
-    beq cint_w1
-    bmi cint_w0
-
-	;; Result in A, if no interrupt happened during the test:
-	;; #$37 -> 312 rasterlines, PAL,  VIC 6569
-	;; #$06 -> 263 rasterlines, NTSC, VIC 6567R8
-	;; #$05 -> 262 rasterlines, NTSC, VIC 6567R56A
-
-	cmp #$07
-	bcs cint_pal
-cint_ntsc:
-	lda #$00
-	beq +
-cint_pal:
-	lda #$01
-*
-	sta PALNTSC
+	jsr setup_pal_ntsc
 
 	;; Initialise cursor blink flags  (Compute's Mapping the 64 p215)
 	lda #$00