adjuster startup once again - not the most effective way, but should be more compatible with cartridges

c64/kernal/cint.s

@@ -11,14 +11,55 @@
 
 cint:
 
+	;; 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
+	;; to address 678 on a real C64, press STOP+RESTORE, the value won't change
+
+	;; 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
+
+	lda #$C8 ; preparation, as the VIC might be uninitialized
+	sta VIC_SCROLX
+
+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:
+
+	;; NTSC C64 (https://codebase64.org/doku.php?id=base:cpu_clocking),
+	;; is clocked at 1.022727 MHz, so that 1/60s is 17045 CPU cycles
+
+	ldy #<17045
+	ldx #>17045
+
+	sty CIA1_TIMALO
+	stx CIA1_TIMAHI
+
+	lda #$00
+	beq +
+
+cint_pal:
+
+	lda #$01
+*
+	sta PALNTSC
+
 cint_brk: ; entry for BRK and STOP+RESTORE - XXX, where should it start?
 
 	jsr setup_vicii
 
-	;; According to [CM64], this routine also checks for PAL/NTSC - this must be a mistake,
-	;; it's too late (IOINIT already needs this information), besides - POKE something
-	;; to address 678 on a real C64, press STOP+RESTORE - the value won't change
-
 	;; Initialise cursor blink flags  (Compute's Mapping the 64 p215)
 	lda #$00
 	sta cursor_blink_disable

c64/kernal/fda3.ioinit.s

@@ -34,32 +34,7 @@ ioinit:
 	cpy #$80 ; $20 * amount of chips to silence, $80 to silence 4 chips
 	bne -
 
-	;; 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
 
-ioinit_w0:
-	lda VIC_RASTER
-ioinit_w1:
-	cmp VIC_RASTER
-	beq ioinit_w1
-	bmi ioinit_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 ioinit_pal
-
-ioinit_ntsc:
-	lda #$00
-	beq +
-
-ioinit_pal:
-	lda #$01
-*
-	sta PALNTSC
 
 	;; XXX: calibrate TOD for both CIA's, see here: https://codebase64.org/doku.php?id=base:efficient_tod_initialisation
 
@@ -81,17 +56,6 @@ ioinit_pal:
 	ldy #<16421
 	ldx #>16421
 
-	lda PALNTSC
-	bne +
-
-	;; NTSC C64 (https://codebase64.org/doku.php?id=base:cpu_clocking),
-	;; is clocked at 1.022727 MHz, so that 1/60s is 17045 CPU cycles
-
-	ldy #<17045
-	ldx #>17045
-
-	;; Store the IRQ timing constant to CIA chip
-*
 	sty CIA1_TIMALO
 	stx CIA1_TIMAHI
 

c64/kernal/reset_entry.s

@@ -13,14 +13,8 @@ reset_entry:
 
 	; The following routine is based on reading the public KERNAL jumptable routine
 	; list, and making unimaginative assumptions about what should be done on reset.
-
-	; According to example here: https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image
-	; the cartridge does not call RAMTAS - despite it's obviously required. So, call RAMTAS
-	; before the cartridge check/takeover
-
-	; Setting up the screen and testing ram is obviously required
-	; also affirmed by p269 of c64 prg
-	jsr RAMTAS
+	; Also, https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image was used
+	; as it shows example startup sequence, to be followe by cartridge creators
 
 	; C64 PRG p269
 	jsr cartridge_check
@@ -28,10 +22,12 @@ reset_entry:
 	jmp (ICART_COLD_START)
 *
 	; Initialising IO is obviously required. Also indicated by c64 prg p269.
-	; Has to be after ther RAMTAS, as it clears memory, including the PAL/NTSC flag,
-	; which is set by IOINIT
 	jsr IOINIT
 	
+	; Setting up the screen and testing ram is obviously required
+	; also affirmed by p269 of c64 prg
+	jsr RAMTAS ; called RANTAM on Codebase64 wiki
+	
 	; Resetting IO vectors is obviously required, if we want interrupts to run
 	; also affirmed by c64 prg p269
 	jsr RESTOR