small tape support + turbo mode tweaks

src/kernal/board_m65/mega65_tape_fast_cpu.s

@@ -0,0 +1,31 @@
+;; #LAYOUT# M65 KERNAL_1 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+;
+; Tape helper routine
+;
+; - unlocks VIC-IV
+; - switches CPU to fast processing mode and disables badlines
+; - stores previous VIC_CTRLB in NXTBIN
+;
+
+!ifdef HAS_TAPE {
+
+
+tape_fast_cpu:
+
+	jsr M65_MODEGET
+	bcc @1
+	
+	jsr viciv_unhide
+@1:
+	lda VIC_CTRLB
+	ora #%01000000
+	sta VIC_CTRLB
+	sta NXTBIT
+
+	lda #$00
+	sta MISC_EMU
+
+	rts
+}

src/kernal/board_u64/ultimate64_slow_fast.s

@@ -0,0 +1,22 @@
+;; #LAYOUT# STD *        #TAKE
+;; #LAYOUT# *   KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+
+!ifdef CONFIG_MB_U64 {
+
+U64_SLOW:
+
+	lda #$00                           ; for U64_TURBOCTL - badlines, 1MHz
+
+	+skip_2_bytes_trash_nvz
+
+	; FALLTROUGH
+
+U64_FAST:
+
+	lda #$0F                           ; for U64_TURBOCTL - badlines, 48MHz
+	sta SCPU_SPEED_TURBO               ; any value will do
+
+	rts
+}

src/kernal/init/fce2.hw_entry_reset.s

@@ -32,6 +32,12 @@ hw_entry_reset:
 	jsr m65_reset_part
 }
 
+!ifdef CONFIG_MB_U64 {
+
+	jsr U64_SLOW
+	sta SCPU_SPEED_NORMAL
+}
+
 !ifdef CONFIG_PLATFORM_COMMODORE_64 {
 
 	; The following routine is based on reading the public KERNAL jumptable routine

src/kernal/tape/tape_common_screen.s

@@ -30,8 +30,7 @@ tape_screen_on_motor_off:
 	lda #$03
 	sta MISC_EMU
 
-	lda VIC_CTRLB
-	and #%10111111
+	lda NXTBIT
 	sta VIC_CTRLB
 
 	sta VIC_KEY
@@ -70,18 +69,7 @@ tape_screen_off_motor_on:
 	; to be handled by 1 MHz CPU - so in case of compatibility mode, switch CPU to fast speed
 	; (and disable badlines, so we will not have to blank the screen)
 
-	jsr M65_MODEGET
-	bcc @2
-	
-	jsr viciv_unhide
-
-	lda VIC_CTRLB
-	ora #%01000000
-	sta VIC_CTRLB
-
-	lda #$00
-	sta MISC_EMU
-@2:
+	jsr tape_fast_cpu
 
 } else ifdef CONFIG_MB_U64 {
 
@@ -90,10 +78,8 @@ tape_screen_off_motor_on:
 	cmp #$FF
 	beq @2                             ; branch if no turbo control available
 
-	lda #$8F                           ; max speed, no badlines
-	sta U64_TURBOCTL
+	jsr U64_FAST                       ; max speed, no badlines
 	bne @3                             ; branch always
-
 @2:
 	jsr screen_off
 @3:

src/kernal/tape/tape_head_align.s

@@ -45,6 +45,17 @@ tape_head_align:
 
 	jsr nmi_lock
 
+	; Switch CPU to fast mode
+
+!ifdef CONFIG_MB_M65 {
+	jsr tape_fast_cpu
+}
+
+!ifdef CONFIG_MB_U64 {
+	jsr U64_FAST
+	sta SCPU_SPEED_TURBO
+}
+
 	; Prepare CIA timers
 
 	ldx #$02                  ; set timer A to 3 ticks