attempt tro fix https://github.com/MEGA65/open-roms/issues/68

src/kernal/board_m65/mega65_hypervisor_reset.s

@@ -8,33 +8,33 @@ m65_hypervisor_reset:
 
 	; Proceed like with normal reset, skip problematic parts
 
-	sei                      ; disable the interrupts, as fast as possible
-	cld                      ; Kernal is not designed to operate in decimal mode
+	sei                                ; disable the interrupts, as fast as possible
+	cld                                ; Kernal is not designed to operate in decimal mode
 
 	lda #$00
-	sta NMINV+1              ; soft-disable custom NMI interrupt handler
+	sta NMINV+1                        ; soft-disable custom NMI interrupt handler
 
 	; Do not reset the stack (see, ldx #$FF, txs) - we need to know where to return
 	
-	jsr m65_reset_part       ; init MEGA65 specific hardware, shutdown VIC-IV, clear native mode mark
-	ldx #$28                 ; 40 columns, screen disabled for now
+	jsr m65_reset_part                 ; init MEGA65 specific hardware, shutdown VIC-IV, clear native mode mark
+	ldx #$28                           ; 40 columns, screen disabled for now
 	stx VIC_SCROLX
 
-	jsr IOINIT_skip_DOS      ; better not to initialize DOS under hypervisor, risk of incompatibility
-	jsr m65_reset_common     ; RAMTAS, RESTOR, CINT
+	jsr IOINIT_skip_DOS                ; better not to initialize DOS under hypervisor, risk of incompatibility
+	jsr m65_reset_part_skip_palette    ; also skip palette setting, but do RAMTAS, RESTOR, CINT
 
 	; Restore hypervisor memory mapping and quit
 
-	lda #$00                 ; lower memory  - megabyte $00
-	ldx #$0F                 ; lower memory  - request to set the megabyte
-	ldy #$FF                 ; higher memory - megabyte $FF
-	ldz #$0F                 ; higher memory - request to set the megabyte
+	lda #$00                           ; lower memory  - megabyte $00
+	ldx #$0F                           ; lower memory  - request to set the megabyte
+	ldy #$FF                           ; higher memory - megabyte $FF
+	ldz #$0F                           ; higher memory - request to set the megabyte
 
 	map
 
-	tax                      ; lower memory  - keep unmapped (.A is already 0)
-	tay                      ; higher memory - lower 16 bits of the offset are also 0's
-	ldz #$3F                 ; higher memory - map is %0011 = $3, offset is $FF0
+	tax                                ; lower memory  - keep unmapped (.A is already 0)
+	tay                                ; higher memory - lower 16 bits of the offset are also 0's
+	ldz #$3F                           ; higher memory - map is %0011 = $3, offset is $FF0
 
 	map
 	eom

src/kernal/board_m65/mega65_reset_part.s

@@ -8,6 +8,11 @@ m65_reset_part:
 
 	jsr map_KERNAL_1
 	jsr (VK1__m65_colorset_reset)
+
+	; FALLTROUGH
+
+m65_reset_part_skip_palette:           ; for hypervisor reset do not set palette, see https://github.com/MEGA65/open-roms/issues/68
+
 	jsr map_NORMAL                     ; we want normal memory mapping
 
 	jsr viciv_shutdown                 ; by default we do not want the VIC-IV