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bank_test.asm
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; bank_test.asm - Commodore 64 memory bank test chart
; Copyright (c) 2020 by David R. Van Wagner
; Open Source - MIT LICENSE
;
; github.com/davervw
; blog.davevw.com
; x.com/davervw
start=$c000 ; machine language org
chrout=$ffd2
* = start
sei
jsr disp_header
jsr bank_norm
lda #$A0
sta $A000
lda #$C8
sta $C800
lda #$0E
sta $D800
lda #$E0
sta $E000
jsr bank_ram
lda #$D8
sta $D800
jsr bank_norm
lda #0
sta my_bank
- jsr disp_test
inc my_bank
lda #$07
bit my_bank
beq +
bne -
+ jsr bank_norm
cli
rts
bank_norm
lda $01
ora #$07
sta $01
rts
bank_ram
lda $01
and #$f8
sta $01
rts
bank_select
lda $01
and #$f8
ora my_bank
sta $01
rts
disp_test
lda #' '
jsr chrout
lda my_bank
jsr disp_hex
lda #$00
ldx #$A0
jsr disp_banked
lda #$00
ldx #$C8
jsr disp_banked
lda #$00
ldx #$D8
jsr disp_banked
lda #$00
ldx #$E0
jsr disp_banked
lda #13
jsr chrout
rts
disp_banked
sta $FB
stx $FC
lda #' '
jsr chrout
jsr chrout
jsr chrout
ldy #0
jsr bank_select
lda ($FB),Y
pha
jsr bank_norm
pla
jsr disp_hex
rts
disp_hex
pha
lsr
lsr
lsr
lsr
jsr disp_digit
pla
and #$0f
; fall thru disp_digit
disp_digit
cmp #16
bcs ++
cmp #10
bcs +
adc #'0'
jmp chrout
+ sbc #$0A
adc #$40
jmp chrout
++ rts
disp_header
ldy #0
- lda header,y
beq +
jsr chrout
iny
bne -
+ rts
header
!text "BANK A000 C800 D800 E000"
!byte 13 ; carriage return
!byte 0 ; end of string
my_bank !byte 0