From 1d7bc938f2a3f0790c1e16921beb039cb1b5720e Mon Sep 17 00:00:00 2001
From: mrdudz <mrdudz@users.noreply.github.com>
Date: Sun, 22 Jun 2025 01:18:41 +0200
Subject: [PATCH] add roundtrip disasm tests for all cpus

---
 test/dasm/45GS02-disass.s  | 381 +++++++++++++++++++++++++++++++++++++
 test/dasm/6502-disass.s    |   8 +
 test/dasm/6502DTV-disass.s | 188 ++++++++++++++++++
 test/dasm/6502X-disass.s   |  30 +++
 test/dasm/65C02-disass.s   | 214 +++++++++++++++++++++
 test/dasm/65SC02-disass.s  | 181 ++++++++++++++++++
 test/dasm/huc6280-disass.s | 250 ++++++++++++++++++++++++
 test/dasm/m740-disass.s    |   8 +
 test/dasm/readme.txt       |   9 +
 9 files changed, 1269 insertions(+)
 create mode 100644 test/dasm/45GS02-disass.s
 create mode 100644 test/dasm/6502-disass.s
 create mode 100644 test/dasm/6502DTV-disass.s
 create mode 100644 test/dasm/6502X-disass.s
 create mode 100644 test/dasm/65C02-disass.s
 create mode 100644 test/dasm/65SC02-disass.s
 create mode 100644 test/dasm/huc6280-disass.s
 create mode 100644 test/dasm/m740-disass.s
 create mode 100644 test/dasm/readme.txt

diff --git a/test/dasm/45GS02-disass.s b/test/dasm/45GS02-disass.s
new file mode 100644
index 000000000..1ed174a2f
--- /dev/null
+++ b/test/dasm/45GS02-disass.s
@@ -0,0 +1,381 @@
+.setcpu "45GS02"
+
+ZP = $12
+ABS = $1234
+
+   brk
+   ora ($05,x)
+   cle
+   see
+   tsb $02
+   ora $02
+   asl $02
+   rmb0 $02
+   php
+   ora #$01
+   asl
+   tsy
+   tsb $1234
+   ora $1234
+   asl $1234
+   bbr0 $02, L0
+L0:
+   bpl L0
+   ora ($06),y
+   ora ($07),z
+   lbpl *+$3133 ; bpl *+$3133
+   trb $02
+   ora $03,x
+   asl $03,x
+   rmb1 $02
+   clc
+   ora $1456,y
+   inc
+   inz
+   trb $1234
+   ora $1345,x
+   asl $1345,x
+   bbr1 $02,L1
+L1:
+   jsr $1234
+   and ($05,x)
+   jsr ($2345)
+   jsr ($2456,x)
+   bit $02
+   and $02
+   rol $02
+   rmb2 $02
+   plp
+   and #$01
+   rol
+   tys
+   bit $1234
+   and $1234
+   rol $1234
+   bbr2 $02,L2
+L2:
+   bmi L2
+   and ($06),y
+   and ($07),z
+   lbmi *+$3133 ; bmi *+$3133
+   bit $03,x
+   and $03,x
+   rol $03,x
+   rmb3 $02
+   sec
+   and $1456,y
+   dec
+   dez
+   bit $1345,x
+   and $1345,x
+   rol $1345,x
+   bbr3 $02,L3
+L3:
+   rti
+   eor ($05,x)
+   neg
+   asr
+   asr $02
+   eor $02
+   lsr $02
+   rmb4 $02
+   pha
+   eor #$01
+   lsr
+   taz
+   jmp $1234
+   eor $1234
+   lsr $1234
+   bbr4 $02,L4
+L4:
+   bvc L4
+   eor ($06),y
+   eor ($07),z
+   lbvc *+$3133 ; bvc *+$3133
+   asr $03,x
+   eor $03,x
+   lsr $03,x
+   rmb5 $02
+   cli
+   eor $1456,y
+   phy
+   tab
+   map
+   eor $1345,x
+   lsr $1345,x
+   bbr5 $02,L5
+L5:
+   rts
+   adc ($05,x)
+   rtn #$09
+   bsr *+$3133
+   stz $02
+   adc $02
+   ror $02
+   rmb6 $02
+   pla
+   adc #$01
+   ror
+   tza
+   jmp ($2345)
+   adc $1234
+   ror $1234
+   bbr6 $02,L6
+L6:
+   bvs L6
+   adc ($06),y
+   adc ($07),z
+   lbvs *+$3133 ; bvs *+$3133
+   stz $03,x
+   adc $03,x
+   ror $03,x
+   rmb7 $02
+   sei
+   adc $1456,y
+   ply
+   tba
+   jmp ($2456,x)
+   adc $1345,x
+   ror $1345,x
+   bbr7 $02,L7
+L7:
+   bra L7
+   sta ($05,x)
+   sta ($0f,s),y
+   sta ($0f,sp),y
+   lbra *+$3133 ; bra *+$3133
+   sty $02
+   sta $02
+   stx $02
+   smb0 $02
+   dey
+   bit #$01
+   txa
+   sty $1345,x
+   sty $1234
+   sta $1234
+   stx $1234
+   bbs0 $02,L8
+L8:
+   bcc L8
+   sta ($06),y
+   sta ($07),z
+   lbcc *+$3133 ; bcc *+$3133
+   sty $03,x
+   sta $03,x
+   stx $04,y
+   smb1 $02
+   tya
+   sta $1456,y
+   txs
+   stx $1456,y
+   stz $1234
+   sta $1345,x
+   stz $1345,x
+   bbs1 $02,L9
+L9:
+   ldy #$01
+   lda ($05,x)
+   ldx #$01
+   ldz #$01
+   ldy $02
+   lda $02
+   ldx $02
+   smb2 $02
+   tay
+   lda #$01
+   tax
+   ldz $1234
+   ldy $1234
+   lda $1234
+   ldx $1234
+   bbs2 $02,L10
+L10:
+   bcs L10
+   lda ($06),y
+   lda ($07),z
+   lbcs *+$3133 ; bcs *+$3133
+   ldy $03,x
+   lda $03,x
+   ldx $04,y
+   smb3 $02
+   clv
+   lda $1456,y
+   tsx
+   ldz $1345,x
+   ldy $1345,x
+   lda $1345,x
+   ldx $1456,y
+   bbs3 $02,L11
+L11:
+   cpy #$01
+   cmp ($05,x)
+   cpz #$01
+   dew $02
+   cpy $02
+   cmp $02
+   dec $02
+   smb4 $02
+   iny
+   cmp #$01
+   dex
+   asw $1234
+   cpy $1234
+   cmp $1234
+   dec $1234
+   bbs4 $02,L12
+L12:
+   bne L12
+   cmp ($06),y
+   cmp ($07),z
+   lbne *+$3133 ; bne *+$3133
+   cpz $02
+   cmp $03,x
+   dec $03,x
+   smb5 $02
+   cld
+   cmp $1456,y
+   phx
+   phz
+   cpz $1234
+   cmp $1345,x
+   dec $1345,x
+   bbs5 $02,L13
+L13:
+   cpx #$01
+   sbc ($05,x)
+   lda ($0f,s),y
+   lda ($0f,sp),y
+   inw $02
+   cpx $02
+   sbc $02
+   inc $02
+   smb6 $02
+   inx
+   sbc #$01
+   eom
+   nop
+   row $1234
+   cpx $1234
+   sbc $1234
+   inc $1234
+   bbs6 $02,L14
+L14:
+   beq L14
+   sbc ($06),y
+   sbc ($07),z
+   lbeq *+$3133 ; beq *+$3133
+   phd #$089a
+   phw #$089a
+   sbc $03,x
+   inc $03,x
+   smb7 $02
+   sed
+   sbc $1456,y
+   plx
+   plz
+   phd $1234
+   phw $1234
+   sbc $1345,x
+   inc $1345,x
+   bbs7 $02,L15
+L15:
+
+   adc [$12],z
+
+   adcq $12
+   adcq $3456
+   adcq ($78)
+   adcq [$9a]
+
+   and [$12],z
+
+   andq $12
+   andq $3456
+   andq ($78)
+   andq [$9a]
+
+   aslq $12
+   aslq
+   aslq $3456
+   aslq $78,x
+   aslq $9abc,x
+
+   asrq
+   asrq $12
+   asrq $34,x
+
+   bitq $12
+   bitq $3456
+
+   cmp [$12],z
+
+   cmpq $12
+   cmpq $3456
+   cmpq ($78)
+   cmpq [$9a]
+
+   deq
+   deq $12
+   deq $3456
+   deq $78,x
+   deq $9abc,x
+
+   eor [$12],z
+
+   eorq $12
+   eorq $3456
+   eorq ($78)
+   eorq [$9a]
+
+   inq
+   inq $12
+   inq $3456
+   inq $78,x
+   inq $9abc,x
+
+   lda [$12],z
+
+   ldq $12
+   ldq $3456
+   ldq ($78),z
+   ldq [$9a],z
+
+   lsrq $12
+   lsrq
+   lsrq $3456
+   lsrq $78,x
+   lsrq $9abc,x
+
+   ora [$12],z
+
+   orq $12
+   orq $3456
+   orq ($78)
+   orq [$9a]
+
+   rolq $12
+   rolq
+   rolq $3456
+   rolq $78,x
+   rolq $9abc,x
+
+   rorq $12
+   rorq
+   rorq $3456
+   rorq $78,x
+   rorq $9abc,x
+
+   sbc [$12],z
+
+   sbcq $12
+   sbcq $3456
+   sbcq ($78)
+   sbcq [$9a]
+
+   sta [$12],z      ; EA 92 12
+
+   stq $12
+   stq $3456
+   stq ($78)
+   stq [$9a]
diff --git a/test/dasm/6502-disass.s b/test/dasm/6502-disass.s
new file mode 100644
index 000000000..794eead76
--- /dev/null
+++ b/test/dasm/6502-disass.s
@@ -0,0 +1,8 @@
+
+    .setcpu "6502"
+
+    .repeat 256, cnt
+
+    .byte 0 + cnt, $02, $ea, $00
+
+    .endrepeat
diff --git a/test/dasm/6502DTV-disass.s b/test/dasm/6502DTV-disass.s
new file mode 100644
index 000000000..5254923c5
--- /dev/null
+++ b/test/dasm/6502DTV-disass.s
@@ -0,0 +1,188 @@
+.setcpu "6502DTV"
+
+   brk
+   ora     ($12,x)
+   nop     $12
+   ora     $12
+   asl     $12
+   php
+   ora     #$12
+   asl     a
+   anc     #$12
+   nop     $3456
+   ora     $3456
+   asl     $3456
+   bpl     *+2
+   ora     ($12),y
+   bra     *+2
+   nop     $12,x
+   ora     $12,x
+   asl     $12,x
+   clc
+   ora     $3456,y
+   nop     $3456,x
+   ora     $3456,x
+   asl     $3456,x
+   jsr     $3456
+   and     ($12,x)
+   rla     ($12,x)
+   bit     $12
+   and     $12
+   rol     $12
+   rla     $12
+   plp
+   and     #$12
+   rol     a
+   bit     $3456
+   and     $3456
+   rol     $3456
+   rla     $3456
+   bmi     *+2
+   and     ($12),y
+   sac     #$12
+   rla     ($12),y
+   and     $12,x
+   rol     $12,x
+   rla     $12,x
+   sec
+   and     $3456,y
+   rla     $3456,y
+   and     $3456,x
+   rol     $3456,x
+   rla     $3456,x
+   rti
+   eor     ($12,x)
+   sir     #$12
+   eor     $12
+   lsr     $12
+   pha
+   eor     #$12
+   lsr     a
+   alr     #$12
+   jmp     $3456
+   eor     $3456
+   lsr     $3456
+   bvc     *+2
+   eor     ($12),y
+   eor     $12,x
+   lsr     $12,x
+   cli
+   eor     $3456,x
+   lsr     $3456,x
+   rts
+   adc     ($12,x)
+   rra     ($12,x)
+   adc     $12
+   ror     $12
+   rra     $12
+   pla
+   adc     #$12
+   ror     a
+   arr     #$12
+   jmp     ($3456)
+   adc     $3456
+   ror     $3456
+   rra     $3456
+   bvs     *+2
+   adc     ($12),y
+   rra     ($12),y
+   adc     $12,x
+   ror     $12,x
+   rra     $12,x
+   sei
+   adc     $3456,y
+   rra     $3456,y
+   adc     $3456,x
+   ror     $3456,x
+   rra     $3456,x
+   nop     #$12
+   sta     ($12,x)
+   sty     $12
+   sta     $12
+   stx     $12
+   dey
+   txa
+   sty     $3456
+   sta     $3456
+   stx     $3456
+   bcc     *+2
+   sta     ($12),y
+   sty     $12,x
+   sta     $12,x
+   stx     $12,y
+   tya
+   sta     $3456,y
+   txs
+   shy     $3456,x
+   sta     $3456,x
+   shx     $3456,y
+   ldy     #$12
+   lda     ($12,x)
+   ldx     #$12
+   lax     ($12,x)
+   ldy     $12
+   lda     $12
+   ldx     $12
+   lax     $12
+   tay
+   lda     #$12
+   tax
+   lax     #$12
+   ldy     $3456
+   lda     $3456
+   ldx     $3456
+   lax     $3456
+   bcs     *+2
+   lda     ($12),y
+   lax     ($12),y
+   ldy     $12,x
+   lda     $12,x
+   ldx     $12,y
+   lax     $12,y
+   clv
+   lda     $3456,y
+   tsx
+   las     $3456,y
+   ldy     $3456,x
+   lda     $3456,x
+   ldx     $3456,y
+   lax     $3456,y
+   cpy     #$12
+   cmp     ($12,x)
+   cpy     $12
+   cmp     $12
+   dec     $12
+   iny
+   cmp     #$12
+   dex
+   axs     #$12
+   cpy     $3456
+   cmp     $3456
+   dec     $3456
+   bne     *+2
+   cmp     ($12),y
+   cmp     $12,x
+   dec     $12,x
+   cld
+   cmp     $3456,y
+   cmp     $3456,x
+   dec     $3456,x
+   cpx     #$12
+   sbc     ($12,x)
+   cpx     $12
+   sbc     $12
+   inc     $12
+   inx
+   sbc     #$12
+   nop
+   cpx     $3456
+   sbc     $3456
+   inc     $3456
+   beq     *+2
+   sbc     ($12),y
+   sbc     $12,x
+   inc     $12,x
+   sed
+   sbc     $3456,y
+   sbc     $3456,x
+   inc     $3456,x
diff --git a/test/dasm/6502X-disass.s b/test/dasm/6502X-disass.s
new file mode 100644
index 000000000..f102144c4
--- /dev/null
+++ b/test/dasm/6502X-disass.s
@@ -0,0 +1,30 @@
+
+    .setcpu "6502X"
+
+    .repeat 256, cnt
+
+    ; generate a pattern with all opcodes. however, for the full cycle to work,
+    ; we must take care of the "duplicate" opcodes, ie use only the favourite one.
+    .if ((cnt & $0f) = $02)
+    .byte $02   ; all JAM
+    .elseif ((cnt & $1f) = $1a)
+    .byte $ea   ; all NOP
+    .elseif (cnt = $2b)
+    .byte $0b   ; both ANC #imm
+    .elseif (cnt = $89)
+    .byte $80   ; both NOP #imm
+    .elseif (cnt = $eb)
+    .byte $e9   ; both SBC #imm
+    .elseif (cnt = $34) || (cnt = $54) ||  (cnt = $74) ||  (cnt = $d4) || (cnt = $f4)
+    .byte $14   ; all NOP zp, x
+    .elseif (cnt = $3c) || (cnt = $5c) ||  (cnt = $7c) ||  (cnt = $dc) || (cnt = $fc)
+    .byte $1c   ; all NOP abs, x
+    .elseif (cnt = $44) || (cnt = $64)
+    .byte $04   ; all NOP zp
+    .else
+    .byte cnt
+    .endif
+
+    .byte $02, $ea, $00
+
+    .endrepeat
diff --git a/test/dasm/65C02-disass.s b/test/dasm/65C02-disass.s
new file mode 100644
index 000000000..0613921d5
--- /dev/null
+++ b/test/dasm/65C02-disass.s
@@ -0,0 +1,214 @@
+.setcpu "65C02"
+
+   brk
+   ora     ($12,x)
+   tsb     $12
+   ora     $12
+   asl     $12
+   rmb0    $12
+   php
+   ora     #$12
+   asl     a
+   tsb     $3456
+   ora     $3456
+   asl     $3456
+   bbr0    $12,*+2
+   bpl     *+2
+   ora     ($12),y
+   ora     ($12)
+   trb     $12
+   ora     $12,x
+   asl     $12,x
+   rmb1    $12
+   clc
+   ora     $3456,y
+   inc     a
+   trb     $3456
+   ora     $3456,x
+   asl     $3456,x
+   bbr1    $12,*+2
+   jsr     $3456
+   and     ($12,x)
+   bit     $12
+   and     $12
+   rol     $12
+   rmb2    $12
+   plp
+   and     #$12
+   rol     a
+   bit     $3456
+   and     $3456
+   rol     $3456
+   bbr2    $12,*+2
+   bmi     *+2
+   and     ($12),y
+   and     ($12)
+   bit     $12,x
+   and     $12,x
+   rol     $12,x
+   rmb3    $12
+   sec
+   and     $3456,y
+   dec     a
+   bit     $3456,x
+   and     $3456,x
+   rol     $3456,x
+   bbr3    $12,*+2
+   rti
+   eor     ($12,x)
+   eor     $12
+   lsr     $12
+   rmb4    $12
+   pha
+   eor     #$12
+   lsr     a
+   jmp     $3456
+   eor     $3456
+   lsr     $3456
+   bbr4    $12,*+2
+   bvc     *+2
+   eor     ($12),y
+   eor     ($12)
+   eor     $12,x
+   lsr     $12,x
+   rmb5    $12
+   cli
+   eor     $3456,y
+   phy
+   eor     $3456,x
+   lsr     $3456,x
+   bbr5    $12,*+2
+   rts
+   adc     ($12,x)
+   stz     $12
+   adc     $12
+   ror     $12
+   rmb6    $12
+   pla
+   adc     #$12
+   ror     a
+   jmp     ($3456)
+   adc     $3456
+   ror     $3456
+   bbr6    $12,*+2
+   bvs     *+2
+   adc     ($12),y
+   adc     ($12)
+   stz     $12,x
+   adc     $12,x
+   ror     $12,x
+   rmb7    $12
+   sei
+   adc     $3456,y
+   ply
+   jmp     ($3456,x)
+   adc     $3456,x
+   ror     $3456,x
+   bbr7    $12,*+2
+   bra     *+2
+   sta     ($12,x)
+   sty     $12
+   sta     $12
+   stx     $12
+   smb0    $12
+   dey
+   bit     #$12
+   txa
+   sty     $3456
+   sta     $3456
+   stx     $3456
+   bbs0    $12,*+2
+   bcc     *+2
+   sta     ($12),y
+   sta     ($12)
+   sty     $12,x
+   sta     $12,x
+   stx     $12,y
+   smb1    $12
+   tya
+   sta     $3456,y
+   txs
+   stz     $3456
+   sta     $3456,x
+   stz     $3456,x
+   bbs1    $12,*+2
+   ldy     #$12
+   lda     ($12,x)
+   ldx     #$12
+   ldy     $12
+   lda     $12
+   ldx     $12
+   smb2    $12
+   tay
+   lda     #$12
+   tax
+   ldy     $3456
+   lda     $3456
+   ldx     $3456
+   bbs2    $12,*+2
+   bcs     *+2
+   lda     ($12),y
+   lda     ($12)
+   ldy     $12,x
+   lda     $12,x
+   ldx     $12,y
+   smb3    $12
+   clv
+   lda     $3456,y
+   tsx
+   ldy     $3456,x
+   lda     $3456,x
+   ldx     $3456,y
+   bbs3    $12,*+2
+   cpy     #$12
+   cmp     ($12,x)
+   cpy     $12
+   cmp     $12
+   dec     $12
+   smb4    $12
+   iny
+   cmp     #$12
+   dex
+   cpy     $3456
+   cmp     $3456
+   dec     $3456
+   bbs4    $12,*+2
+   bne     *+2
+   cmp     ($12),y
+   cmp     ($12)
+   cmp     $12,x
+   dec     $12,x
+   smb5    $12
+   cld
+   cmp     $3456,y
+   phx
+   cmp     $3456,x
+   dec     $3456,x
+   bbs5    $12,*+2
+   cpx     #$12
+   sbc     ($12,x)
+   cpx     $12
+   sbc     $12
+   inc     $12
+   smb6    $12
+   inx
+   sbc     #$12
+   nop
+   cpx     $3456
+   sbc     $3456
+   inc     $3456
+   bbs6    $12,*+2
+   beq     *+2
+   sbc     ($12),y
+   sbc     ($12)
+   sbc     $12,x
+   inc     $12,x
+   smb7    $12
+   sed
+   sbc     $3456,y
+   plx
+   sbc     $3456,x
+   inc     $3456,x
+L0:
+   bbs7    $12,L0
+   nop
diff --git a/test/dasm/65SC02-disass.s b/test/dasm/65SC02-disass.s
new file mode 100644
index 000000000..46e96aaf9
--- /dev/null
+++ b/test/dasm/65SC02-disass.s
@@ -0,0 +1,181 @@
+.setcpu "65SC02"
+
+   brk
+   ora     ($12,x)
+   tsb     $12
+   ora     $12
+   asl     $12
+   php
+   ora     #$12
+   asl     a
+   tsb     $3456
+   ora     $3456
+   asl     $3456
+   bpl     *+2
+   ora     ($12),y
+   ora     ($12)
+   trb     $12
+   ora     $12,x
+   asl     $12,x
+   clc
+   ora     $3456,y
+   inc     a
+   trb     $3456
+   ora     $3456,x
+   asl     $3456,x
+   jsr     $3456
+   and     ($12,x)
+   bit     $12
+   and     $12
+   rol     $12
+   plp
+   and     #$12
+   rol     a
+   bit     $3456
+   and     $3456
+   rol     $3456
+   bmi     *+2
+   and     ($12),y
+   and     ($12)
+   bit     $12,x
+   and     $12,x
+   rol     $12,x
+   sec
+   and     $3456,y
+   dec     a
+   bit     $3456,x
+   and     $3456,x
+   rol     $3456,x
+   rti
+   eor     ($12,x)
+   eor     $12
+   lsr     $12
+   pha
+   eor     #$12
+   lsr     a
+   jmp     $3456
+   eor     $3456
+   lsr     $3456
+   bvc     *+2
+   eor     ($12),y
+   eor     ($12)
+   eor     $12,x
+   lsr     $12,x
+   cli
+   eor     $3456,y
+   phy
+   eor     $3456,x
+   lsr     $3456,x
+   rts
+   adc     ($12,x)
+   stz     $12
+   adc     $12
+   ror     $12
+   pla
+   adc     #$12
+   ror     a
+   jmp     ($3456)
+   adc     $3456
+   ror     $3456
+   bvs     *+2
+   adc     ($12),y
+   adc     ($12)
+   stz     $12,x
+   adc     $12,x
+   ror     $12,x
+   sei
+   adc     $3456,y
+   ply
+   jmp     ($3456,x)
+   adc     $3456,x
+   ror     $3456,x
+   bra     *+2
+   sta     ($12,x)
+   sty     $12
+   sta     $12
+   stx     $12
+   dey
+   bit     #$12
+   txa
+   sty     $3456
+   sta     $3456
+   stx     $3456
+   bcc     *+2
+   sta     ($12),y
+   sta     ($12)
+   sty     $12,x
+   sta     $12,x
+   stx     $12,y
+   tya
+   sta     $3456,y
+   txs
+   stz     $3456
+   sta     $3456,x
+   stz     $3456,x
+   ldy     #$12
+   lda     ($12,x)
+   ldx     #$12
+   ldy     $12
+   lda     $12
+   ldx     $12
+   tay
+   lda     #$12
+   tax
+   ldy     $3456
+   lda     $3456
+   ldx     $3456
+   bcs     *+2
+   lda     ($12),y
+   lda     ($12)
+   ldy     $12,x
+   lda     $12,x
+   ldx     $12,y
+   clv
+   lda     $3456,y
+   tsx
+   ldy     $3456,x
+   lda     $3456,x
+   ldx     $3456,y
+   cpy     #$12
+   cmp     ($12,x)
+   cpy     $12
+   cmp     $12
+   dec     $12
+   iny
+   cmp     #$12
+   dex
+   cpy     $3456
+   cmp     $3456
+   dec     $3456
+   bne     *+2
+   cmp     ($12),y
+   cmp     ($12)
+   cmp     $12,x
+   dec     $12,x
+   cld
+   cmp     $3456,y
+   phx
+   cmp     $3456,x
+   dec     $3456,x
+   cpx     #$12
+   sbc     ($12,x)
+   cpx     $12
+   sbc     $12
+   inc     $12
+   inx
+   sbc     #$12
+   nop
+   cpx     $3456
+   sbc     $3456
+   inc     $3456
+   beq     *+2
+   sbc     ($12),y
+   sbc     ($12)
+   sbc     $12,x
+   inc     $12,x
+   sed
+   sbc     $3456,y
+   plx
+   sbc     $3456,x
+   inc     $3456,x
+
diff --git a/test/dasm/huc6280-disass.s b/test/dasm/huc6280-disass.s
new file mode 100644
index 000000000..4ae7b067d
--- /dev/null
+++ b/test/dasm/huc6280-disass.s
@@ -0,0 +1,250 @@
+.setcpu "huc6280"
+
+   brk
+   ora     ($12,x)
+   sxy
+   st0     #$12
+   tsb     $12
+   ora     $12
+   asl     $12
+   rmb0    $12
+   php
+   ora     #$12
+   asl     a
+   tsb     $3456
+   ora     $3456
+   asl     $3456
+   bbr0    $12,L0
+L0:
+   bpl     *+2
+   ora     ($12),y
+   ora     ($12)
+   st1     #$12
+   trb     $12
+   ora     $12,x
+   asl     $12,x
+   rmb1    $12
+   clc
+   ora     $3456,y
+   inc     a
+   trb     $3456
+   ora     $3456,x
+   asl     $3456,x
+   bbr1    $12,L1
+L1:
+   jsr     $3456
+   and     ($12,x)
+   sax
+   st2     #$12
+   bit     $12
+   and     $12
+   rol     $12
+   rmb2    $12
+   plp
+   and     #$12
+   rol     a
+   bit     $3456
+   and     $3456
+   rol     $3456
+   bbr2    $12,L2
+L2:
+   bmi     *+2
+   and     ($12),y
+   and     ($12)
+   bit     $12,x
+   and     $12,x
+   rol     $12,x
+   rmb3    $12
+   sec
+   and     $3456,y
+   dec     a
+   bit     $3456,x
+   and     $3456,x
+   rol     $3456,x
+   bbr3    $12,L3
+L3:
+   rti
+   eor     ($12,x)
+   say
+   tma     #$02
+   bsr     *+2
+   eor     $12
+   lsr     $12
+   rmb4    $12
+   pha
+   eor     #$12
+   lsr     a
+   jmp     $3456
+   eor     $3456
+   lsr     $3456
+   bbr4    $12,L4
+L4:
+   bvc     *+2
+   eor     ($12),y
+   eor     ($12)
+   tam     #$12
+   csl
+   eor     $12,x
+   lsr     $12,x
+   rmb5    $12
+   cli
+   eor     $3456,y
+   phy
+   eor     $3456,x
+   lsr     $3456,x
+   bbr5    $12,L5
+L5:
+   rts
+   adc     ($12,x)
+   cla
+   stz     $12
+   adc     $12
+   ror     $12
+   rmb6    $12
+   pla
+   adc     #$12
+   ror     a
+   jmp     ($3456)
+   adc     $3456
+   ror     $3456
+   bbr6    $12,L6
+L6:
+   bvs     *+2
+   adc     ($12),y
+   adc     ($12)
+   tii     $3333,$7373,$1111
+   stz     $12,x
+   adc     $12,x
+   ror     $12,x
+   rmb7    $12
+   sei
+   adc     $3456,y
+   ply
+   jmp     ($3456,x)
+   adc     $3456,x
+   ror     $3456,x
+   bbr7    $12,L7
+L7:
+   bra     *+2
+   sta     ($12,x)
+   clx
+   tst     #$12,$EA
+   sty     $12
+   sta     $12
+   stx     $12
+   smb0    $12
+   dey
+   bit     #$12
+   txa
+   sty     $3456
+   sta     $3456
+   stx     $3456
+   bbs0    $12,LS0
+LS0:
+   bcc     *+2
+   sta     ($12),y
+   sta     ($12)
+   tst     #$12,$EAEA
+   sty     $12,x
+   sta     $12,x
+   stx     $12,y
+   smb1    $12
+   tya
+   sta     $3456,y
+   txs
+   stz     $3456
+   sta     $3456,x
+   stz     $3456,x
+   bbs1    $12,LS1
+LS1:
+   ldy     #$12
+   lda     ($12,x)
+   ldx     #$12
+   tst     #$12,$EA,x
+   ldy     $12
+   lda     $12
+   ldx     $12
+   smb2    $12
+   tay
+   lda     #$12
+   tax
+   ldy     $3456
+   lda     $3456
+   ldx     $3456
+   bbs2    $12,LS2
+LS2:
+   bcs     *+2
+   lda     ($12),y
+   lda     ($12)
+   tst     #$12,$EAEA,x
+   ldy     $12,x
+   lda     $12,x
+   ldx     $12,y
+   smb3    $12
+   clv
+   lda     $3456,y
+   tsx
+   ldy     $3456,x
+   lda     $3456,x
+   ldx     $3456,y
+   bbs3    $12,LS3
+LS3:
+   cpy     #$12
+   cmp     ($12,x)
+   cly
+   tdd     $3333,$C3C3,$1111
+   cpy     $12
+   cmp     $12
+   dec     $12
+   smb4    $12
+   iny
+   cmp     #$12
+   dex
+   cpy     $3456
+   cmp     $3456
+   dec     $3456
+   bbs4    $12,LS4
+LS4:
+   bne     *+2
+   cmp     ($12),y
+   cmp     ($12)
+   tin     $3333,$D3D3,$1111
+   cmp     $12,x
+   dec     $12,x
+   smb5    $12
+   cld
+   cmp     $3456,y
+   phx
+   cmp     $3456,x
+   dec     $3456,x
+   bbs5    $12,LS5
+LS5:
+   cpx     #$12
+   sbc     ($12,x)
+   tia     $3333,$E3E3,$1111
+   cpx     $12
+   sbc     $12
+   inc     $12
+   smb6    $12
+   inx
+   sbc     #$12
+   nop
+   cpx     $3456
+   sbc     $3456
+   inc     $3456
+   bbs6    $12,LS6
+LS6:
+   beq     *+2
+   sbc     ($12),y
+   sbc     ($12)
+   tai     $3333,$F3F3,$1111
+   sbc     $12,x
+   inc     $12,x
+   smb7    $12
+   sed
+   sbc     $3456,y
+   plx
+   sbc     $3456,x
+   inc     $3456,x
+LS7:
+   bbs7    $12,LS7
diff --git a/test/dasm/m740-disass.s b/test/dasm/m740-disass.s
new file mode 100644
index 000000000..ea0f19f8d
--- /dev/null
+++ b/test/dasm/m740-disass.s
@@ -0,0 +1,8 @@
+
+    .setcpu "M740"
+
+    .repeat 256, cnt
+
+    .byte 0 + cnt, $12, $02, $ea
+
+    .endrepeat
diff --git a/test/dasm/readme.txt b/test/dasm/readme.txt
new file mode 100644
index 000000000..9e001ec8c
--- /dev/null
+++ b/test/dasm/readme.txt
@@ -0,0 +1,9 @@
+
+Per CPU, a test binary is produced (using the assembler), which should contain
+all possible instructions. That file is then disassembled, and assembled again,
+and finally the resulting binary compared with the binary produced in the first
+step.
+
+Given that we assume the assembler works (this is tested in other/previous
+tests), this proves that the disassembler works, and can produce output that the
+assembler will understand - and produce an identical binary from.