diff --git a/testing/cpus/std.a b/testing/cpus/std.a
new file mode 100644
index 0000000..c9726fa
--- /dev/null
+++ b/testing/cpus/std.a
@@ -0,0 +1,153 @@
+;ACME 0.97
+	; all the standard 6502 instructions:
+		brk		; 00
+		ora ($01, x)	; 01
+		ora $05		; 05
+		asl $05		; 06
+		php		; 08
+		ora #$09	; 09
+		asl		; 0a
+		ora $0d0e	; 0d
+		asl $0d0e	; 0e
+		bpl * + 2	; 10
+		ora ($11), y	; 11
+		ora $15, x	; 15
+		asl $15, x	; 16
+		clc		; 18
+		ora $1919, y	; 19
+		ora $1d1e, x	; 1d
+		asl $1d1e, x	; 1e
+		jsr $0d0e	; 20
+		and ($01, x)	; 21
+		bit $05		; 24
+		and $05		; 25
+		rol $05		; 26
+		plp		; 28
+		and #$09	; 29
+		rol		; 2a
+		bit $0d0e	; 2c
+		and $0d0e	; 2d
+		rol $0d0e	; 2e
+		bmi * + 2	; 30
+		and ($11), y	; 31
+		and $15, x	; 35
+		rol $15, x	; 36
+		sec		; 38
+		and $1919, y	; 39
+		and $1d1e, x	; 3d
+		rol $1d1e, x	; 3e
+		rti		; 40
+		eor ($01, x)	; 41
+		eor $05		; 45
+		lsr $05		; 46
+		pha		; 48
+		eor #$09	; 49
+		lsr		; 4a
+		jmp $0d0e	; 4c
+		eor $0d0e	; 4d
+		lsr $0d0e	; 4e
+		bvc * + 2	; 50
+		eor ($11), y	; 51
+		eor $15, x	; 55
+		lsr $15, x	; 56
+		cli		; 58
+		eor $1919, y	; 59
+		eor $1d1e, x	; 5d
+		lsr $1d1e, x	; 5e
+		rts		; 60
+		adc ($01, x)	; 61
+		adc $05		; 65
+		ror $05		; 66
+		pla		; 68
+		adc #$09	; 69
+		ror		; 6a
+		jmp ($6c6c)	; 6c
+		adc $0d0e	; 6d
+		ror $0d0e	; 6e
+		bvs * + 2	; 70
+		adc ($11), y	; 71
+		adc $15, x	; 75
+		ror $15, x	; 76
+		sei		; 78
+		adc $1919, y	; 79
+		adc $1d1e, x	; 7d
+		ror $1d1e, x	; 7e
+		sta ($01, x)	; 81
+		sty $05		; 84
+		sta $05		; 85
+		stx $05		; 86
+		dey		; 88
+		txa		; 8a
+		sty $0d0e	; 8c
+		sta $0d0e	; 8d
+		stx $0d0e	; 8e
+		bcc * + 2	; 90
+		sta ($11), y	; 91
+		sty $15, x	; 94
+		sta $15, x	; 95
+		stx $96, y	; 96
+		tya		; 98
+		sta $1919, y	; 99
+		txs		; 9a
+		sta $1d1e, x	; 9d
+		ldy #$09	; a0
+		lda ($01, x)	; a1
+		ldx #$09	; a2
+		ldy $05		; a4
+		lda $05		; a5
+		ldx $05		; a6
+		tay		; a8
+		lda #$09	; a9
+		tax		; aa
+		ldy $0d0e	; ac
+		lda $0d0e	; ad
+		ldx $0d0e	; ae
+		bcs * + 2	; b0
+		lda ($11), y	; b1
+		ldy $15, x	; b4
+		lda $15, x	; b5
+		ldx $96, y	; b6
+		clv		; b8
+		lda $1919, y	; b9
+		tsx		; ba
+		ldy $1d1e, x	; bc
+		lda $1d1e, x	; bd
+		ldx $1919, y	; be
+		cpy #$09	; c0
+		cmp ($01, x)	; c1
+		cpy $05		; c4
+		cmp $05		; c5
+		dec $05		; c6
+		iny		; c8
+		cmp #$09	; c9
+		dex		; ca
+		cpy $0d0e	; cc
+		cmp $0d0e	; cd
+		dec $0d0e	; ce
+		bne * + 2	; d0
+		cmp ($11), y	; d1
+		cmp $15, x	; d5
+		dec $15, x	; d6
+		cld		; d8
+		cmp $1919, y	; d9
+		cmp $1d1e, x	; dd
+		dec $1d1e, x	; de
+		cpx #$09	; e0
+		sbc ($01, x)	; e1
+		cpx $05		; e4
+		sbc $05		; e5
+		inc $05		; e6
+		inx		; e8
+		sbc #$09	; e9
+		nop		; ea
+		cpx $0d0e	; ec
+		sbc $0d0e	; ed
+		inc $0d0e	; ee
+		beq * + 2	; f0
+		sbc ($11), y	; f1
+		sbc $15, x	; f5
+		inc $15, x	; f6
+		sed		; f8
+		sbc $1919, y	; f9
+		sbc $1d1e, x	; fd
+		inc $1d1e, x	; fe
diff --git a/testing/cpus/test-6502.a b/testing/cpus/test-6502.a
new file mode 100644
index 0000000..3ac4c09
--- /dev/null
+++ b/testing/cpus/test-6502.a
@@ -0,0 +1,5 @@
+;ACME 0.97
+	!cpu 6502
+	!to "out-6502.o", plain
+	*=$1000
+	!src "std.a"
diff --git a/testing/cpus/test-nmos6502.a b/testing/cpus/test-nmos6502.a
new file mode 100644
index 0000000..619d1e0
--- /dev/null
+++ b/testing/cpus/test-nmos6502.a
@@ -0,0 +1,76 @@
+;ACME 0.97
+	!cpu nmos6502
+	!to "out-nmos6502.o", plain
+	*=$1000
+	!src "std.a"
+; nmos6502 additions:
+		jam		; 02
+		slo ($03, x)	; 03
+		nop $04		; 04
+		slo $04		; 07
+		anc #$0b	; 0b
+		nop $0c0f	; 0c
+		slo $0c0f	; 0f
+		slo ($13), y	; 13
+		nop $14, x	; 14
+		slo $14, x	; 17
+		slo $1b1b, y	; 1b
+		nop $1c1f, x	; 1c
+		slo $1c1f, x	; 1f
+		rla ($03, x)	; 23
+		rla $04		; 27
+		rla $0c0f	; 2f
+		rla ($13), y	; 33
+		rla $14, x	; 37
+		rla $1b1b, y	; 3b
+		rla $1c1f, x	; 3f
+		sre ($03, x)	; 43
+		sre $04	; 47
+		asr #$0b	; 4b
+		sre $0c0f	; 4f
+		sre ($13), y	; 53
+		sre $14, x	; 57
+		sre $1b1b, y	; 5b
+		sre $1c1f, x	; 5f
+		rra ($03, x)	; 63
+		rra $04	; 67
+		arr #$0b	; 6b
+		rra $0c0f	; 6f
+		rra ($13), y	; 73
+		rra $14, x	; 77
+		rra $1b1b, y	; 7b
+		rra $1c1f, x	; 7f
+		nop #$0b	; 80
+		sax ($03, x)	; 83
+		sax $04	; 87
+		ane #0		; 8b (anything non-zero gives a warning)
+		sax $0c0f	; 8f
+		sha ($13), y	; 93
+		sax $97, y	; 97
+		tas $1b1b, y	; 9b
+		shy $1c1f, x	; 9c
+		shx $1b1b, y	; 9e
+		sha $1b1b, y	; 9f
+		lax ($03, x)	; a3
+		lax $04	; a7
+		lxa #0		; ab (anything non-zero gives a warning)
+		lax $0c0f	; af
+		lax ($13), y	; b3
+		lax $97, y	; b7
+		las $1b1b, y	; bb
+		lax $1b1b, y	; bf
+		dcp ($03, x)	; c3
+		dcp $04	; c7
+		sbx #$0b	; cb
+		dcp $0c0f	; cf
+		dcp ($13), y	; d3
+		dcp $14, x	; d7
+		dcp $1b1b, y	; db
+		dcp $1c1f, x	; df
+		isc ($03, x)	; e3
+		isc $04	; e7
+		isc $0c0f	; ef
+		isc ($13), y	; f3
+		isc $14, x	; f7
+		isc $1b1b, y	; fb
+		isc $1c1f, x	; ff
diff --git a/testing/warnings/binlen.a b/testing/warnings/binlen.a
new file mode 100644
index 0000000..86a5f3e
--- /dev/null
+++ b/testing/warnings/binlen.a
@@ -0,0 +1,4 @@
+;ACME 0.97
+	a = %........	; eight digits
+	a = %.......
+	a = %.........