From 202a2d677b46832513fe95107abf92efa3a53488 Mon Sep 17 00:00:00 2001
From: mrdudz <mrdudz@users.noreply.github.com>
Date: Wed, 19 Nov 2014 22:04:32 +0100
Subject: [PATCH] starting branch for adding the missing undocumented opcodes

---
 src/ca65/instr.c              |   2 +-
 testcode/assembler/.gitignore |   2 +
 testcode/assembler/Makefile   |  19 +++
 testcode/assembler/all.s      | 255 ++++++++++++++++++++++++++++++++++
 testcode/assembler/illegal.s  | 153 ++++++++++++++++----
 testcode/assembler/legal.ref  | Bin 0 -> 321 bytes
 testcode/assembler/legal.s    | 184 ++++++++++++++++++++++++
 7 files changed, 584 insertions(+), 31 deletions(-)
 create mode 100644 testcode/assembler/.gitignore
 create mode 100644 testcode/assembler/Makefile
 create mode 100644 testcode/assembler/all.s
 create mode 100644 testcode/assembler/legal.ref
 create mode 100644 testcode/assembler/legal.s

diff --git a/src/ca65/instr.c b/src/ca65/instr.c
index c2482577c..9270f5601 100644
--- a/src/ca65/instr.c
+++ b/src/ca65/instr.c
@@ -783,7 +783,7 @@ static const InsTable* InsTabs[CPU_COUNT] = {
 const InsTable* InsTab = (const InsTable*) &InsTab6502;
 
 /* Table to build the effective 65xx opcode from a base opcode and an
-** addressing mode.
+** addressing mode. (The value in the table is ORed with the base opcode)
 */
 static unsigned char EATab[10][AM65I_COUNT] = {
     {   /* Table 0 */
diff --git a/testcode/assembler/.gitignore b/testcode/assembler/.gitignore
new file mode 100644
index 000000000..160ca9ba4
--- /dev/null
+++ b/testcode/assembler/.gitignore
@@ -0,0 +1,2 @@
+chkillegal.bin
+chklegal.bin
diff --git a/testcode/assembler/Makefile b/testcode/assembler/Makefile
new file mode 100644
index 000000000..ae08864f8
--- /dev/null
+++ b/testcode/assembler/Makefile
@@ -0,0 +1,19 @@
+
+all: chklegal.bin chkillegal.bin
+	@#
+
+.PHONY: chklegal.bin chkillegal.bin
+
+chklegal.bin: legal.s
+	../../bin/cl65 --target none --cpu 6502X -o chklegal.bin legal.s
+	diff legal.ref chklegal.bin
+
+chkillegal.bin: illegal.s
+	../../bin/cl65 --target none --cpu 6502X -o chkillegal.bin illegal.s
+
+ref: legal.s
+	../../bin/cl65 --target none --cpu 6502X -o legal.ref legal.s
+
+clean:
+	rm -f legal.o chklegal.bin
+	rm -f illegal.o chkillegal.bin
diff --git a/testcode/assembler/all.s b/testcode/assembler/all.s
new file mode 100644
index 000000000..5471a2bb1
--- /dev/null
+++ b/testcode/assembler/all.s
@@ -0,0 +1,255 @@
+            brk                 ; 00
+            ora ($12,x)         ; 01 12
+            jam                 ; 02
+            slo ($12,x)         ; 03 12
+            noop $12            ; 04 12
+            ora $12             ; 05 12
+            asl $12             ; 06 12
+            slo $12             ; 07 12
+            php                 ; 08
+            ora #$12            ; 09 12
+            asl a               ; 0a
+            anc #$12            ; 0b 12
+            noop $1234          ; 0c 34 12
+            ora $1234           ; 0d 34 12
+            asl $1234           ; 0e 34 12
+            slo $1234           ; 0f 34 12
+            bpl $101c           ; 10 12
+            ora ($12),y         ; 11 12
+            jam                 ; 12
+            slo ($12),y         ; 13 12
+            noop $12,x          ; 14 12
+            ora $12,x           ; 15 12
+            asl $12,x           ; 16 12
+            slo $12,x           ; 17 12
+            clc                 ; 18
+            ora $1234,y         ; 19 34 12
+            noop                ; 1a
+            slo $1234,y         ; 1b 34 12
+            noop $1234,x        ; 1c 34 12
+            ora $1234,x         ; 1d 34 12
+            asl $1234,x         ; 1e 34 12
+            slo $1234,x         ; 1f 34 12
+            jsr $1234           ; 20 34 12
+            and ($12,x)         ; 21 12
+            jam                 ; 22
+            rla ($12,x)         ; 23 12
+            bit $12             ; 24 12
+            and $12             ; 25 12
+            rol $12             ; 26 12
+            rla $12             ; 27 12
+            plp                 ; 28
+            and #$12            ; 29 12
+            rol a               ; 2a
+            anc #$12            ; 2b 12
+            bit $1234           ; 2c 34 12
+            and $1234           ; 2d 34 12
+            rol $1234           ; 2e 34 12
+            rla $1234           ; 2f 34 12
+            bmi $107c           ; 30 12
+            and ($12),y         ; 31 12
+            jam                 ; 32
+            rla ($12),y         ; 33 12
+            noop $12,x          ; 34 12
+            and $12,x           ; 35 12
+            rol $12,x           ; 36 12
+            rla $12,x           ; 37 12
+            sec                 ; 38
+            and $1234,y         ; 39 34 12
+            noop                ; 3a
+            rla $1234,y         ; 3b 34 12
+            noop $1234,x        ; 3c 34 12
+            and $1234,x         ; 3d 34 12
+            rol $1234,x         ; 3e 34 12
+            rla $1234,x         ; 3f 34 12
+            rti                 ; 40
+            eor ($12,x)         ; 41 12
+            jam                 ; 42
+            sre ($12,x)         ; 43 12
+            noop $12            ; 44 12
+            eor $12             ; 45 12
+            lsr $12             ; 46 12
+            sre $12             ; 47 12
+            pha                 ; 48
+            eor #$12            ; 49 12
+            lsr a               ; 4a
+            asr #$12            ; 4b 12
+            jmp $1234           ; 4c 34 12
+            eor $1234           ; 4d 34 12
+            lsr $1234           ; 4e 34 12
+            sre $1234           ; 4f 34 12
+            bvc $10dc           ; 50 12
+            eor ($12),y         ; 51 12
+            jam                 ; 52
+            sre ($12),y         ; 53 12
+            noop $12,x          ; 54 12
+            eor $12,x           ; 55 12
+            lsr $12,x           ; 56 12
+            sre $12,x           ; 57 12
+            cli                 ; 58
+            eor $1234,y         ; 59 34 12
+            noop                ; 5a
+            sre $1234,y         ; 5b 34 12
+            noop $1234,x        ; 5c 34 12
+            eor $1234,x         ; 5d 34 12
+            lsr $1234,x         ; 5e 34 12
+            sre $1234,x         ; 5f 34 12
+            rts                 ; 60
+            adc ($12,x)         ; 61 12
+            jam                 ; 62
+            rra ($12,x)         ; 63 12
+            noop $12            ; 64 12
+            adc $12             ; 65 12
+            ror $12             ; 66 12
+            rra $12             ; 67 12
+            pla                 ; 68
+            adc #$12            ; 69 12
+            ror a               ; 6a
+            arr #$12            ; 6b 12
+            jmp ($1234)         ; 6c 34 12
+            adc $1234           ; 6d 34 12
+            ror $1234           ; 6e 34 12
+            rra $1234           ; 6f 34 12
+            bvs $113c           ; 70 12
+            adc ($12),y         ; 71 12
+            jam                 ; 72
+            rra ($12),y         ; 73 12
+            noop $12,x          ; 74 12
+            adc $12,x           ; 75 12
+            ror $12,x           ; 76 12
+            rra $12,x           ; 77 12
+            sei                 ; 78
+            adc $1234,y         ; 79 34 12
+            noop                ; 7a
+            rra $1234,y         ; 7b 34 12
+            noop $1234,x        ; 7c 34 12
+            adc $1234,x         ; 7d 34 12
+            ror $1234,x         ; 7e 34 12
+            rra $1234,x         ; 7f 34 12
+            noop #$12           ; 80 12
+            sta ($12,x)         ; 81 12
+            noop #$12           ; 82 12
+            sax ($12,x)         ; 83 12
+            sty $12             ; 84 12
+            sta $12             ; 85 12
+            stx $12             ; 86 12
+            sax $12             ; 87 12
+            dey                 ; 88
+            noop #$12           ; 89 12
+            txa                 ; 8a
+            ane #$12            ; 8b 12
+            sty $1234           ; 8c 34 12
+            sta $1234           ; 8d 34 12
+            stx $1234           ; 8e 34 12
+            sax $1234           ; 8f 34 12
+            bcc $119c           ; 90 12
+            sta ($12),y         ; 91 12
+            jam                 ; 92
+            sha ($12),y         ; 93 12
+            sty $12,x           ; 94 12
+            sta $12,x           ; 95 12
+            stx $12,y           ; 96 12
+            sax $12,y           ; 97 12
+            tya                 ; 98
+            sta $1234,y         ; 99 34 12
+            txs                 ; 9a
+            shs $1234,y         ; 9b 34 12
+            shy $1234,x         ; 9c 34 12
+            sta $1234,x         ; 9d 34 12
+            shx $1234,y         ; 9e 34 12
+            sha $1234,y         ; 9f 34 12
+            ldy #$12            ; a0 12
+            lda ($12,x)         ; a1 12
+            ldx #$12            ; a2 12
+            lax ($12,x)         ; a3 12
+            ldy $12             ; a4 12
+            lda $12             ; a5 12
+            ldx $12             ; a6 12
+            lax $12             ; a7 12
+            tay                 ; a8
+            lda #$12            ; a9 12
+            tax                 ; aa
+            lxa #$12            ; ab 12
+            ldy $1234           ; ac 34 12
+            lda $1234           ; ad 34 12
+            ldx $1234           ; ae 34 12
+            lax $1234           ; af 34 12
+            bcs $11fc           ; b0 12
+            lda ($12),y         ; b1 12
+            jam                 ; b2
+            lax ($12),y         ; b3 12
+            ldy $12,x           ; b4 12
+            lda $12,x           ; b5 12
+            ldx $12,y           ; b6 12
+            lax $12,y           ; b7 12
+            clv                 ; b8
+            lda $1234,y         ; b9 34 12
+            tsx                 ; ba
+            las $1234,y         ; bb 34 12
+            ldy $1234,x         ; bc 34 12
+            lda $1234,x         ; bd 34 12
+            ldx $1234,y         ; be 34 12
+            lax $1234,y         ; bf 34 12
+            cpy #$12            ; c0 12
+            cmp ($12,x)         ; c1 12
+            noop #$12           ; c2 12
+            dcp ($12,x)         ; c3 12
+            cpy $12             ; c4 12
+            cmp $12             ; c5 12
+            dec $12             ; c6 12
+            dcp $12             ; c7 12
+            iny                 ; c8
+            cmp #$12            ; c9 12
+            dex                 ; ca
+            sbx #$12            ; cb 12
+            cpy $1234           ; cc 34 12
+            cmp $1234           ; cd 34 12
+            dec $1234           ; ce 34 12
+            dcp $1234           ; cf 34 12
+            bne $125c           ; d0 12
+            cmp ($12),y         ; d1 12
+            jam                 ; d2
+            dcp ($12),y         ; d3 12
+            noop $12,x          ; d4 12
+            cmp $12,x           ; d5 12
+            dec $12,x           ; d6 12
+            dcp $12,x           ; d7 12
+            cld                 ; d8
+            cmp $1234,y         ; d9 34 12
+            noop                ; da
+            dcp $1234,y         ; db 34 12
+            noop $1234,x        ; dc 34 12
+            cmp $1234,x         ; dd 34 12
+            dec $1234,x         ; de 34 12
+            dcp $1234,x         ; df 34 12
+            cpx #$12            ; e0 12
+            sbc ($12,x)         ; e1 12
+            noop #$12           ; e2 12
+            isb ($12,x)         ; e3 12
+            cpx $12             ; e4 12
+            sbc $12             ; e5 12
+            inc $12             ; e6 12
+            isb $12             ; e7 12
+            inx                 ; e8
+            sbc #$12            ; e9 12
+            nop                 ; ea
+            usbc #$12           ; eb 12
+            cpx $1234           ; ec 34 12
+            sbc $1234           ; ed 34 12
+            inc $1234           ; ee 34 12
+            isb $1234           ; ef 34 12
+            beq $12bc           ; f0 12
+            sbc ($12),y         ; f1 12
+            jam                 ; f2
+            isb ($12),y         ; f3 12
+            noop $12,x          ; f4 12
+            sbc $12,x           ; f5 12
+            inc $12,x           ; f6 12
+            isb $12,x           ; f7 12
+            sed                 ; f8
+            sbc $1234,y         ; f9 34 12
+            isb $1234,y         ; fb 34 12
+            noop $1234,x        ; fc 34 12
+            sbc $1234,x         ; fd 34 12
+            inc $1234,x         ; fe 34 12
+            isb $1234,x         ; ff 34 12
diff --git a/testcode/assembler/illegal.s b/testcode/assembler/illegal.s
index 53b9ec5b0..5145e31e5 100644
--- a/testcode/assembler/illegal.s
+++ b/testcode/assembler/illegal.s
@@ -1,43 +1,136 @@
 
         .setcpu         "6502X"
 
+; first all totally staple undocs:
 
-.macro  test    opc
+        slo $12             ; 07 12
+        slo $1234           ; 0f 34 12
+        slo $1234,x         ; 1f 34 12
+        slo $1234,y         ; 1b 34 12
+        slo ($12,x)         ; 03 12
+        slo $12,x           ; 17 12
+        slo ($12),y         ; 13 12
 
-        opc     $00
-        opc     $00,x
-        opc     ($00,x)
-        opc     ($00),y
-        opc     $1234
-        opc     $1234,x
-        opc     $1234,y
+        rla $12             ; 27 12
+        rla $1234           ; 2f 34 12
+        rla $1234,x         ; 3f 34 12
+        rla $1234,y         ; 3b 34 12
+        rla ($12,x)         ; 23 12
+        rla $12,x           ; 37 12
+        rla ($12),y         ; 33 12
 
-.endmacro
+        sre $1234           ; 4f 34 12
+        sre $1234,x         ; 5f 34 12
+        sre $1234,y         ; 5b 34 12
+        sre $12             ; 47 12
+        sre ($12,x)         ; 43 12
+        sre $12,x           ; 57 12
+        sre ($12),y         ; 53 12
 
+        rra $1234           ; 6f 34 12
+        rra $1234,x         ; 7f 34 12
+        rra $1234,y         ; 7b 34 12
+        rra $12             ; 67 12
+        rra ($12,x)         ; 63 12
+        rra $12,x           ; 77 12
+        rra ($12),y         ; 73 12
 
-        test    slo
-        test    rla
-        test    sre
-        test    rra
-        test    dcp
-        test    isc
+        dcp $1234           ; cf 34 12
+        dcp $1234,x         ; df 34 12
+        dcp $1234,y         ; db 34 12
+        dcp $12             ; c7 12
+        dcp ($12,x)         ; c3 12
+        dcp $12,x           ; d7 12
+        dcp ($12),y         ; d3 12
 
-        sax     $00
-        sax     $00,y
-        sax     ($00,x)
-        sax     $1234
+        isc $1234           ; ef 34 12
+        isc $1234,x         ; ff 34 12
+        isc $1234,y         ; fb 34 12
+        isc $12             ; e7 12
+        isc ($12,x)         ; e3 12
+        isc $12,x           ; f7 12
+        isc ($12),y         ; f3 12
 
-        lax     $00
-        lax     $00,y
-        lax     ($00,x)
-        lax     ($00),y
-        lax     $1234
-        lax     $1234,y
+        sax $1234           ; 8f 34 12
+        sax $12             ; 87 12
+        sax ($12,x)         ; 83 12
+        sax $12,y           ; 97 12
 
-        anc     #$55
-        alr     #$55
-        arr     #$55
-        axs     #$55
+        lax $1234           ; af 34 12
+        lax $1234,y         ; bf 34 12
+        lax $12             ; a7 12
+        lax ($12,x)         ; a3 12
+        lax ($12),y         ; b3 12
+        lax $12,y           ; b7 12
 
-        las     $1234,y
+
+        anc #$12            ; 0b 12
+        ;anc #$12            ; 2b 12
+
+        arr #$12            ; 6b 12
+
+        alr #$12            ; 4b 12
+
+        axs #$12            ; cb 12
+
+;        nop $12             ; 04 12
+;        nop $1234           ; 0c 34 12
+;        nop $1234,x         ; 1c 34 12
+;        nop $1234,x         ; 3c 34 12
+;        nop $1234,x         ; 5c 34 12
+;        nop $1234,x         ; 7c 34 12
+;        nop $1234,x         ; dc 34 12
+;        nop $1234,x         ; fc 34 12
+;        nop $12             ; 44 12
+;        nop $12             ; 64 12
+;        nop #$12            ; 80 12
+;        nop #$12            ; 82 12
+;        nop #$12            ; 89 12
+;        nop #$12            ; c2 12
+;        nop #$12            ; e2 12
+;        nop $12,x           ; 14 12
+;        nop $12,x           ; 34 12
+;        nop $12,x           ; 54 12
+;        nop $12,x           ; 74 12
+;        nop $12,x           ; d4 12
+;        nop $12,x           ; f4 12
+;        nop                 ; 1a
+;        nop                 ; 3a
+;        nop                 ; 5a
+;        nop                 ; 7a
+;        nop                 ; da
+
+;        jam                 ; 02
+;        jam                 ; 12
+;        jam                 ; 22
+;        jam                 ; 32
+;        jam                 ; 42
+;        jam                 ; 52
+;        jam                 ; 62
+;        jam                 ; 72
+;        jam                 ; 92
+;        jam                 ; b2
+;        jam                 ; d2
+;        jam                 ; f2
+
+        ;sbc #$12           ; eb 12
+
+; and the so called "unstable" ones:
+
+        las $1234,y         ; bb 34 12
+
+;        sha $1234,y         ; 9f 34 12
+;        sha ($12),y         ; 93 12
+
+;        shs $1234,y         ; 9b 34 12
+
+;        shx $1234,y         ; 9e 34 12
+
+;        shy $1234,x         ; 9c 34 12
+
+; the two "highly unstable" ones:
+
+;        lax #$12            ; ab 12
+
+;        ane #$12            ; 8b 12
 
diff --git a/testcode/assembler/legal.ref b/testcode/assembler/legal.ref
new file mode 100644
index 0000000000000000000000000000000000000000..4e9f5c45d9566f2d5e77236c7a2c5319959b5cce
GIT binary patch
literal 321
zcmV~$F(?IK07g*;LecLQF%X3iqCR3E211B|7>I$;BL-ri6p|2yPzoW0D1;D&5Mm$(
zq7Xt1#6Zp|6Lq3i6jDL~RaD|j0Kp<!L<w)g3BwjA;VE2k=rnWY-S`kBLd}UW#wy)Z
z7`Kb;<s)$=F2xS}Y;ndZFXDzf4#g(h9E)qQ%Q*)vsUlb8h<K8SBa;l?#GiQJi^shb
zVG&+pMy!h!F~%grEHclm*bpO(v&6Jm6GM!$K$^%C31pG{Y=b?H!b7+VYg}+9(XQCv
zj}Q?fA_y!O^`eMsN@Me1#jp4g_dIdSCm%$9*R+d4(Jz{4pocCxL^Hj#iAK7anpkZe
G==%pO4_>eU

literal 0
HcmV?d00001

diff --git a/testcode/assembler/legal.s b/testcode/assembler/legal.s
new file mode 100644
index 000000000..379d6cd3a
--- /dev/null
+++ b/testcode/assembler/legal.s
@@ -0,0 +1,184 @@
+            adc $1234           ; 6d 34 12
+            adc $1234,x         ; 7d 34 12
+            adc $1234,y         ; 79 34 12
+            adc $12             ; 65 12
+            adc #$12            ; 69 12
+            adc ($12,x)         ; 61 12
+            adc $12,x           ; 75 12
+            adc ($12),y         ; 71 12
+
+            and $12             ; 25 12
+            and #$12            ; 29 12
+            and $1234           ; 2d 34 12
+            and $1234,x         ; 3d 34 12
+            and $1234,y         ; 39 34 12
+            and ($12,x)         ; 21 12
+            and $12,x           ; 35 12
+            and ($12),y         ; 31 12
+
+            asl $12             ; 06 12
+            asl $1234           ; 0e 34 12
+            asl $1234,x         ; 1e 34 12
+            asl $12,x           ; 16 12
+            asl a               ; 0a
+
+            bcc *+$12           ; 90 12
+            bcs *+$12           ; b0 12
+            beq *+$12           ; f0 12
+
+            bit $12             ; 24 12
+            bit $1234           ; 2c 34 12
+
+            bmi *+$12           ; 30 12
+            bne *+$12           ; d0 12
+            bpl *+$12           ; 10 12
+
+            brk                 ; 00
+
+            bvc *+$12           ; 50 12
+            bvs *+$12           ; 70 12
+
+            clc                 ; 18
+            cld                 ; d8
+            cli                 ; 58
+            clv                 ; b8
+
+            cmp $1234           ; cd 34 12
+            cmp $1234,x         ; dd 34 12
+            cmp $1234,y         ; d9 34 12
+            cmp $12             ; c5 12
+            cmp #$12            ; c9 12
+            cmp ($12,x)         ; c1 12
+            cmp $12,x           ; d5 12
+            cmp ($12),y         ; d1 12
+
+            cpx $1234           ; ec 34 12
+            cpx #$12            ; e0 12
+            cpx $12             ; e4 12
+
+            cpy $1234           ; cc 34 12
+            cpy #$12            ; c0 12
+            cpy $12             ; c4 12
+
+            dec $1234           ; ce 34 12
+            dec $1234,x         ; de 34 12
+            dec $12             ; c6 12
+            dec $12,x           ; d6 12
+
+            dex                 ; ca
+            dey                 ; 88
+
+            eor $1234           ; 4d 34 12
+            eor $1234,x         ; 5d 34 12
+            eor $1234,y         ; 59 34 12
+            eor $12             ; 45 12
+            eor #$12            ; 49 12
+            eor ($12,x)         ; 41 12
+            eor $12,x           ; 55 12
+            eor ($12),y         ; 51 12
+
+            inc $1234           ; ee 34 12
+            inc $1234,x         ; fe 34 12
+            inc $12             ; e6 12
+            inc $12,x           ; f6 12
+
+            inx                 ; e8
+            iny                 ; c8
+
+            jmp $1234           ; 4c 34 12
+            jmp ($1234)         ; 6c 34 12
+
+            jsr $1234           ; 20 34 12
+
+            lda $1234           ; ad 34 12
+            lda $1234,x         ; bd 34 12
+            lda $1234,y         ; b9 34 12
+            lda $12             ; a5 12
+            lda #$12            ; a9 12
+            lda ($12,x)         ; a1 12
+            lda $12,x           ; b5 12
+            lda ($12),y         ; b1 12
+
+            ldx $1234           ; ae 34 12
+            ldx $1234,y         ; be 34 12
+            ldx #$12            ; a2 12
+            ldx $12             ; a6 12
+            ldx $12,y           ; b6 12
+
+            ldy $1234           ; ac 34 12
+            ldy $1234,x         ; bc 34 12
+            ldy #$12            ; a0 12
+            ldy $12             ; a4 12
+            ldy $12,x           ; b4 12
+
+            lsr $1234           ; 4e 34 12
+            lsr $1234,x         ; 5e 34 12
+            lsr $12             ; 46 12
+            lsr $12,x           ; 56 12
+            lsr a               ; 4a
+
+            nop                 ; ea
+
+            ora $12             ; 05 12
+            ora #$12            ; 09 12
+            ora $1234           ; 0d 34 12
+            ora $1234,x         ; 1d 34 12
+            ora $1234,y         ; 19 34 12
+            ora ($12,x)         ; 01 12
+            ora $12,x           ; 15 12
+            ora ($12),y         ; 11 12
+
+            pha                 ; 48
+            php                 ; 08
+            pla                 ; 68
+            plp                 ; 28
+
+            rol $12             ; 26 12
+            rol $1234           ; 2e 34 12
+            rol $1234,x         ; 3e 34 12
+            rol $12,x           ; 36 12
+            rol a               ; 2a
+            ror $1234           ; 6e 34 12
+            ror $1234,x         ; 7e 34 12
+            ror $12             ; 66 12
+            ror $12,x           ; 76 12
+            ror a               ; 6a
+
+            rti                 ; 40
+            rts                 ; 60
+
+            sbc $1234           ; ed 34 12
+            sbc $1234,x         ; fd 34 12
+            sbc $1234,y         ; f9 34 12
+            sbc $12             ; e5 12
+            sbc #$12            ; e9 12
+            sbc ($12,x)         ; e1 12
+            sbc $12,x           ; f5 12
+            sbc ($12),y         ; f1 12
+
+            sec                 ; 38
+            sed                 ; f8
+            sei                 ; 78
+
+            sta $1234           ; 8d 34 12
+            sta $1234,x         ; 9d 34 12
+            sta $1234,y         ; 99 34 12
+            sta $12             ; 85 12
+            sta ($12,x)         ; 81 12
+            sta $12,x           ; 95 12
+            sta ($12),y         ; 91 12
+
+            stx $1234           ; 8e 34 12
+            stx $12             ; 86 12
+            stx $12,y           ; 96 12
+
+            sty $1234           ; 8c 34 12
+            sty $12             ; 84 12
+            sty $12,x           ; 94 12
+
+            tax                 ; aa
+            tay                 ; a8
+            tsx                 ; ba
+            txa                 ; 8a
+            txs                 ; 9a
+            tya                 ; 98
-- 
2.39.5