-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathforth.asm
8206 lines (7094 loc) · 119 KB
/
forth.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
;
; BBC FORTH ROM DISASSEMBLY
;
; -----------------------------------------------------------------------------
;
; MACROS
;
; -----------------------------------------------------------------------------
MACRO DEFENTRY flags%,name$
EQUB flags%+LEN(name$)
IF LEN(name$)>1
EQUB MID$(name$,1,LEN(name$)-1)
ENDIF
EQUB $80+ASC(RIGHT$(name$,1))
ENDMACRO
MACRO DEFWORD name$
DEFENTRY $80,name$
ENDMACRO
MACRO DEFIMM name$
DEFENTRY $C0,name$
ENDMACRO
; -----------------------------------------------------------------------------
;
; FORTH CONFIGURATION FLAGS
;
; -----------------------------------------------------------------------------
KEEP_IN_ROM =? FALSE
REMOVE_UNREACHABLES =? FALSE
; -----------------------------------------------------------------------------
;
; OPERATING SYSTEM CALLS
;
; -----------------------------------------------------------------------------
BRKV = $0202
OSARGS = $FFDA
OSBYTE = $FFF4
OSCLI = $FFF7
OSFIND = $FFCE
OSGBPB = $FFD1
OSNEWL = $FFE7
OSRDCH = $FFE0
OSWORD = $FFF1
OSWRCH = $FFEE
LineFeed = $0A
CarriageReturn = $0D
EscapeFlag = $FF
EscapeKey = 27
PrintStrPtr = $12
JmpIndirectOpcode = $6C
ClearEscapeCondition = $7E
EnterLanguageRom = $8E
FlushBufferClass = $0F
ReadDisplayAddr = $85
ReadHighOrderAddr = $82
ReadHimem = $84
ReadKeyWithTimeLimit = $81
ReadHighWaterMark = $83
SetKeyboardRepeatDelay = $0B
SetKeyboardRepeatPeriod = $0C
OpenFileInputOutput = $C0
ReadLine = $00
; -----------------------------------------------------------------------------
BOS = $10 ; BOTTOM OF DATA STACK
TOS = $58 ; TOP OF DATA STACK
N = $60 ; SCRATCH WORKSPACE
XSAVE = $68 ; TEMPORARY FOR X REGISTER
W = XSAVE+2 ; CODE FIELD POINTER
IP = W+2 ; INTERPRETIVE POINTER
UP = IP+2 ; USER AREA POINTER
WBSIZ = 1+255+2 ; WORD BUFFER SIZE
UAREA = $400 ; USER AREA
WORDBU = UAREA+64 ; WORD BUFFER
TIBB = WORDBU+WBSIZ ; TERMINAL INPUT BUFFER
PADD = TIBB+126 ; PAD
RAM = PADD+80 ; RAM RELOCATION ADDR ($610)
EM = $7C00 ; END OF MEMORY+1
BLKSIZ = 1024
HDBT = BLKSIZ+4
NOBUF = 2
BUFS = NOBUF*HDBT
BUF1 = EM-BUFS ; FIRST BLOCK BUFFER
; -----------------------------------------------------------------------------
;
; ROM HEADER
;
; -----------------------------------------------------------------------------
ORG $8000
.RomStart
JMP LanguageEntry
JMP ServiceEntry
EQUB %11100010
EQUB CopyrightStr-1-RomStart
EQUB 1
.TitleStr
EQUB "FORTH",0
.VersionStr
EQUB "1.03",0
.CopyrightStr
EQUB "(C) Acornsoft Ltd. 1983",0
EQUW RomStart
EQUW 0 ; UNUSED
.ColdWarmStartStr
EQUB LineFeed,CarriageReturn
EQUB "COLD or WARM start (C/W)? ",0
EQUB 0 ; UNUSED
.PrintStr
LDA #>RomStart
STA PrintStrPtr+1
LDY #0
.PrintChr
LDA (PrintStrPtr),Y
BEQ PrintStrDone
JSR OSWRCH
INY
BNE PrintChr
.PrintStrDone
RTS
; -----------------------------------------------------------------------------
;
; SERVICE ENTRY
;
; -----------------------------------------------------------------------------
.ServiceEntry
CMP #4
BNE KnownStarCommand
PHA
TYA
PHA
LDA ($F2),Y
CMP #'F'
BEQ GotF
CMP #'f'
BNE NotStarForth
.GotF
INY
LDA ($F2),Y
CMP #'O'
BEQ GotFo
CMP #'o'
BNE CheckAbbreviated
.GotFo
INY
LDA ($F2),Y
CMP #'R'
BEQ GotFor
CMP #'r'
BNE CheckAbbreviated
.GotFor
INY
LDA ($F2),Y
CMP #'T'
BEQ GotFort
CMP #'t'
BNE CheckAbbreviated
.GotFort
INY
LDA ($F2),Y
CMP #'H'
BEQ GotForth
CMP #'h'
BNE CheckAbbreviated
.GotForth
INY
LDA ($F2),Y
CMP #CarriageReturn
BNE CheckAbbreviated
LDA #EnterLanguageRom
JMP OSBYTE
.CheckAbbreviated
CMP #'.'
BEQ GotForth
.NotStarForth
PLA
TAY
PLA
RTS
.KnownStarCommand
CMP #9
BEQ StarHelp
RTS
.StarHelp
PHA
TYA
PHA
JSR OSNEWL
LDA #<TitleStr
STA PrintStrPtr
JSR PrintStr
LDA #' '
JSR OSWRCH
LDA #<VersionStr
STA PrintStrPtr
JSR PrintStr
JSR OSNEWL
PLA
TAY
PLA
RTS
; -----------------------------------------------------------------------------
;
; LANGUAGE ENTRY
;
; -----------------------------------------------------------------------------
.LanguageEntry
CMP #1
BEQ LanguageEntryProper
RTS
.LanguageEntryProper
CLI
LDA #<ColdWarmStartStr
STA PrintStrPtr
.AskWarmCold
JSR PrintStr
JSR OSRDCH
CMP #EscapeKey
BNE CheckWarmCold
PHA
LDA #ClearEscapeCondition
JSR OSBYTE
PLA
.CheckWarmCold
CMP #'W'
BEQ UserChoseWarm
CMP #'C'
BNE AskWarmCold
JMP JumpCold
.UserChoseWarm
JMP JumpWarm
EQUB $FF,$FF ; UNUSED
; -----------------------------------------------------------------------------
;
; FORTH ORIGIN
;
; -----------------------------------------------------------------------------
ORG RomStart+$100
.ORIGIN
NOP
NOP
.JumpCold
JMP COLD+2
.JumpWarm
JMP WARM+2
.PtrToSTART
EQUW START+2
.PtrToPABORT
EQUW BRACKETABORT+2
; -----------------------------------------------------------------------------
;
; BOOT-UP PARAMETERS
;
; -----------------------------------------------------------------------------
.BootUpParameters
EQUW TOPNFA ; $0C +ORIGIN: ?
EQUW $7F ; $0E +ORIGIN: backspace character
.InitialUP
EQUW UAREA ; $10 +ORIGIN: initial UP
EQUW TOS ; $12 +ORIGIN: initial S0
EQUW $01FF ; $14 +ORIGIN: initial R0
EQUW TIBB ; $16 +ORIGIN: initial TIB
EQUW 31 ; $18 +ORIGIN: initial WIDTH
EQUW 0 ; $1A +ORIGIN: initial WARNING
EQUW TOPDP ; $1C +ORIGIN: initial FENCE
EQUW TOPDP ; $1E +ORIGIN: initial DP
EQUW VL0-REL ; $20 +ORIGIN: initial VOC-LINK
EQUW 1 ; $22 +ORIGIN: initial LK
EQUB "RdeG-H" ; Author Richard de Grandis-Harrison
.PtrToBrkHandler
EQUW BrkHandler
.PtrToESCAPE
EQUW ESCAPE+2
.PtrToOSERROR
EQUW OSERR+2
; -----------------------------------------------------------------------------
;
; RESTART
;
; -----------------------------------------------------------------------------
.Restart
LDA InitialUP+1
STA UP+1
LDA InitialUP
STA UP
.ResetUserVariables
LDA BootUpParameters,Y
STA (UP),Y
DEY
BPL ResetUserVariables
LDA #JmpIndirectOpcode
STA W-1
CLD
JMP RPSTORE+2 ; RUN FORTH
; -----------------------------------------------------------------------------
;
; LIT ( ... n )
;
; > Within a colon-definition, LIT is automatically compiled before each
; > 16-bit literal number encountered in the input text. Later execution
; > of LIT causes the contents of the following two bytes to be pushed
; > onto the stack.
;
; -----------------------------------------------------------------------------
.LIT_NFA
DEFWORD "LIT"
EQUW 0 ; FIRST WORD IN DICTIONARY
.LIT
EQUW *+2
LDA (IP),Y ; LOAD LO BYTE OF LITERAL
PHA ; PUSH ONTO STACK
INC IP ; INCREMENT IP
BNE L815B
INC IP+1
.L815B LDA (IP),Y ; LOAD HI BYTE OF LITERAL
INC IP ; INCREMENT IP
BNE PUSH ; PUSH LITERAL ONTO DATA STACK
INC IP+1
.PUSH DEX ; MAKE ROOM ON DATA STACK FOR
DEX ; 16-BIT VALUE
.PUT STA 1,X ; STORE 16-BIT VALUE FROM A AND
PLA ; RETURN STACK ONTO DATA STACK
STA 0,X
.NEXT LDY #1 ; W := (IP)
.NEXTY1 LDA (IP),Y
STA W+1
DEY
LDA (IP),Y
STA W
CLC ; IP := IP + 2
LDA IP
ADC #2
STA IP
BCC CheckEscape
INC IP+1
.CheckEscape
BIT EscapeFlag
BMI EscapePressed
JMP W-1 ; JMP (W)
.EscapePressed
JMP EscapeHandler
.SETUP ASL A
STA $5F
.L818D LDA 0,X
STA N,Y
INX
INY
CPY $5F
BNE L818D
LDY #0
RTS
; -----------------------------------------------------------------------------
;
; EXECUTE ( addr ... )
;
; > Executes the definition whose code field (execution) address is on
; > the stack.
;
; -----------------------------------------------------------------------------
.EXECUTE_NFA
DEFWORD "EXECUTE"
EQUW LIT_NFA
.EXECUTE
EQUW *+2
LDA 0,X ; W := POP()
STA W
LDA 1,X
STA W+1
INX
INX
JMP W-1 ; JMP (W)
; -----------------------------------------------------------------------------
;
; @EXECUTE ( addr ... )
;
; > Executes the definition whose code field (execution) address is
; > contained in the two bytes at the address addr.
;
; -----------------------------------------------------------------------------
.FETCHEXECUTE_NFA
DEFWORD "@EXECUTE"
EQUW EXECUTE_NFA
.FETCHEXECUTE
EQUW *+2
LDA (0,X) ; LO(W) := (X)
STA W
INC 0,X ; (X) := (X) + 1
BNE L81CB
INC 1,X
.L81CB LDA (0,X) ; HI(W) := (X)
STA W+1
INX ; X := X + 2
INX
JMP W-1
; -----------------------------------------------------------------------------
;
; BRANCH
;
; > The run-time procedure to cause an unconditional branch. The
; > following in-line value is added to the interpretive pointer to cause
; > a forward or backward branch. It is compiled by ELSE , AGAIN and
; > REPEAT .
;
; -----------------------------------------------------------------------------
.BRANCH_NFA
DEFWORD "BRANCH"
EQUW FETCHEXECUTE_NFA
.BRANCH
EQUW DOBRANCH
.DOBRANCHX
LDX XSAVE
.DOBRANCH
CLC
LDA (IP),Y ; A := IP + (IP)
ADC IP
PHA
INY ; Y := 1
LDA (IP),Y
ADC IP+1
STA IP+1 ; IP := A
PLA
STA IP
JMP NEXTY1
; -----------------------------------------------------------------------------
;
; 0BRANCH ( f ... )
;
; > The run-time procedure to cause a conditional branch. If f is false
; > the following in-line number is added to the interpretive pointer to
; > cause a forward or backward branch. It is compiled by IF , UNTIL and
; > WHILE .
;
; -----------------------------------------------------------------------------
.ZEROBRANCH_NFA
DEFWORD "0BRANCH"
EQUW BRANCH_NFA
.ZEROBRANCH
EQUW *+2
INX
INX
LDA $FE,X
ORA $FF,X
BEQ DOBRANCH
.BUMP CLC
LDA IP
ADC #2
STA IP
BCC L8213
INC IP+1
.L8213 JMP NEXT
; -----------------------------------------------------------------------------
;
; (LOOP)
;
; > The run-time procedure compiled by LOOP . It increments the loop
; > index by one and tests for loop completion. See LOOP .
;
; -----------------------------------------------------------------------------
.BRACKETLOOP_NFA
DEFWORD "(LOOP)"
EQUW ZEROBRANCH_NFA
.BRACKETLOOP
EQUW *+2
STX XSAVE
TSX
INC $101,X
BNE L8233
TYA
SEC
ADC $102,X
BVS L8246
STA $102,X
.L8233 CLC
LDA $103,X
SBC $101,X
LDA $104,X
SBC $102,X
BVC L8244
EOR #$80
.L8244 BPL DOBRANCHX
.L8246 LDX XSAVE
PLA
PLA
PLA
PLA
JMP BUMP
; -----------------------------------------------------------------------------
;
; (+LOOP) ( n ... )
;
; > The run-time procedure compiled by +LOOP . It increments the loop
; > index by the signed quantity n and tests for loop completion. See
; > +LOOP .
;
; -----------------------------------------------------------------------------
.BRACKETPLUSLOOP_NFA
DEFWORD "(+LOOP)"
EQUW BRACKETLOOP_NFA
.BRACKETPLUSLOOP
EQUW *+2
LDA 1,X
PHA
PHA
LDA 0,X
INX
INX
STX XSAVE
TSX
INX
INX
CLC
ADC $101,X
STA $101,X
PLA
ADC $102,X
STA $102,X
PLA
BVS L8246
BPL L8233
SEC
LDA $101,X
SBC $103,X
LDA $102,X
SBC $104,X
BVS L8246
BVC L8244
; (ULOOP)
.BRACKETULOOP_NFA
DEFWORD "(ULOOP)"
EQUW BRACKETPLUSLOOP_NFA
.BRACKETULOOP
EQUW *+2
STX XSAVE
TSX
INC $101,X
BNE L82A3
INC $102,X
.L82A3 CLC
LDA $103,X
SBC $101,X
LDA $104,X
SBC $102,X
JMP L8244
; -----------------------------------------------------------------------------
;
; I ( ... n )
;
; > Used in a DO ... LOOP to place the current value of the loop index on
; > the stack. It must be used at the same level of nesting as the DO ...
; > LOOP i.e. it will not operate correctly if included in a colon-
; > definition word between DO and LOOP .
;
; -----------------------------------------------------------------------------
.IDO_NFA
DEFWORD "I"
EQUW BRACKETULOOP_NFA
.IDO
EQUW *+2
STX XSAVE
TSX
LDA $101,X
PHA
LDA $102,X
LDX XSAVE
JMP PUSH
; (DO)
.XDO_NFA
DEFWORD "(DO)"
EQUW IDO_NFA
.XDO
EQUW *+2
LDA 3,X
PHA
LDA 2,X
PHA
LDA 1,X
PHA
LDA 0,X
PHA
.POPTWO INX ; X := X + 2
INX
.POP INX ; X := X + 2
INX
JMP NEXT
; HIADDR
.HIADDR_NFA
DEFWORD "HIADDR"
EQUW XDO_NFA
.HIADDR
EQUW *+2
STX XSAVE
LDA #ReadHighOrderAddr
JSR OSBYTE
TXA
LDX XSAVE
PHA
TYA
JMP PUSH
; MODEADDR
.MODEADDR_NFA
DEFWORD "MODEADDR"
EQUW HIADDR_NFA
.MODEADDR
EQUW *+2
STX XSAVE
LDA 0,X
TAX
LDA #ReadDisplayAddr
JSR OSBYTE
TXA
LDX XSAVE
STY 1,X
STA 0,X
JMP NEXT
; DIGIT
.DIGIT_NFA
DEFWORD "DIGIT"
EQUW MODEADDR_NFA
.DIGIT
EQUW *+2
SEC
LDA 2,X
SBC #'0'
BMI L8348
CMP #10
BMI L833B
SEC
SBC #7
CMP #10
BMI L8348
.L833B CMP 0,X
BPL L8348
STA 2,X
LDA #1
PHA
TYA
JMP PUT
.L8348 TYA
PHA
INX
INX
JMP PUT
; (FIND)
.BRACKETFIND_NFA
DEFWORD "(FIND)"
EQUW DIGIT_NFA
.BRACKETFIND
EQUW *+2
LDA #2
JSR SETUP
STX XSAVE
.L8361 LDY #0
LDA (N),Y
EOR (N+2),Y
AND #$3F
BNE L8398
.L836B INY
LDA (N),Y
EOR (N+2),Y
ASL A
BNE L8396
BCC L836B
LDX XSAVE
DEX
DEX
DEX
DEX
CLC
TYA
ADC #3
ADC N
STA 2,X
LDY #0
TYA
ADC N+1
STA 3,X
STY 1,X
LDA (N),Y
STA 0,X
LDA #1
PHA
JMP PUSH
.L8396 BCS L839D
.L8398 INY
LDA (N),Y
BPL L8398
.L839D INY
LDA (N),Y
TAX
INY
LDA (N),Y
STA N+1
STX N
ORA N
BNE L8361
LDX XSAVE
LDA #0
PHA
JMP PUSH
; ENCLOSE
.ENCLOSE_NFA
DEFWORD "ENCLOSE"
EQUW BRACKETFIND_NFA
.ENCLOSE
EQUW *+2
LDA #2
JSR SETUP
TXA
SEC
SBC #8
TAX
DEY
STY N+1
DEC N+3
.L83CF INY
BNE L83D6
INC N+1
INC N+3
.L83D6 LDA (N+2),Y
CMP N
BEQ L83CF
STY 4,X
LDA N+1
STA 5,X
.L83E2 LDA (N+2),Y
BNE L8404
STY 2,X
STY 0,X
LDA N+1
STA 3,X
STA 1,X
TYA
CMP 4,X
BNE L8401
LDA N+1
CMP 5,X
BNE L8401
INC 2,X
BNE L8401
INC 3,X
.L8401 JMP NEXT
.L8404 INY
BNE L840B
.L8407 INC N+3
INC N+1
.L840B CMP N
BNE L83E2
STY 0,X
LDA N+1
STA 1,X
STA 3,X
TYA
BNE L841C
DEC 3,X
.L841C DEY
STY 2,X
JMP NEXT
; SP@
.L8422 DEFWORD "SP@"
EQUW ENCLOSE_NFA
.SPFETCH
EQUW *+2
TXA
.PUSH0A PHA
LDA #0
JMP PUSH
; RP@
.L8431 DEFWORD "RP@"
EQUW L8422
.RPFETCH
EQUW *+2
STX XSAVE
TSX
TXA
LDX XSAVE
PHA
LDA #1
JMP PUSH
; SP!
.L8445 DEFWORD "SP!"
EQUW L8431
.SPSTORE
EQUW *+2
LDY #6
LDA (UP),Y
TAX
JMP NEXT
; RP!
.L8455 DEFWORD "RP!"
EQUW L8445
.RPSTORE
EQUW *+2
STX XSAVE
LDY #8
LDA (UP),Y
TAX
TXS
.L8465 LDX XSAVE
JMP NEXT
; (EMIT)
.L846A DEFWORD "(EMIT)"
EQUW L8455
.BRACKETEMIT EQUW *+2
TYA
SEC
LDY #$1A
ADC (UP),Y
STA (UP),Y
INY
LDA #0
ADC (UP),Y
STA (UP),Y
LDA 0,X
AND #$7F
JSR OSWRCH
JMP POP
; >VDU
.L848E DEFWORD ">VDU"
EQUW L9FFB-REL
.TOVDU EQUW *+2
LDA 0,X
JSR OSWRCH
JMP POP
; CMOVE
.L849F DEFWORD "CMOVE"
EQUW L848E
.CMOVE EQUW *+2
SEC
TYA
SBC 0,X
TYA
SBC 1,X
BPL L84D0
LDA #3
JSR SETUP
.L84B7 CPY N
BNE L84C2
DEC N+1
BPL L84C2
JMP NEXT
.L84C2 LDA (N+4),Y
STA (N+2),Y
INY
BNE L84B7
INC N+5
INC N+3
JMP L84B7
.L84D0 INX
INX
JMP POPTWO
; U*
.L84D5 DEFWORD "U*"
EQUW L849F
.USTAR EQUW *+2
LDA 0,X
STA N
LDA 1,X
STA N+1
TYA
STA 0,X
CLC
LDY #$11
BNE L84F9
.L84EC BCC L84F9
PHA
CLC
LDA 0,X
ADC N
STA 0,X
PLA
ADC N+1
.L84F9 ROR A
ROR 0,X
ROR 3,X
ROR 2,X
DEY
BNE L84EC
STA 1,X
JMP NEXT
; U/