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goapple2/source/redbook/sweet16.asm
Zellyn Hunter a32cd8bd12 Adding sources.
2014-05-13 08:10:55 -07:00

242 lines
12 KiB
NASM
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1 ***********************
2 * *
3 * APPLE-II PSEUDO *
4 * MACHINE INTERPRETER *
5 * *
6 * COPYRIGHT 1977 *
7 * APPLE COMPUTER INC *
8 * *
9 * ALL RIGHTS RESERVED *
10 * S. WOZNIAK *
11 * *
12 ***********************
13 ; TITLE "SWEET16 INTERPRETER"
14 R0L EQU $0
15 R0H EQU $1
16 R14H EQU $1D
17 R15L EQU $1E
18 R15H EQU $1F
19 SW16PAG EQU $F7
20 SAVE EQU $FF4A
21 RESTORE EQU $FF3F
22 ORG $F689
F689: 20 4A FF 23 SW16 JSR SAVE ;PRESERVE 6502 REG CONTENTS
F68C: 68 24 PLA
F68D: 85 1E 25 STA R15L ;INIT SWEET16 PC
F68F: 68 26 PLA ;FROM RETURN
F690: 85 1F 27 STA R15H ; ADDRESS
F692: 20 98 F6 28 SW16B JSR SW16C ;INTERPRET AND EXECUTE
F695: 4C 92 F6 29 JMP SW16B ;ONE SWEET16 INSTR.
F698: E6 1E 30 SW16C INC R15L
F69A: D0 02 31 BNE SW16D ;INCR SWEET16 PC FOR FETCH
F69C: E6 1F 32 INC R15H
F69E: A9 F7 33 SW16D LDA #SW16PAG
F6A0: 48 34 PHA ;PUSH ON STACK FOR RTS
F6A1: A0 00 35 LDY #$0
F6A3: B1 1E 36 LDA (R15L),Y ;FETCH INSTR
F6A5: 29 0F 37 AND #$F ;MASK REG SPECIFICATION
F6A7: 0A 38 ASL ;DOUBLE FOR TWO BYTE REGISTERS
F6A8: AA 39 TAX ;TO X REG FOR INDEXING
F6A9: 4A 40 LSR
F6AA: 51 1E 41 EOR (R15L),Y ;NOW HAVE OPCODE
F6AC: F0 0B 42 BEQ TOBR ;IF ZERO THEN NON-REG OP
F6AE: 86 1D 43 STX R14H ;INDICATE'PRIOR RESULT REG'
F6B0: 4A 44 LSR
F6B1: 4A 45 LSR ;OPCODE*2 TO LSB'S
F6B2: 4A 46 LSR
F6B3: A8 47 TAY ;TO Y REG FOR INDEXING
F6B4: B9 E1 F6 48 LDA OPTBL-2,Y ;LOW ORDER ADR BYTE
F6B7: 48 49 PHA ;ONTO STACK
F6B8: 60 50 RTS ;GOTO REG-OP ROUTINE
F6B9: E6 1E 51 TOBR INC R15L
F6BB: D0 02 52 BNE TOBR2 ;INCR PC
F6BD: E6 1F 53 INC R15H
F6BF: BD E4 F6 54 TOBR2 LDA BRTBL,X ;LOW ORDER ADR BYTE
F6C2: 48 55 PHA ;ONTO STACK FOR NON-REG OP
F6C3: A5 1D 56 LDA R14H ;'PRIOR RESULT REG' INDEX
F6C5: 4A 57 LSR ;PREPARE CARRY FOR BC, BNC.
F6C6: 60 58 RTS ;GOTO NON-REG OP ROUTINE
F6C7: 68 59 RTNZ PLA ;POP RETURN ADDRESS
F6C8: 68 60 PLA
F6C9: 20 3F FF 61 JSR RESTORE ;RESTORE 6502 REG CONTENTS
F6CC: 6C 1E 00 62 JMP (R15L) ;RETURN TO 6502 CODE VIA PC
F6CF: B1 1E 63 SETZ LDA (R15L),Y ;HIGH-ORDER BYTE OF CONSTANT
F6D1: 95 01 64 STA R0H,X
F6D3: 88 65 DEY
F6D4: B1 1E 66 LDA (R15L),Y ;LOW-ORDER BYTE OF CONSTANT
F6D6: 95 00 67 STA R0L,X
F6D8: 98 68 TYA ;Y-REG CONTAINS 1
F6D9: 38 69 SEC
F6DA: 65 1E 70 ADC R15L ;ADD 2 TO PC
F6DC: 85 1E 71 STA R15L
F6DE: 90 02 72 BCC SET2
F6E0: E6 1F 73 INC R15H
F6E2: 60 74 SET2 RTS
F6E3: 02 75 OPTBL DFB SET-1 ;1X
F6E4: F9 76 BRTBL DFB RTN-1 ;0
F6E5: 04 77 DFB LD-1 ;2X
F6E6: 9D 78 DFB BR-1 ;1
F6E7: 0D 79 DFB ST-1 ;3X
F6E8: 9E 80 DFB BNC-1 ;2
F6E9: 25 81 DFB LDAT-1 ;4X
F6EA: AF 82 DFB BC-1 ;3
F6EB: 16 83 DFB STAT-1 ;5X
F6EC: B2 84 DFB BP-1 ;4
F6ED: 47 85 DFB LDDAT-1 ;6X
F6EE: B9 86 DFB BM-1 ;5
F6EF: 51 87 DFB STDAT-1 ;7X
F6F0: C0 88 DFB BZ-1 ;6
F6F1: 2F 89 DFB POP-1 ;8X
F6F2: C9 90 DFB BNZ-1 ;7
F6F3: 5B 91 DFB STPAT-1 ;9X
F6F4: D2 92 DFB BM1-1 ;8
F6F5: 85 93 DFB ADD-1 ;AX
F6F6: DD 94 DFB BNM1-1 ;9
F6F7: 6E 95 DFB SUB-1 ;BX
F6F8: 05 96 DFB BK-1 ;A
F6F9: 33 97 DFB POPD-1 ;CX
F6FA: E8 98 DFB RS-1 ;B
F6FB: 70 99 DFB CPR-1 ;DX
F6FC: 93 100 DFB BS-1 ;C
F6FD: 1E 101 DFB INR-1 ;EX
F6FE: E7 102 DFB NUL-1 ;D
F6FF: 65 103 DFB DCR-1 ;FX
F700: E7 104 DFB NUL-1 ;E
F701: E7 105 DFB NUL-1 ;UNUSED
F702: E7 106 DFB NUL-1 ;F
F703: 10 CA 107 SET BPL SETZ ;ALWAYS TAKEN
F705: B5 00 108 LD LDA R0L,X
109 BK EQU *-1
F707: 85 00 110 STA R0L
F709: B5 01 111 LDA R0H,X ;MOVE RX TO R0
F70B: 85 01 112 STA R0H
F70D: 60 113 RTS
F70E: A5 00 114 ST LDA R0L
F710: 95 00 115 STA R0L,X ;MOVE R0 TO RX
F712: A5 01 116 LDA R0H
F714: 95 01 117 STA R0H,X
F716: 60 118 RTS
F717: A5 00 119 STAT LDA R0L
F719: 81 00 120 STAT2 STA (R0L,X) ;STORE BYTE INDIRECT
F71B: A0 00 121 LDY #$0
F71D: 84 1D 122 STAT3 STY R14H ;INDICATE R0 IS RESULT NEG
F71F: F6 00 123 INR INC R0L,X
F721: D0 02 124 BNE INR2 ;INCR RX
F723: F6 01 125 INC R0H,X
F725: 60 126 INR2 RTS
F726: A1 00 127 LDAT LDA (R0L,X) ;LOAD INDIRECT (RX)
F728: 85 00 128 STA R0L ;TO R0
F72A: A0 00 129 LDY #$0
F72C: 84 01 130 STY R0H ;ZERO HIGH-ORDER R0 BYTE
F72E: F0 ED 131 BEQ STAT3 ;ALWAYS TAKEN
F730: A0 00 132 POP LDY #$0 ;HIGH ORDER BYTE = 0
F732: F0 06 133 BEQ POP2 ;ALWAYS TAKEN
F734: 20 66 F7 134 POPD JSR DCR ;DECR RX
F737: A1 00 135 LDA (R0L,X) ;POP HIGH ORDER BYTE @RX
F739: A8 136 TAY ;SAVE IN Y-REG
F73A: 20 66 F7 137 POP2 JSR DCR ;DECR RX
F73D: A1 00 138 LDA (R0L,X) ;LOW-ORDER BYTE
F73F: 85 00 139 STA R0L ;TO R0
F741: 84 01 140 STY R0H
F743: A0 00 141 POP3 LDY #$0 ;INDICATE R0 AS LAST RESULT REG
F745: 84 1D 142 STY R14H
F747: 60 143 RTS
F748: 20 26 F7 144 LDDAT JSR LDAT ;LOW-ORDER BYTE TO R0, INCR RX
F74B: A1 00 145 LDA (R0L,X) ;HIGH-ORDER BYTE TO R0
F74D: 85 01 146 STA R0H
F74F: 4C 1F F7 147 JMP INR ;INCR RX
F752: 20 17 F7 148 STDAT JSR STAT ;STORE INDIRECT LOW-ORDER
F755: A5 01 149 LDA R0H ;BYTE AND INCR RX. THEN
F757: 81 00 150 STA (R0L,X) ;STORE HIGH-ORDER BYTE.
F759: 4C 1F F7 151 JMP INR ;INCR RX AND RETURN
F75C: 20 66 F7 152 STPAT JSR DCR ;DECR RX
F75F: A5 00 153 LDA R0L
F761: 81 00 154 STA (R0L,X) ;STORE R0 LOW BYTE @RX
F763: 4C 43 F7 155 JMP POP3 ;INDICATE R0 AS LAST RSLT REG
F766: B5 00 156 DCR LDA R0L,X
F768: D0 02 157 BNE DCR2 ;DECR RX
F76A: D6 01 158 DEC R0H,X
F76C: D6 00 159 DCR2 DEC R0L,X
F76E: 60 160 RTS
F76F: A0 00 161 SUB LDY #$0 ;RESULT TO R0
F771: 38 162 CPR SEC ;NOTE Y-REG = 13*2 FOR CPR
F772: A5 00 163 LDA R0L
F774: F5 00 164 SBC R0L,X
F776: 99 00 00 165 STA R0L,Y ;R0-RX TO RY
F779: A5 01 166 LDA R0H
F77B: F5 01 167 SBC R0H,X
F77D: 99 01 00 168 SUB2 STA R0H,Y
F780: 98 169 TYA ;LAST RESULT REG*2
F781: 69 00 170 ADC #$0 ;CARRY TO LSB
F783: 85 1D 171 STA R14H
F785: 60 172 RTS
F786: A5 00 173 ADD LDA R0L
F788: 75 00 174 ADC R0L,X
F78A: 85 00 175 STA R0L ;R0+RX TO R0
F78C: A5 01 176 LDA R0H
F78E: 75 01 177 ADC R0H,X
F790: A0 00 178 LDY #$0 ;R0 FOR RESULT
F792: F0 E9 179 BEQ SUB2 ;FINISH ADD
F794: A5 1E 180 BS LDA R15L ;NOTE X-REG IS 12*2!
F796: 20 19 F7 181 JSR STAT2 ;PUSH LOW PC BYTE VIA R12
F799: A5 1F 182 LDA R15H
F79B: 20 19 F7 183 JSR STAT2 ;PUSH HIGH-ORDER PC BYTE
F79E: 18 184 BR CLC
F79F: B0 0E 185 BNC BCS BNC2 ;NO CARRY TEST
F7A1: B1 1E 186 BR1 LDA (R15L),Y ;DISPLACEMENT BYTE
F7A3: 10 01 187 BPL BR2
F7A5: 88 188 DEY
F7A6: 65 1E 189 BR2 ADC R15L ;ADD TO PC
F7A8: 85 1E 190 STA R15L
F7AA: 98 191 TYA
F7AB: 65 1F 192 ADC R15H
F7AD: 85 1F 193 STA R15H
F7AF: 60 194 BNC2 RTS
F7B0: B0 EC 195 BC BCS BR
F7B2: 60 196 RTS
F7B3: 0A 197 BP ASL ;DOUBLE RESULT-REG INDEX
F7B4: AA 198 TAX ;TO X REG FOR INDEXING
F7B5: B5 01 199 LDA R0H,X ;TEST FOR PLUS
F7B7: 10 E8 200 BPL BR1 ;BRANCH IF SO
F7B9: 60 201 RTS
F7BA: 0A 202 BM ASL ;DOUBLE RESULT-REG INDEX
F7BB: AA 203 TAX
F7BC: B5 01 204 LDA R0H,X ;TEST FOR MINUS
F7BE: 30 E1 205 BMI BR1
F7C0: 60 206 RTS
F7C1: 0A 207 BZ ASL ;DOUBLE RESULT-REG INDEX
F7C2: AA 208 TAX
F7C3: B5 00 209 LDA R0L,X ;TEST FOR ZERO
F7C5: 15 01 210 ORA R0H,X ;(BOTH BYTES)
F7C7: F0 D8 211 BEQ BR1 ;BRANCH IF SO
F7C9: 60 212 RTS
F7CA: 0A 213 BNZ ASL ;DOUBLE RESULT-REG INDEX
F7CB: AA 214 TAX
F7CC: B5 00 215 LDA R0L,X ;TEST FOR NON-ZERO
F7CE: 15 01 216 ORA R0H,X ;(BOTH BYTES)
F7D0: D0 CF 217 BNE BR1 ;BRANCH IF SO
F7D2: 60 218 RTS
F7D3: 0A 219 BM1 ASL ;DOUBLE RESULT-REG INDEX
F7D4: AA 220 TAX
F7D5: B5 00 221 LDA R0L,X ;CHECK BOTH BYTES
F7D7: 35 01 222 AND R0H,X ;FOR $FF (MINUS 1)
F7D9: 49 FF 223 EOR #$FF
F7DB: F0 C4 224 BEQ BR1 ;BRANCH IF SO
F7DD: 60 225 RTS
F7DE: 0A 226 BNM1 ASL ;DOUBLE RESULT-REG INDEX
F7DF: AA 227 TAX
F7E0: B5 00 228 LDA R0L,X
F7E2: 35 01 229 AND R0H,X ;CHECK BOTH BYTES FOR NO $FF
F7E4: 49 FF 230 EOR #$FF
F7E6: D0 B9 231 BNE BR1 ;BRANCH IF NOT MINUS 1
F7E8: 60 232 NUL RTS
F7E9: A2 18 233 RS LDX #$18 ;12*2 FOR R12 AS STACK POINTER
F7EB: 20 66 F7 234 JSR DCR ;DECR STACK POINTER
F7EE: A1 00 235 LDA (R0L,X) ;POP HIGH RETURN ADDRESS TO PC
F7F0: 85 1F 236 STA R15H
F7F2: 20 66 F7 237 JSR DCR ;SAME FOR LOW-ORDER BYTE
F7F5: A1 00 238 LDA (R0L,X)
F7F7: 85 1E 239 STA R15L
F7F9: 60 240 RTS
F7FA: 4C C7 F6 241 RTN JMP RTNZ
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