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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!