mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-30 15:49:55 +00:00
129 lines
2.8 KiB
Plaintext
129 lines
2.8 KiB
Plaintext
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*``````````````````````````````*
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* HEX2BINASC :: *
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* *
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*- -*
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ????---- REG: AXYM *
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*- -*
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* CYCLES: ??? *
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* SIZE: *
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*- -*
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* USAGE: *
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* *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* .Y = COUNTER; TRASH *
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* .X = COUNTER; TRASH *
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* .A = LOW BYTE OF RET ADDR *
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* *
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* [RETURN] = STRING VALUE *
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* [RETLEN] = LENGTH OF STRING *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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HEX2BINASC
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*
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** SAVE RETURN ADDRESS
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*
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PLA
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STA RETADR
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PLA
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STA RETADR+1
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*
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** GET PARAMETERS
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*
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PLA
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STA :HBYTE
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*
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** MASK RIGHT
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*
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AND #$F0
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LSR
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LSR
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LSR
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LSR
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STA :LEFT
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LDA :HBYTE
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*
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** MASK LEFT
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*
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AND #$0F
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STA :RIGHT
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*
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** GET LEFT FROM LOOKUP TABLE
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*
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ASL :LEFT
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ASL :LEFT ; MUL BY 4
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LDX :LEFT
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LDA :BINTAB,X
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STA RETURN
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LDA :BINTAB,X+1
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STA RETURN+1
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LDA :BINTAB,X+2
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STA RETURN+2
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LDA :BINTAB,X+3
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STA RETURN+3
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*
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** NOW GET RIGHT
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*
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ASL :RIGHT
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ASL :RIGHT ; MUL BY 4
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LDX :RIGHT
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LDA :BINTAB,X
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STA RETURN+4
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LDA :BINTAB,X+1
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STA RETURN+5
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LDA :BINTAB,X+2
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STA RETURN+6
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LDA :BINTAB,X+3
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STA RETURN+7
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*
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LDA #8
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STA RETLEN
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*
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** RESTORE RETURN ADDRESS
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*
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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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*
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RTS ; RETURN
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*
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** DATA
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*
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:BINTAB ASC "0000" ; 0
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ASC "0001" ; 1
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ASC "0010" ; 2
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ASC "0011" ; 3
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ASC "0100" ; 4
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ASC "0101" ; 5
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ASC "0110" ; 6
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ASC "0111" ; 7
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ASC "1000" ; 8
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ASC "1001" ; 9
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ASC "1010" ; A
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ASC "1011" ; B
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ASC "1100" ; C
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ASC "1101" ; D
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ASC "1110" ; E
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ASC "1111" ; F
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*
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:LEFT DS 1
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:RIGHT DS 1
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:HBYTE DS 1
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