mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-04 10:51:10 +00:00
51 lines
1.2 KiB
Plaintext
51 lines
1.2 KiB
Plaintext
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GPBX
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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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PLA
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STA ADDR1 ; ZERO PAGE
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PLA
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STA ADDR1+1
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LDA ERRCTRL
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CMP #1
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BEQ :CHKERR
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JMP :ERREND
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:CHKERR
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LDA ADDR1+1
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CMP #$C0 ; MAX COL + 1
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BNE :BADHI
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LDA ADDR1
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CMP #$64
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BCS :BADLO
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LDA ADDR1
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CMP #$60
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BCC :BADLO
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JMP :ERREND
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:BADHI
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_ERR :E_SID;:E_BHI;:E_DMP1;RETURN;#10
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JMP :ERREND
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:BADLO
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_ERR :E_SID;:E_BLO;:E_DMP1;RETURN;#10
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:ERREND
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LDY #$00
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LDA (ADDR1),Y ; IF BTN = PUSHED
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BMI :1
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JMP :0
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:1
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LDY #$01 ; BTN PUSHED;A=1
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JMP :EXIT
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:0
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LDY #$00 ; BTN NOT PUSHED;A=0
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:EXIT
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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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TYA ; BTN FLAG MOVE TO A
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RTS
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:E_SID ASC "GPBX (PBX MACRO)",00
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:E_DMP1 ASC "DUMPING RETURN BLOCK...",00
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:E_BHI ASC "BAD HIGH BYTE--NOT A PADDLE BUTTON!.",00
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:E_BLO ASC "BAD LOW BYTE--NOT A PADDLE BUTTON",00
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