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43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
; py65mon program initialization code for c02 programs
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;System Specific ASCII Key Mappings
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DELKEY EQU $08 ;Delete/Backspace Key (Delete)
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ESCKEY EQU $1B ;Escape/Stop Key (Escape)
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RTNKEY EQU $0D ;Return/Enter Key (Carriage Return)
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;Memory Mapped I/O
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PUTCON EQU $F001 ;Write Character to Console
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GETCON EQU $F004 ;Read Character from Console
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ORG $0200 ;Start Directly Above Stack
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START: JMP MAIN ;Execute Program
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;Delete Previous Character
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DELCHR: JSR DELCHB ;Print Backspace
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LDA #$20 ;Load Space into Accumulater
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JSR PRCHR ; and Print it
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DELCHB: LDA #$08 ;Load Backspace into Accumulator
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BNE PRCHR ; and Print it
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;Advance Character to Next line
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NEWLIN: LDA #$0D ;Load C/R into Accumulator
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JSR PRCHR ; and Print it
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LDA #$0A ;Load L/F into Accumulater
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; and fall into PRCHR
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;Print Character to Console
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PRCHR: STA PUTCON ;Write Character to Console
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RTS
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;Poll Keyboard for Keypress
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PLKEY: LDA GETCON ;Read Character from Console
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RTS
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;Wait for Character from Console
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RDKEY: JSR PLKEY ;Read Character from Console
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BEQ RDKEY ; Loop if None Received
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RTS
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EXIT: BRK ;Return to Monitor
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