mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-22 14:33:51 +00:00
59 lines
1.8 KiB
NASM
59 lines
1.8 KiB
NASM
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ORG 04000H
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; LOAD 04000H
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; MSX cartridge header @ 0x4000 - 0x400f
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dw 0x4241
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dw Start
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dw Start
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dw 0,0,0,0,0
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; ******************************
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; * BIOS STANDARD ROUTINES *
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; ******************************
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INITXT: EQU 006CH
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CHPUT: EQU 00A2H
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SNSMAT: EQU 0141H
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BREAKX: EQU 00B7H
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; ******************************
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; * WORKSPACE VARIABLES *
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; ******************************
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INTFLG: EQU 0FC9BH
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; ******************************
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; * CONTROL CHARACTERS *
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; ******************************
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LF: EQU 10
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HOME: EQU 11
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CR: EQU 13
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Start:
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MATRIX: CALL INITXT ; SCREEN 0
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MX1: LD A,HOME ;
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CALL CHPUT ; Home Cursor
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XOR A ; A=KBD row
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MX2: PUSH AF ;
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CALL SNSMAT ; Read a row
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LD B,8 ; Eight cols
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MX3: RLCA ; Select col
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PUSH AF ;
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AND 1 ;
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ADD A,"0" ; Result
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CALL CHPUT ; Display col
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POP AF ;
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DJNZ MX3 ;
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LD A,CR ; Newline
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CALL CHPUT ;
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LD A,LF ;
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CALL CHPUT ;
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POP AF ; A=KBD row
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INC A ; Next row
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CP 11 ; Finished?
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JR NZ,MX2 ;
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CALL BREAKX ; CTRL-STOP
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JR NC,MX1 ; Continue
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XOR A ;
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LD (INTFLG),A ; Clear possible STOP
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RET ; Back to BASIC
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