114 lines
1011 B
NASM
114 lines
1011 B
NASM
INCLUDE dos_layer.asm
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org 0x100
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mov sp,#STACK
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MOV AX,#0x1
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MOV BX,#0x1
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CALL PRINT_HEX
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push bx
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MAIN_LOOP:
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pop bx
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CALL PRINT_HEX
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push AX
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ADD AX,BX
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JNC MAIN_LOOP
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pop bx
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MOV AH,#0x02
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MOV DL,#0x0a
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INT #0x21
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hlt
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;Input AX
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PRINT_HEX:
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PUSH DX
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TEST AH,#0xF0
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jz NOT_FIRST_NIBBLE
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MOV DL,AH
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CALL PRINT_HIGH
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JMP SKIP1
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NOT_FIRST_NIBBLE:
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TEST AH,#0x0F
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jz NOT_SECOND_NIBBLE
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SKIP1:
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MOV DL,AH
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CALL PRINT_LOW
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JMP SKIP2
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NOT_SECOND_NIBBLE:
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TEST AL,#0xF0
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jz NOT_THIRD_NIBBLE
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SKIP2:
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MOV DL,AL
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CALL PRINT_HIGH
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NOT_THIRD_NIBBLE:
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MOV DL,AL
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CALL PRINT_LOW
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PUSH AX
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MOV AH,#0x02
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MOV DL,#0x20
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INT #0x21
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POP AX
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POP DX
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RET
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PRINT_HIGH:
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AND DL,#0xF0
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TEST DL,#0x80
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jz NOT1
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OR DL,#0x08
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NOT1:
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TEST DL,#0x40
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jz NOT2
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OR DL,#0x04
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NOT2:
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TEST DL,#0x20
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jz NOT3
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OR DL,#0x02
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NOT3:
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TEST DL,#0x10
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jz DONE
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OR DL,#0x01
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DONE:
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PRINT_LOW:
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PUSH AX
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AND DL,#0x0F
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CMP DL,#0x0A
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JNS LETTERS
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ADD DL,#0x30
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MOV AH,#0x02
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INT #0x21
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POP AX
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RET
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LETTERS:
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ADD DL,#0x37
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MOV AH,#0x02
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INT #0x21
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POP AX
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RET
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.BLKB 200
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STACK:
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.ORG 0xFFF0
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MOV AX,#0x0100
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JMP AX
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