75 lines
1.1 KiB
NASM
75 lines
1.1 KiB
NASM
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org 100h
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cpu 8086
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;0=00111111=3F
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;1=00000110=6
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;2=01011011=5B
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;3=01001111=4F
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;4=01100110=66
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;5=01101101=6D
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;6=01111101=7D
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;7=00000111=7
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;8=01111111=7F
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;9=01101111=6F
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;A=01110111=77
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;B=11111111=FF
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;C=00111001=39
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;D=10111111=BF
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;E=01111001=79
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;F=01110001=71
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INPUT equ 0h
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LED equ 0h
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SEGM equ 90h
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; 0 1 2 3 4 5 6 7 8 9 A B C D E F
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segtext db 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0xFF, 0x39, 0xBF, 0x79, 0x71
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jmp WDH
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WDH: in ax, INPUT
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mov bx, ax
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and ax, 00001111b;get second nibble
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;out LED, ax;debug, output to leds
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push ax;write result to stack
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mov ax, bx
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mov cl, 0x4
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shr ax, cl;shift right 4 times
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;out LED, ax;debug, output to leds
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pop bx;get from stack
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sub ax, bx
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out LED, ax;output to led
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;right seven segment display
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push ax
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mov bx, segtext
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and ax, 0000000000001111b
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add bx, ax
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mov al, [bx]
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out SEGM, al;output to seven segment display
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;left seven segment display
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pop ax;get from stack
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mov cl, 0x4
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shr ax, cl
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mov bx, segtext
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add bx, ax
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mov al, [bx]
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out SEGM + 0x2, al
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jmp WDH
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