35 lines
1.0 KiB
NASM
35 lines
1.0 KiB
NASM
; Initialize text mode
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main:
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ldw a, 0 ; Mode: 1 for text mode
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ldw b, 800 ; Horizontal resolution
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ldw c, 600 ; Vertical resolution
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int 0x70 ; Initialize display
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jsr test
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ldw b, 0 ; Cursor position (character cell index)
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ldw c, 0xFFFFFF ; White color
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main_loop:
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; Get key down (handle key press/release)
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mov f, b ; f <- b
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int 0xF6 ; a <- keycode | b <- first press
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add b, f, ; b = f + b ; This moves the value in f back to B, and sence b is eyther 1 or 0, it will eyther increment it, or not increment it.
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str b, 0xEE
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str a, 0xEF
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; If a key is not pressed (register 0x1 == 0), continue the loop
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ldw d, 0 ; Check if a key is pressed (if register 0x1 == 1)
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beq a, d, main_loop ; If A == 0, loop back to main_loop (no key is pressed)
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; Render the character
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int 0x72 ; Render the character (using the keycode from register 0x0 at position b)
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jmp main_loop ; Jump back to the main loop
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%include "std.asm" |