64 lines
791 B
Plaintext
64 lines
791 B
Plaintext
.program vga_free_run
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entrypoint_vga_free_run:
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pull
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mov y, osr
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.wrap_target
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mov x, y
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wait irq 7
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loop:
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out pins, 1 [3]
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jmp x-- loop
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.wrap
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.program vga_hsync
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entrypoint_vga_hsync:
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pull
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mov isr, osr
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pull
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.wrap_target
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set pins, 0 [1]
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irq set 0
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mov x, isr
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hsync_pulse:
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jmp x-- hsync_pulse [3]
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set pins, 1 [1]
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set y, 24
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hsync_back_porch:
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jmp y-- hsync_back_porch [19]
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irq set 7
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mov x, osr [3]
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hsync_idle:
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jmp x-- hsync_idle [3]
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.wrap
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.program vga_vsync
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entrypoint_vga_vsync:
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pull
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mov isr, osr
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pull
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.wrap_target
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mov x, isr
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vsync_pulse:
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wait irq 0
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set pins, 0
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jmp x-- vsync_pulse
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mov x, osr
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vsync_idle:
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wait irq 0
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set pins, 1
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jmp x-- vsync_idle
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irq set 1
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.wrap
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