base:removing_the_top_bottom_border
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base:removing_the_top_bottom_border [2015-04-17 04:33] (current) |
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| + | ====== Opening the Top/Bottom borders ====== | ||
| + | By HCL | ||
| + | |||
| + | Try this.. There may be typos, i didn't assemble it myself. | ||
| + | |||
| + | < | ||
| + | sei | ||
| + | |||
| + | ; First make sure the normal screen is shown. | ||
| + | |||
| + | bit $d011 | ||
| + | bpl *-3 | ||
| + | bit $d011 | ||
| + | bmi *-3 | ||
| + | lda #$1b | ||
| + | sta $d011 | ||
| + | |||
| + | ; For each frame, set screen-mode to 24 lines at y-position $f9 - $fa.. | ||
| + | loop: | ||
| + | lda #$f9 | ||
| + | cmp $d012 | ||
| + | bne *-3 | ||
| + | lda $d011 | ||
| + | and #$f7 | ||
| + | sta $d011 | ||
| + | |||
| + | ; .. and below y-position $fc, set it back to 25 lines. | ||
| + | bit $d011 | ||
| + | bpl *-3 | ||
| + | ora #8 | ||
| + | sta $d011 | ||
| + | jmp loop | ||
| + | </ | ||
base/removing_the_top_bottom_border.txt ยท Last modified: 2015-04-17 04:33 (external edit)