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optimize keypress_minimal

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Peter Ferrie 2019-06-01 00:04:55 -04:00 committed by Vince Weaver
parent 6882bf713a
commit 49e1ce4fd7
1 changed files with 7 additions and 7 deletions
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14
pt3_player/keypress_minimal.s
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@ -7,40 +7,40 @@ get_key:
lda KEYPRESS ; 3
bpl no_key ; 2nt/3
bit KEYRESET ; clear the keyboard buffer ; 4
figure_out_key:
cmp #' '+128 ; the mask destroys space ; 2
beq save_key ; so handle it specially ; 2nt/3
and #$5f ; mask, to make upper-case ; 2
check_right_arrow:
cmp #$15 ; 2
cmp #$95 ; 2
bne check_left_arrow ; 2nt/3
lda #'D' ; 2
check_left_arrow:
cmp #$08 ; 2
cmp #$88 ; 2
bne check_up_arrow ; 2nt/3
lda #'A' ; 2
check_up_arrow:
cmp #$0B ; 2
cmp #$8B ; 2
bne check_down_arrow ; 2nt/3
lda #'W' ; 2
check_down_arrow:
cmp #$0A ; 2
cmp #$8A ; 2
bne check_escape ; 2nt/3
lda #'S' ; 2
check_escape:
and #$5f ; mask, to make upper-case ; 2
cmp #$1B ; 2
bne save_key ; 2nt/3
lda #'Q' ; 2
jmp save_key ; 3
bne save_key ; branch always ; 3
no_key:
lda #0 ; no key, so save a zero ; 2
save_key:
sta LASTKEY ; save the key to our buffer ; 2
bit KEYRESET ; clear the keyboard buffer ; 4
rts ; 6
;============