Apple-2-SW/dos33fsprogs
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optimize version detection

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Peter Ferrie 2019-06-01 00:19:44 -04:00 committed by Vince Weaver
parent 0ee00c4c54
commit dca5cb2e95
1 changed files with 6 additions and 11 deletions
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17
pt3_player/pt3_lib.s
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@ -431,7 +431,6 @@ pt3_init_song:
sta pt3_envelope_type ; 4
; default ornament/sample in A
lda #0 ; 2
ldx #(NOTE_STRUCT_SIZE*0) ; 2
jsr load_ornament ; 6+93
lda #1 ; 2
@ -468,26 +467,23 @@ pt3_init_song:
;======================
; calculate version
lda #6 ; 2
sta pt3_version ; 3
ldx #6 ; 2
lda PT3_LOC+PT3_VERSION ; 4
cmp #'0' ; 2
bcc not_ascii_number ; blt ; 2/3
cmp #'9' ; 2
bcs not_ascii_number ; bge ; 2/3
sec ; 2
sbc #'0' ; 2
sta pt3_version ; 4
cmp #9 ; 2
bcs not_ascii_number ; bge ; 2/3
tax ; 2
not_ascii_number:
stx pt3_version ; 3
;=======================
; Pick which volume number, based on version
; if (PlParams.PT3.PT3_Version <= 4)
lda pt3_version ; 4
cmp #5 ; 2
cpx #5 ; 2
; carry clear = 3.3/3.4 table
; carry set = 3.5 table
@ -514,7 +510,6 @@ calculate_note:
lda note_a+NOTE_ENABLED,X ; 4+
bne note_enabled ; 2/3
lda #0 ; 2
sta note_a+NOTE_AMPLITUDE,X ; 5
jmp done_note ; 3