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dya: copying... this is suspiciously easy

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Vince Weaver 2018-11-20 12:24:11 -05:00
parent c1ce7d59a8
commit b3ab064899
1 changed files with 28 additions and 0 deletions
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28
dya/chiptune_player.s
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@ -557,6 +557,34 @@ page_copy_loop:
sta $1000,X ; 5
inx ; 2
bne page_copy_loop ; 2nt/3
;========================
; page copy2
;========================
; want to copy:
; SRC: chunk_buffer+(2*256)+(COPY_OFFSET*3*256)
; DST: chunk_buffer+$2A00+(COPY_OFFSET*256)
page_copy2:
clc ; 2
lda #>(UNPACK_BUFFER2+512) ; 3
adc COPY_OFFSET ; 3
adc COPY_OFFSET ; 3
adc COPY_OFFSET ; 3
sta page_copy_loop2+2 ; self modify ; 5
lda #>(UNPACK_BUFFER2+$2A00) ; 2
adc COPY_OFFSET ; 3
sta page_copy_loop2+5 ; self modify ; 5
ldx #$00 ; 2
page_copy_loop2:
lda $1000,x ; 4
sta $1000,X ; 5
inx ; 2
bne page_copy_loop2 ; 2nt/3
rts ; 6
;======================
; 2+14*256+6+29= 3621