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megaload: fix issue where wrong sectors were getting loaded

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seemed to be a subtle timing issue that was easy to hit on
AppleWin
This commit is contained in:
Vince Weaver 2018-10-13 16:55:29 -04:00
parent 1f6860c0a8
commit 26ed9b8d24
1 changed files with 5 additions and 5 deletions
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10
megademo/megaload.s
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@ -219,11 +219,11 @@ readfirst:
; read a file sector
readnext:
lda dirbuf, y
ldx dirbuf+1, y
sty TEMPY ; ** was phy **
lda dirbuf, y ; A = track
ldx dirbuf+1, y ; x = sector
sty TEMPY ; save t/s ptr ** was phy **
jsr seekread1
ldy TEMPY ; ** was ply **
ldy TEMPY ; restore t/s ptr ** was ply **
; if low count is non-zero then we are done
; (can happen only for partial last block)
@ -305,7 +305,7 @@ seekread1:
lda curtrk
cmp phase
beq repeat_until_right_sector
beq re_read_addr ; **was** repeat_until_right_sector
jsr seek
; [re-]read sector