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magaload: qkumba let me know a better way of getting current DOS33 slot

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This commit is contained in:
Vince Weaver 2018-10-30 14:41:02 -04:00
parent 3a24f2a1b3
commit 1ce5dbe814
1 changed files with 15 additions and 5 deletions
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20
megademo/megaload.s
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@ -1,15 +1,14 @@
; read any file slot 6 version
; based on FASTLD6 and RTS copyright (c) Peter Ferrie 2011-2013,2018
; TODO:
; non-slot6? self modfiy code?
; Slot<<4 is in $2b by boot firmware? can we rely on that?
; modified to assembled with ca64 -- vmw
; added code to patch it to run from current disk slot -- vmw
adrlo = $26 ; constant from boot prom
adrhi = $27 ; constant from boot prom
tmpsec = $3c ; constant from boot prom
reqsec = $3d ; constant from boot prom
curtrk = $40
sizelo = $44
sizehi = $45
secsize = $46
@ -156,7 +155,18 @@ md000x2_filename: ;.byte "MUSIC.D000X2 "
init:
; patch to use current drive
lda $2b ; has boot slot << 4 ?
; locate input paramater list
jsr $3E3
; result is in A:Y
sta $FF
sty $FE
ldy #1
lda ($FE),y
; list+1 should have slot<<8
ora #$80 ; add in $80
; c0e0