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SXB: replace uncredited borrowed code and save a byte, too

This commit is contained in:
mgcaret 2019-09-06 12:44:50 -07:00
parent 09018682cc
commit 2a2a826f40
1 changed files with 10 additions and 10 deletions
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20
platforms/W65C816SXB/platform-lib.s
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@ -300,17 +300,13 @@ romldr: PLATFORM_INCBIN "fcode/romloader.fc"
.a8
lda VIA2+VIA::PCR ; save existing PCR
pha
lda WR+3 ; get bank #
ror
php
ror
lda #$00
bcs :+
ora #%11000000
: plp
bcs :+
ora #%00001100
: sta VIA2+VIA::PCR
xba
lda WR+3
and #%00000011
tay
lda banktab,y
sta VIA2+VIA::PCR
ldy XR
lp: dey
bmi done
@ -322,4 +318,8 @@ done: pla
plp ; restore register size & interrupt state
.a16
rtl ; note long return
banktab: .byte %11001100
.byte %11000000
.byte %00001100
.byte %00000000
.endproc