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Applecorn
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Disable interrupts around native 65816 code

This commit is contained in:
Bobbi Webber-Manners 2022-12-26 21:58:24 -05:00
parent 633b13175b
commit d2f2475212
2 changed files with 12 additions and 8 deletions
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applecorn.po
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20
auxmem.shr.s
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@ -268,27 +268,31 @@ SHRPRCHAR SEC
* 65816 code contributed by John Brooks follows ...
PHP ; Disauble interrupts
SEI
PHB ; Save data bank
LDA VDUADDR2+2 ; Push font Bank onto stack
PHA
PLB ; Set data bank to font bank
CLC
CLC ; 65816 native mode
XCE
REP #$30
REP #$30 ; 16 bit M & X
MX %00 ; Tell Merlin
LDY VDUADDR2 ; Font src ptr
LDX VDUADDR ; SHR dst ptr
SrcFont = $000000
DstShr = $E10000
LUP 8
LDA !SrcFont,Y
STAL DstShr,X
LUP 8 ; Unroll x 8
LDA !SrcFont,Y ; Read 2 bytes of exploded font
STAL DstShr,X ; Write 2 bytes to screen
SrcFont = SrcFont+2
DstShr = DstShr+160
--^
PLB
SEC
PLB ; Recover data bank
SEC ; Back to emulation mode
XCE
MX %11
MX %11 ; Tell Merlin
PLP ; Normal service resumed
RTS