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Fix: DE registers corrupted by extended BIOS handling code #88

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Aug 19, 2021
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Fix: DE registers corrupted by extended BIOS handling code #88

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6 changes: 6 additions & 0 deletions source/kernel/bank1/mapinit.mac
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Original file line number Diff line number Diff line change
Expand Up @@ -687,6 +687,12 @@ MAPBIO::
; For other values of D, the EXTBIO hook on the driver bank is called with D'=1.
; This must return D'=1 if old hook must be called, D'=0 otherwise.

push de ;DE must always be preserved
call MAPBDO
pop de
ret

MAPBDO:
exx
set 0,d
exx
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