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acia: protect DE during aciaInt 

I don't know why I haven't noticed it wasn't protected. It must have
been behind many random problems I've been having...
This commit is contained in:
Virgil Dupras 2019-06-16 19:29:58 -04:00
parent 3bc165c8f6
commit 7c23e5a9ef
1 changed files with 13 additions and 11 deletions
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24
kernel/acia.asm
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@ -77,17 +77,19 @@ aciaInt:
cp l
jr z, .end ; Equal? buffer is full
; Alrighty, buffer not full. let's write.
ld de, ACIA_BUF
; A already contains our write index, add it to DE
call addDE
; increase our buf ptr while we still have it in A
call aciaIncIndex
ld (ACIA_BUFWRIDX), a
; And finally, fetch the value and write it.
in a, (ACIA_IO)
ld (de), a
push de ; <|
; Alrighty, buffer not full|. let's write.
ld de, ACIA_BUF ; |
; A already contains our wr|ite index, add it to DE
call addDE ; |
; increase our buf ptr whil|e we still have it in A
call aciaIncIndex ; |
ld (ACIA_BUFWRIDX), a ;
; |
; And finally, fetch the va|lue and write it.
in a, (ACIA_IO) ; |
ld (de), a ; |
pop de ; <|
.end:
pop hl