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hbios - use z180 instructions

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Phillip Stevens
2019-11-14 23:00:35 +11:00
parent 9e815edc29
commit 446d969779
1 changed files with 5 additions and 10 deletions
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15
Source/HBIOS/hbios.asm
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@@ -1247,16 +1247,11 @@ HB_CPU1:
; SETUP PERIODIC TIMER INTERRUPT ON TIMER 0
; LD HL,CPUOSC/TICKSPERSEC/20-1 ; 50HZ = 18432000 / 50 / 20
LD HL,(CPUKHZ) ; 50HZ = 18432000 / 20 / 50 / X, SO X = CPU KHZ
LD B,0 ; 16-BIT I/O ADDRESS
LD C,Z180_TMDR0L ; INITIALIZE TIMER 0 DATA REGISTER
OUT (C),L
INC C
OUT (C),H
DEC HL ; RELOAD OCCURS *AFTER* ZERO
LD C,Z180_RLDR0L ; INITIALIZE TIMER 0 RELOAD REGISTER
OUT (C),L
INC C
OUT (C),H
DEC HL ; RELOAD OCCURS *AFTER* ZERO
OUT0 (Z180_TMDR0L),L ; INITIALIZE TIMER 0 DATA REGISTER
OUT0 (Z180_TMDR0H),H
OUT0 (Z180_RLDR0L),L ; INITIALIZE TIMER 0 RELOAD REGISTER
OUT0 (Z180_RLDR0H),H
LD A,%00010001 ; ENABLE TIMER0 INT AND DOWN COUNTING
OUT0 (Z180_TCR),A
;