b1ackmai1er
6 years ago
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GitHub
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1 changed files with
4 additions and
9 deletions
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Source/HBIOS/hbios.asm
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@ -1247,16 +1247,11 @@ HB_CPU1: |
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; SETUP PERIODIC TIMER INTERRUPT ON TIMER 0 |
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; LD HL,CPUOSC/TICKSPERSEC/20-1 ; 50HZ = 18432000 / 50 / 20 |
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LD HL,(CPUKHZ) ; 50HZ = 18432000 / 20 / 50 / X, SO X = CPU KHZ |
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LD B,0 ; 16-BIT I/O ADDRESS |
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LD C,Z180_TMDR0L ; INITIALIZE TIMER 0 DATA REGISTER |
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OUT (C),L |
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INC C |
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OUT (C),H |
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DEC HL ; RELOAD OCCURS *AFTER* ZERO |
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LD C,Z180_RLDR0L ; INITIALIZE TIMER 0 RELOAD REGISTER |
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OUT (C),L |
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INC C |
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OUT (C),H |
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OUT0 (Z180_TMDR0L),L ; INITIALIZE TIMER 0 DATA REGISTER |
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OUT0 (Z180_TMDR0H),H |
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OUT0 (Z180_RLDR0L),L ; INITIALIZE TIMER 0 RELOAD REGISTER |
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OUT0 (Z180_RLDR0H),H |
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LD A,%00010001 ; ENABLE TIMER0 INT AND DOWN COUNTING |
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OUT0 (Z180_TCR),A |
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; |
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