Browse Source
Merge pull request #58 from feilipu/master
hbios - z180 CMR/CCR config
pull/80/head
Wayne Warthen
6 years ago
committed by
GitHub
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with
10 additions and
6 deletions
-
Source/HBIOS/hbios.asm
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@ -776,8 +776,8 @@ HB_START: |
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; SET DEFAULT CPU CLOCK MULTIPLIERS (XTAL / 2) |
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XOR A |
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OUT0 (Z180_CCR),A |
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OUT0 (Z180_CMR),A |
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OUT0 (Z180_CCR),A |
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; SET DEFAULT WAIT STATES |
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LD A,$F0 |
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@ -1269,7 +1269,7 @@ HB_CPU1: |
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LD C,(CPUOSC / 2) / 1000000 |
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LD DE,(CPUOSC / 2) / 1000 |
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; |
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#IF (Z180_CLKDIV >= 1) |
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#IF (Z180_CLKDIV == 1) |
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LD A,(HB_CPUTYPE) ; GET CPU TYPE |
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CP 2 ; Z8S180 REV K OR BETTER? |
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JR C,HB_CPU2 ; IF NOT, NOT POSSIBLE! |
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@ -1279,19 +1279,23 @@ HB_CPU1: |
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; REFLECT SPEED CHANGE |
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LD C,CPUOSC / 1000000 |
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LD DE,CPUOSC / 1000 |
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#ENDIF |
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#IF (Z180_CLKDIV >= 2) |
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#ELSE |
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; |
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#IF (Z180_CLKDIV == 2) |
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LD A,(HB_CPUTYPE) ; GET CPU TYPE |
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CP 3 ; Z8S180 REV N OR BETTER? |
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JR C,HB_CPU2 ; IF NOT, NOT POSSIBLE! |
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; SET CPU MULTIPLIER TO 1 RESULTING IN XTAL * 2 SPEED |
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LD A,$80 |
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OUT0 (Z180_CMR),A |
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OUT0 (Z180_CMR),A ; MUST SET CMR BEFORE CCR |
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OUT0 (Z180_CCR),A |
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; REFLECT SPEED CHANGE |
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LD C,(CPUOSC * 2) / 1000000 |
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LD DE,(CPUOSC * 2) / 1000 |
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#ENDIF |
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; |
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#ENDIF |
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; |
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HB_CPU2: |
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; SAVE CPU SPEED IN CONFIG BLOCK |
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LD A,C |
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