mirror of
https://github.com/A2osX/A2osX.git
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201 lines
4.0 KiB
Plaintext
201 lines
4.0 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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CPU.Init >LDAXI MSG.CPU
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jsr PrintCStrAX
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jsr Detect6502 A = CPU type
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sta A2osX.CPUTYPE
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lda MSG.CPUTYPEH,y
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tax
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lda MSG.CPUTYPEL,y
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jsr PrintCStrAX
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CPU.Init.Speed lda MACHID
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and #MACHID.TYPE
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cmp #MACHID.TYPE.IIc
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beq CPU.Init.Z80
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>LDAXI MSG.CPU.SPEED
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jsr PrintCStrAX
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stz A2osX.RANDOM16
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stz A2osX.RANDOM16+1
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php
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sei
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.1 bit VBL
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bpl .2
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.2 bit VBL
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bmi .2
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ldx #0 Count LO
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lda #0 Count HI
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.3 ldy #3 (2)
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.4 nop (2)
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dey (2)
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bne .4 (2*)
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inc A2osX.RANDOM16 (6)
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bne .5 (2*)
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inc A2osX.RANDOM16+1 (6)
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bit VBL (4)
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bpl .3 (2*)
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bmi .6
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.5 nop (2)
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nop (2)
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nop (2)
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bit VBL (4)
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bpl .3 (2*)
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.6 plp
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stz A2osX.CPUSPEED
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.7 sec
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lda A2osX.RANDOM16
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sbc #100
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tax
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lda A2osX.RANDOM16+1
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sbc /100
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bcc .8
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stx A2osX.RANDOM16
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sta A2osX.RANDOM16+1
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inc A2osX.CPUSPEED
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bra .7
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.8 lda A2osX.RANDOM16
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sta A2osX.CPUSPEED+1
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pha push CPU speed LO
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lda A2osX.CPUSPEED
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pha push CPU speed HI
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>LDAXI MSG.CPU.SPEEDOK
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jsr PrintCStrAX
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CPU.Init.Z80 >LDAXI MSG.Z80
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jsr PrintCStrAX
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jsr DetectZ80
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bcs .9
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sta A2osX.Z80SLOT
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pha Push Z80Slot
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>LDAXI MSG.Z80.OK
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jsr PrintCStrAX
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rts
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.9 >LDAXI MSG.Z80.KO
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jsr PrintCStrAX
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rts
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*--------------------------------------
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* Out:
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* A = $60, 6502
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* A = $61, 65C02
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* A = $62, R65C02
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* A = $63, 65C816
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*--------------------------------------
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Detect6502 ldy #0 Test 6502 BCD bug
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sed
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lda #$99
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clc
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adc #$01
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cld
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bmi .9 BUG!, we have 6502
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ldy #3 test 65C816 TYX Instruction
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ldx #0
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.OP 65816
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tyx TYX: if 65C816, x becomes non-zero
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.OP 65C02
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bne .9 worked! 65C816
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dey y=2 -> R65C02
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ldx $EA save zp $EA
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stz $EA store 0 in $EA
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* .OP 65R02
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.HS F7EA For compatibility with A2osX.ASM
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* smb 7,$EA if not Rockwell, assemble as nop nop
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* .OP 65C02
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asl $EA cs if Rockwell
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stx $EA restore zp $EA
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bcs .9
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dey y=1 -> 65C02
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.9 tya
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ora #$60
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rts
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*--------------------------------------
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* Out:
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* A = Z80 Slot
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*--------------------------------------
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DetectZ80 ldx #Z80Code.Size
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.1 lda Z80Code.Start-1,x
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sta $1000-1,x 00000H for Z80
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dex
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bne .1
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stz ZPQuickPtr1
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lda #$C1
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sta ZPQuickPtr1+1
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.2 sta (ZPQuickPtr1)
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lda $100D
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bmi .8
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inc ZPQuickPtr1+1
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lda ZPQuickPtr1+1
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cmp #$C8
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beq .9 CS
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clc
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adc #$20
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sta $100A
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bra .2
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.8 lda ZPQuickPtr1+1
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and #$0F
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clc
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.9 rts
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*--------------------------------------
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Z80Code.Start .HS 31FFFF START: LD SP,0FFFFH Init Stack
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.HS 3EFF LD A,0FFH Set Flag
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.HS 320D00 LD (FLAG),A
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.HS 3200E1 LD (0E100H),A Back to 6502
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.HS 18F3 JR START Loop
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.HS 00 FLAG: .DB 0
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Z80Code.End .EQ *
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Z80Code.Size .EQ Z80Code.End-Z80Code.Start
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*--------------------------------------
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MSG.CPU >CSTRING "Checking CPU..."
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MSG.CPU.SPEED >CSTRING "Detecting CPU Speed..."
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MSG.CPUTYPEL .DA #MSG.6502
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.DA #MSG.65C02
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.DA #MSG.65R02
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.DA #MSG.65816
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MSG.CPUTYPEH .DA /MSG.6502
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.DA /MSG.65C02
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.DA /MSG.65R02
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.DA /MSG.65816
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MSG.6502 >CSTRING "6502.\n"
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MSG.65C02 >CSTRING "65C02.\n"
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MSG.65R02 >CSTRING "65R02.\n"
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MSG.65816 >CSTRING "65816.\n"
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MSG.CPU.SPEEDOK >CSTRING "%d.%02d Mhz.\n"
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MSG.Z80 >CSTRING "Detecting Z80 CPU..."
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MSG.Z80.OK >CSTRING "Detected In Slot %d.\n"
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MSG.Z80.KO >CSTRING "Not Detected.\n"
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*--------------------------------------
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MAN
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SAVE SYS/KERNEL.S.CPU
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LOAD SYS/KERNEL.S
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ASM
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