mirror of https://github.com/A2osX/A2osX.git
88 lines
2.6 KiB
Plaintext
88 lines
2.6 KiB
Plaintext
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NEW
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AUTO 3,1
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*--------------------------------------
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* PR#slot copy address from OUTVEC,slot to CSW
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* PR#Aaddr copy Aaddress into CSW
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* PR#slot,Aaddr copy Aaddress into OUTVEC,slot
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*
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* IN#slot copy address from INVEC,slot to KSW
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* IN#Aaddr copy Aaddress into KSW
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* IN#slot,Aaddr copy Aaddress into INVEC,slot
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*--------------------------------
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PR LDA #0
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.HS 2C SKIP NEXT LINE
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IN LDA #2
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PHA SAVE 0 OR 2
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ASL
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ASL 00 OR 08
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ORA VAL.LB +SLOT
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ASL *2
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TAX
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BIT FBITS WAS SLOT PARAMETER GIVEN?
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BVC .1 ...NO
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LDA FBITS+1 ...YES, WAS A$ PARM ALSO?
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BMI .2 ...YES, SO UPDATE TABLE
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TXA Check for "PR#0"
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BEQ .4 ...yes, so call MON.SETVID directly
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LDA OUTVEC,X ...NO, ONLY SLOT
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STA VAL.A SO GET VALUE FROM TABLE
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LDA OUTVEC+1,X
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STA VAL.A+1
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.1 JSR CHECK.IO.DRIVER
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BCS .3 ...NOT VALID DRIVER
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PLA POP SAVED 0 OR 2
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TAX
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LDA VAL.A INSTALL HOOK FOR DRIVER
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STA CSWL,X
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LDA VAL.A+1
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STA CSWH,X
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RTS
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*---ENTER NEW VALUE IN TABLE-----
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.2 JSR CHECK.IO.DRIVER
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BCS .3 ...ERROR
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PLA POP OFF SAVED 0 OR 2
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LDA VAL.A+1 UPDATE TABLE
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STA OUTVEC+1,X
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LDA VAL.A
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STA OUTVEC,X
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RTS
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.3 PLA POP OFF SAVED 0 OR 2
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LDA #$03 "NO DEVICE CONNECTED"
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RTS
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*--------------------------------
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.4 PLA POP OFF SAVED 0 OR 2
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JSR MON.SETVID
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CLC
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RTS
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*--------------------------------
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CHECK.IO.DRIVER
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LDA VAL.A GET DRIVER ADDRESS INTO PNTR
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STA DRIVER.PTR
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LDA VAL.A+1
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STA DRIVER.PTR+1
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LDY #0
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CMP #$C0 IS IT IN ROM AREA?
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BCC .3 ...NO
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LDA IO.OFF ...YES, TURN OFF $C800 SPACE
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STY RETRY.COUNT
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LDA (DRIVER.PTR),Y CHECK FOR ROM PRESENT
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CMP #$FF
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BEQ .4 ...NOT VALID ROM VALUE
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.1 CMP (DRIVER.PTR),Y BETTER NOT CHANGE...
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BNE .4 ...WOOPS, NOT ROM
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DEC RETRY.COUNT TRY IT 256 TIMES
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BNE .1 ...AGAIN
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.2 CLC ...REALLY A DRIVER
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RTS
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*---VERIFY RAM-BASED DRIVER------
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.3 LDA (DRIVER.PTR),Y GET FIRST BYTE
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CMP #$D8 "CLD" OPCODE?
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BEQ .2 ...YES, VALID DRIVER
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.4 SEC
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RTS
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*--------------------------------------
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MAN
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SAVE usr/src/scmasm.31/sci.s.prin
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LOAD usr/src/scmasm.31/scmasm.s
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ASM
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