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101 lines
2.1 KiB
101 lines
2.1 KiB
;___KIO________________________________________________________________________________________________________________
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;
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; Z80 KIO
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;
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; DISPLAY CONFIGURATION DETAILS
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;______________________________________________________________________________________________________________________
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;
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;
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;
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KIO_PIOADAT .EQU KIOBASE + $00
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KIO_PIOACMD .EQU KIOBASE + $01
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KIO_PIOBDAT .EQU KIOBASE + $02
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KIO_PIOBCMD .EQU KIOBASE + $03
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KIO_CTC0 .EQU KIOBASE + $04
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KIO_CTC1 .EQU KIOBASE + $05
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KIO_CTC2 .EQU KIOBASE + $06
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KIO_CTC3 .EQU KIOBASE + $07
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KIO_SIOADAT .EQU KIOBASE + $08
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KIO_SIOACMD .EQU KIOBASE + $09
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KIO_SIOBDAT .EQU KIOBASE + $0A
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KIO_SIOBCMD .EQU KIOBASE + $0B
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KIO_PIACDAT .EQU KIOBASE + $0C
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KIO_PIACCMD .EQU KIOBASE + $0D
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KIO_KIOCMD .EQU KIOBASE + $0E
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KIO_KIOCMDB .EQU KIOBASE + $0F
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;
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;
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;
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DEVECHO "KIO: IO="
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DEVECHO KIOBASE
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DEVECHO "\n"
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;
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KIO_PREINIT:
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CALL KIO_DETECT
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RET NZ
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;
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; RECORD PRESENCE
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LD A,$FF
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LD (KIO_EXISTS),A
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;HCS initialize KIO if NOT EZ512
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;HCS do not write to KIO command register, if EZ512
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;HCS because it is already done in monitor and will upset the bank register
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#IF (SDMODE != SDMODE_EZ512) ; Z80 PIO ON EAZY80-512
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; INITIALIZE KIO
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LD A,%11111001 ; RESET ALL DEVICES, SET DAISYCHAIN
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OUT (KIO_KIOCMD),A ; DO IT
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#ENDIF
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;
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XOR A
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RET
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;
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;
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;
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KIO_INIT:
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; ANNOUNCE PORT
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CALL NEWLINE ; FORMATTING
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PRTS("KIO:$") ; FORMATTING
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;
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PRTS(" IO=0x$") ; FORMATTING
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LD A,KIOBASE ; GET BASE PORT
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CALL PRTHEXBYTE ; PRINT BASE PORT
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;
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LD A,(KIO_EXISTS)
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OR A
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JR Z,KIO_INIT2
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;
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PRTS(" ENABLED$") ; DISPLAY ENABLED
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XOR A ; SIGNAL SUCCESS
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RET ; DONE
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;
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KIO_INIT2:
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PRTS(" NOT PRESENT$") ; NOT ZERO, H/W NOT PRESENT
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OR $FF ; SIGNAL FAILURE
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RET ; BAIL OUT
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;
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;
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;
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KIO_DETECT:
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LD C,KIO_SIOBCMD ; USE SIOB COMMAND PORT
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LD B,2 ; SIO REG 2
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;
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OUT (C),B
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XOR A ; ZERO
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OUT (C),A ; WRITE IT
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OUT (C),B
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IN A,(C)
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AND $F0 ; TOP NIBBLE ONLY
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RET NZ ; FAIL IF NOT ZERO
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;
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OUT (C),B
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LD A,$FF ; $FF
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OUT (C),A ; WRITE IT
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OUT (C),B
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IN A,(C)
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AND $F0 ; TOP NIBBLE ONLY
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CP $F0 ; COMPARE
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RET ; DONE, Z IF FOUND, NZ IF MISCOMPARE
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;
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;
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;
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KIO_EXISTS .DB 0
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