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https://github.com/cc65/cc65.git
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2c975d3642
Up to now static drivers were created via co65 from dynamic drivers. However there was an issue with that approach: The dynamic drivers are "o65 simple files" which obligates that they start with the 'code' segment. However dynamic drivers need to start with the module header - which is written to. For dynamic drivers this isn't more than a conceptual issue because they are always contain a 'data' segment and may therefore only be loaded into writable memory. However when dynamic drivers are converted to static drivers using co65 then that issue becomes a real problem as then the 'code' segment may end up in non-writable memory - and thus writing to the module header fails. Instead of changing the way dynamic drivers work I opted to rather make static driver creation totally independent from dynamic drivers. This allows to place the module header in the 'data' segment (see 'module.mac').
586 lines
14 KiB
ArmAsm
586 lines
14 KiB
ArmAsm
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; Christian Groessler, Dec-2001
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; converted to driver interface Dec-2013
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;
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; RS232 routines using the R: device (currently tested with an 850 only)
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;
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.include "zeropage.inc"
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.include "ser-kernel.inc"
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.include "ser-error.inc"
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.include "atari.inc"
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.ifdef __ATARIXL__
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module_header _atrxrdev_ser
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.else
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module_header _atrrdev_ser
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.endif
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; Driver signature
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.byte $73, $65, $72 ; "ser"
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.byte SER_API_VERSION ; Serial API version number
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; Library reference
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libref: .addr $0000
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; Jump table
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.word SER_INSTALL
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.word SER_UNINSTALL
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.word SER_OPEN
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.word SER_CLOSE
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.word SER_GET
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.word SER_PUT
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.word SER_STATUS
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.word SER_IOCTL
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.word SER_IRQ
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.rodata
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rdev: .byte "R:", ATEOL, 0
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bauds: .byte 1 ; SER_BAUD_45_5
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.byte 2 ; SER_BAUD_50
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.byte 4 ; SER_BAUD_75
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.byte 5 ; SER_BAUD_110
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.byte 6 ; SER_BAUD_134_5
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.byte 7 ; SER_BAUD_150
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.byte 8 ; SER_BAUD_300
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.byte 9 ; SER_BAUD_600
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.byte 10 ; SER_BAUD_1200
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.byte 11 ; SER_BAUD_1800
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.byte 12 ; SER_BAUD_2400
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.byte 0 ; SER_BAUD_3600
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.byte 13 ; SER_BAUD_4800
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.byte 0 ; SER_BAUD_7200
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.byte 14 ; SER_BAUD_9600
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.byte 0 ; SER_BAUD_19200
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.byte 0 ; SER_BAUD_38400
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.byte 0 ; SER_BAUD_57600
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.byte 0 ; SER_BAUD_115200
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.byte 0 ; SER_BAUD_230400
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.byte 0 ; SER_BAUD_31250
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.byte 0 ; SER_BAUD_62500
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.byte 3 ; SER_BAUD_56_875
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num_bauds = * - bauds
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databits:
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.byte 48 ; SER_BITS_5
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.byte 32 ; SER_BITS_6
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.byte 16 ; SER_BITS_7
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.byte 0 ; SER_BITS_8
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num_databits = * - databits
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parities:
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.byte 0 ; SER_PAR_NONE
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.byte 4+1 ; SER_PAR_ODD
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.byte 2+8 ; SER_PAR_EVEN
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;.byte 0 ; SER_PAR_MARK
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;.byte 0 ; SER_PAR_SPACE
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num_parities = * - parities
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.bss
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; receive buffer
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RECVBUF_SZ = 256
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recv_buf: .res RECVBUF_SZ
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cm_run: .res 1 ; concurrent mode running?
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.data
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rshand: .word $ffff
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; jump table into main program, initialized from libref
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my_newfd:
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.byte $4C
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.word 0
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my__close:
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.byte $4C
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.word 0
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my_pushax:
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.byte $4C
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.word 0
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my_popax:
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.byte $4C
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.word 0
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my_findfreeiocb:
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.byte $4C
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.word 0
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my___do_oserror:
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.byte $4C
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.word 0
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my_fddecusage:
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.byte $4C
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.word 0
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my_fdtoiocb:
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.byte $4C
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.word 0
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my___inviocb:
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.byte $4C
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.word 0
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my_clriocb:
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.byte $4C
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.word 0
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my_CIOV:
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.byte $4C
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.word 0
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.code
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invbaud:
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lda #<SER_ERR_BAUD_UNAVAIL
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ldx #>SER_ERR_BAUD_UNAVAIL
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openerr:
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rts
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;----------------------------------------------------------------------------
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; SER_OPEN: A pointer to a ser_params structure is passed in ptr1.
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; Must return an SER_ERR_xx code in a/x.
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SER_OPEN:
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jsr do_open
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bne openerr
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; set line parameters
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lda rshand
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ldx #0
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jsr my_fdtoiocb ; get iocb index into X
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bmi openerr ; shouldn't happen
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tax
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; set baud rate, word size, stop bits and ready monitoring
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; build ICAX1 value
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ldy #SER_PARAMS::BAUDRATE
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lda (ptr1),y
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cmp #num_bauds
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bcs invbaud
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tay
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lda bauds,y
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beq invbaud
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sta ICAX1,x
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ldy #SER_PARAMS::DATABITS
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lda (ptr1),y
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cmp #num_databits
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bcs init_err
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tay
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lda databits,y
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ora ICAX1,x
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sta ICAX1,x
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ldy #SER_PARAMS::STOPBITS
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lda (ptr1),y
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clc
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ror a
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ror a
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ora ICAX1,x
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sta ICAX1,x
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lda #36 ; xio 36, baud rate
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sta ICCOM,x
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lda #0
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;ICAX2 = 0, monitor nothing
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sta ICAX2,x
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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jsr my_CIOV
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bmi cioerr
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; check if the handshake setting is valid
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ldy #SER_PARAMS::HANDSHAKE
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lda (ptr1),y
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cmp #SER_HS_HW ; this is all we support
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bne init_err
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; set handshake lines
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lda #34 ; xio 34, set cts, dtr etc
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sta ICCOM,x
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lda #192+48+3 ; DTR on, RTS on, XMT on
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sta ICAX1,x
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jsr my_CIOV
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bmi cioerr
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; set translation and parity
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ldy #SER_PARAMS::PARITY
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lda (ptr1),y
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cmp #num_parities
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bcs init_err
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tay
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lda parities,y
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ora #32 ; no translation
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sta ICAX1,x
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lda #38 ; xio 38, translation and parity
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sta ICCOM,x
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jsr my_CIOV
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bmi cioerr
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lda #<SER_ERR_OK
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tax ; A is zero
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rts
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inverr: jmp my___inviocb
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cioerr:
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; @@@ need to close IOCB here
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jsr my_fddecusage ; decrement usage counter of fd as open failed
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init_err:
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ldx #0
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lda #SER_ERR_INIT_FAILED
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rts
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;---- open the device
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do_open:
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jsr my_findfreeiocb
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bne init_err
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txa
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tay ; move iocb # into Y
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lda #3
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sta tmp3 ; name length + 1
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lda #<rdev
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ldx #>rdev
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jsr my_newfd
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tya
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bcs @doopen ; C set: open needed / device not already open
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pha
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jsr SER_CLOSE ;** shut down if started @@@TODO check this out!!
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pla
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@doopen:tax
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pha
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jsr my_clriocb
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pla
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tax
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lda #<rdev
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sta ICBAL,x
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lda #>rdev
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sta ICBAH,x
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lda #OPEN
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sta ICCOM,x
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lda #$0D ; mode in+out+concurrent
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sta ICAX1,x
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lda #0
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sta ICAX2,x
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sta ICBLL,x ; zap buf len
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sta ICBLH,x
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jsr my_CIOV
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bmi cioerr
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lda tmp2 ; get fd (from newfd)
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sta rshand
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ldx #0
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stx rshand+1
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txa
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rts
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;----------------------------------------------------------------------------
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; CLOSE: Close the port, disable interrupts and flush the buffer. Called
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; without parameters. Must return an error code in a/x.
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;
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;----------------------------------------------------------------------------
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; SER_UNINSTALL routine. Is called before the driver is removed from memory.
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; Must return an SER_ERR_xx code in a/x.
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;
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SER_UNINSTALL:
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SER_CLOSE:
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lda rshand
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cmp #$ff
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beq @done
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ldx rshand+1
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jsr my__close
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ldx #$ff
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stx rshand
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stx rshand+1
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inx
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stx cm_run
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@done: lda #<SER_ERR_OK
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ldx #>SER_ERR_OK
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rts
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;----------------------------------------------------------------------------
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; SER_GET: Will fetch a character from the receive buffer and store it into the
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; variable pointer to by ptr1. If no data is available, SER_ERR_NO_DATA is
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; return.
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;
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SER_GET:
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ldy rshand
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cpy #$ff
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beq ni_err ; work only if initialized
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lda rshand
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ldx #0
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jsr my_fdtoiocb
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tax
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lda cm_run ; concurrent mode already running?
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bne @go
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jsr ena_cm ; turn on concurrent mode
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@go: ; check whether there is any input available
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lda #STATIS ; status request, returns bytes pending
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sta ICCOM,x
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jsr my_CIOV
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bmi ser_error
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lda DVSTAT+1 ; get byte count pending
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ora DVSTAT+2
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beq @nix_da ; no input waiting...
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; input is available: get it!
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lda #GETCHR ; get raw bytes
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sta ICCOM,x ; in command code
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lda #0
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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jsr my_CIOV ; go get it
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bmi ser_error
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ldx #0
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sta (ptr1,x) ; return received byte
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txa
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rts
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@nix_da:lda #SER_ERR_NO_DATA
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ldx #0
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rts
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ser_error:
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lda #SER_ERR_OVERFLOW ; there is no large selection of serial error codes... :-/
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ldx #0
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rts
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ni_err: lda #SER_ERR_NOT_OPEN
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ldx #0
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rts
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;----------------------------------------------------------------------------
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; SER_PUT: Output character in A.
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; Must return an error code in a/x.
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;
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SER_PUT:
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ldy rshand
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cpy #$ff
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beq ni_err ; work only if initialized
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pha ; remember char to write
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lda rshand
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ldx #0
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jsr my_fdtoiocb
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tax
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lda cm_run ; concurrent mode already running?
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bne @go
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jsr ena_cm ; turn on concurrent mode
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; @@@TODO: check output buffer overflow
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@go: lda #PUTCHR ; put raw bytes
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sta ICCOM,x ; in command code
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lda #0
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sta ICBLL,x
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sta ICBLH,x
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sta ICBAL,x
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sta ICBAH,x
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pla ; get the char back
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jsr my_CIOV ; go do it
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bmi ser_error
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lda #0
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tax
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rts
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;----------------------------------------------------------------------------
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; SER_STATUS: Return the status in the variable pointed to by ptr1.
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; Must return an error code in a/x.
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;
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SER_STATUS:
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; fall through to SER_IOCTL
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;----------------------------------------------------------------------------
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; SER_IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
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; specific data in ptr1, and the ioctl code in A.
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; Must return an error code in a/x.
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;
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SER_IOCTL:
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lda #<SER_ERR_INV_IOCTL ; We don't support ioclts for now
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ldx #>SER_ERR_INV_IOCTL
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rts
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;----------------------------------------------------------------------------
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; SER_IRQ: Not used on the Atari
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;
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SER_IRQ = $0000
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;----------------------------------------------------------------------------
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; SER_INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present.
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; Must return an SER_ERR_xx code in a/x.
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SER_INSTALL:
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; check if R: device is installed
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ldy #0
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search: lda HATABS,y ; get device name
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cmp #'R'
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beq found
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iny
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iny
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iny
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cpy #MAXDEV
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bcc search
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; R: device not found, return error
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lda #<SER_ERR_NO_DEVICE
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ldx #0
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rts
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; R: device found, initialize jump table into main program
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found: lda ptr3
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pha
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lda ptr3+1
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pha
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lda libref
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sta ptr3
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lda libref+1
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sta ptr3+1
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ldy #0
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lda (ptr3),y
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sta my_newfd+1
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iny
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lda (ptr3),y
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sta my_newfd+2
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iny
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lda (ptr3),y
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sta my__close+1
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iny
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lda (ptr3),y
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sta my__close+2
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iny
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lda (ptr3),y
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sta my_pushax+1
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iny
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lda (ptr3),y
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sta my_pushax+2
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iny
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lda (ptr3),y
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sta my_popax+1
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iny
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lda (ptr3),y
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sta my_popax+2
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iny
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lda (ptr3),y
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sta my_findfreeiocb+1
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iny
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lda (ptr3),y
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sta my_findfreeiocb+2
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iny
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lda (ptr3),y
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sta my___do_oserror+1
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iny
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lda (ptr3),y
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sta my___do_oserror+2
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iny
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lda (ptr3),y
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sta my_fddecusage+1
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iny
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lda (ptr3),y
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sta my_fddecusage+2
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iny
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lda (ptr3),y
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sta my_fdtoiocb+1
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iny
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lda (ptr3),y
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sta my_fdtoiocb+2
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iny
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lda (ptr3),y
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sta my___inviocb+1
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iny
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lda (ptr3),y
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sta my___inviocb+2
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iny
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lda (ptr3),y
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sta my_clriocb+1
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iny
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lda (ptr3),y
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sta my_clriocb+2
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iny
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lda (ptr3),y
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sta my_CIOV+1
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iny
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lda (ptr3),y
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sta my_CIOV+2
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;iny
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pla
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sta ptr3+1
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pla
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sta ptr3
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lda #<SER_ERR_OK
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tax ; A is zero
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rts
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; enable concurrent rs232 mode
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; gets iocb index in X
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; all registers destroyed
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.proc ena_cm
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lda #40 ; XIO 40, start concurrent IO
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sta ICCOM,x
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sta cm_run ; indicate concurrent mode is running
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lda #$0D ; value from 850 manual, p62. must be $0D?,
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sta ICAX1,x ; or any non-zero?
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lda #0
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sta ICAX2,x
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lda #<recv_buf
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sta ICBAL,x
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lda #>recv_buf
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sta ICBAH,x
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lda #<RECVBUF_SZ
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sta ICBLL,x
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lda #>RECVBUF_SZ
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sta ICBLH,x
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jmp my_CIOV
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.endproc ;ena_cm
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