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SunOS 5.5 Devices mcpp(7D)

NAME mcpp − ALM-2 Parallel Printer port driver

SYNOPSIS #include <fcntl.h>

#include <sys/mcpio.h>

open("/dev/mcppn", mode);

DESCRIPTION

(PARALLEL

PORT)

The parallel port is Centronics-compatible and is suitablefor most common parallel

printers. Devices attached to this interface are normally handled by the line printer

spooling system and should not be accessed directly by the user.

The printer devices reside on a separate major device number from the serial devices.

Minor device numbers in the range 0 − 7 access the printer, and the recommended nam-

ing is /dev/mcpp[0-7].

IOCTLS Various control ﬂags and status bits may be fetched and set on anALM-2 printer port.

The following ﬂags and status bits are supported; they are deﬁned in sys/mcpio.h:

MCPRIGNSLCT 0x02 set if interface ignoring SLCT− on open

MCPRDIAG 0x04 set if printer port is in self-test mode

MCPRVMEINT 0x08 set if VME bus interrupts are enabled

MCPRINTPE 0x10 print message when out of paper

MCPRINTSLCT 0x20 print message when printer ofﬂine

MCPRPE 0x40 set if device ready, cleared if device out of paper

MCPRSLCT 0x80 set if device online (Centronics SLCT asserted)

The ﬂags MCPRINTSLCT, MCPRINTPE, andMCPRDIAG may be changed; the other bits

are status bits and may not be changed.

The ioctl() calls supported by ALM-2 printer ports are listed below.

MCPIOGPR The argument is a pointer to an unsigned char. The printer ﬂags and

status bits are stored in the unsigned char pointed to by the argument.

MCPIOSPR The argument is a pointer to an unsigned char. The printer ﬂags are set

from the unsigned char pointed to by the argument.

ERRORS Normally, the interface only reports the status of the device when attempting an open(2)

call. An open() on a /dev/mcpp∗ device will fail if:

ENODEV The unit being opened does not exist.

ENXIO The device is ofﬂine or out of paper.

Bit 17 of the conﬁguration ﬂags may be speciﬁed to say that the interface should ignore

Centronics SLCT− and RDY/PE− when attempting to open the device, but this is normally

useful only for conﬁguration and troubleshooting:if the SLCT− andRDY lines are not

asserted during an actual data transfer (as with a write(2) call), no data is transferred.

FILES /dev/mcpp[0-7] parallel printer port

modiﬁed 8 Mar 1993 7D-203

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