PORTIBM PC Portable (uses same BIOS as XT) 03BC-03BF - PARALLEL PRINTER PORTIBM PC Portable (uses same BIOS as XT) (MDA(Monochrome Display Adapter) A text-only video adapter introduced together with the original IBMInternational Busiuness Machines PCIBM PC.  See also CGAColor Graphics Adapter, HGC.'s LPT1)
Range:	PORTIBM PC Portable (uses same BIOS as XT) 0278h, PORTIBM PC Portable (uses same BIOS as XT) 0378h, or PORTIBM PC Portable (uses same BIOS as XT) 03BCh
SeeAlso: MEM 0040h:0008h

03BC  -W  data port
03BC  R-  bidirectional port: input from connector
	  unidirectional port: last value written to port
03BD  R-  status port (see #P0658)
03BE  RW  control port (see #P0659)


Bitfields for parallel interface status port:
Bit(s)	Description	(Table P0658)
 7	busy
 6	NOT acknowledge (approx. 5us low pulse)
 5	out of paper
 4	printer is selected
 3	*no* error
 2	IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. has *not* occurred
	(PS/2IBM PS/2, any model) printer returned -ACK
 1-0	reserved
Note:	if bit 2 is clear (i.e. an interrupt has occurred), it is set again on
	  reading the status register
SeeAlso: #P0659


Bitfields for parallel interface control port:
Bit(s)	Description	(Table P0659)
 7-6	reserved
 7	(see PORTIBM PC Portable (uses same BIOS as XT) 037Bh bit 7)
 5	(PS/2IBM PS/2, any model) enable bidirectional port
	(also requires enabling via PORTIBM PC Portable (uses same BIOS as XT) 0102h)
 4	enable IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. (via -ACK)
 3	select printer (SLCT IN line)
 2	=0 initialize printer (-RESET line)
 1	automatic line feed
 0	strobe (must be set for minimum of 5 microseconds)
SeeAlso: #P0658