Specifications

Little Board™/486e Technical Manual

2–26

Note

For maximum reliability, keep the cable between the board and the

device it drives to 10 feet or less in length.

Table 2–21 defines the register bits shown in the Signal Name or Function column of Table 2–19.

Table 2–21. Standard and PS/2 Mode Register Bit Definitions

Signal

Name

Full Name Description

-ERR Error Reflects the status of the -ERROR input. 0 means

an error has occurred.

SLCT Printer selected status Reflects the status of the SLCT input. 1 means a

printer is on-line.

PE Paper end Reflects the status of the PE input. 1 indicates

paper end.

-ACK Acknowledge Reflects the status of the ACK input. 0 indicates a

printer received a character.

-BUSY Busy Reflects the complement of the BUSY input. 0

indicates a printer is busy.

STROBE Strobe This bit is inverted and output to the -STROBE pin.

AUTOFD Auto feed This bit is inverted and output to the -AUTOFD pin.

-INIT Initiate output This bit is output to the -INIT pin.

SLC Printer select input This bit is inverted and output to the pin. It selects

a printer.

IRQE Interrupt request enable When set to 1, interrupts are enabled. An interrupt

is generated by the positive-going -ACK input.

PCD Parallel control direction When set to 1, port is in input mode. In printer

mode, the printer is always in output mode

regardless of the state of this bit.

PD0-PD7 Parallel Data Bits