B&B Electronics Parallel Printer Card PIOC User Manual

Page 7

Documentation Number PIOC2595 Manual

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5105

Table 5 - Register Functions and Pinouts

NOTE 1: An "X" means no connection to any DB-25 pins.

NOTE 2: Bit 4 of the Control Register (37AH) as an output is used
to control IRQ7. When this bit is high, IRQ7 is enabled and when
this bit is low, IRQ7 is disabled. As an input this reads the status of
the Interrupt Enable.

NOTE 3: This bit is used to control the direction of the Base
Register (378H). Outputting a “1” to this bit defines the lines as
inputs. Outputting a “0”, which is default, to this bit defines the lines
as outputs.

BIT

Base (378H)

Status (379H)

Control (37AH)

OUTPUT INPUT OUTPUT INPUT OUTPUT

INPUT

0 2 2 X X 1

1 3 3 X X 14 14
2 4 4 X X 16 16
3 5 5 X 15 17 17
4 6 6 X 13

See Note 2

See Note2

5 7 7 X 12

See Note 3

6 8 8 X 10 X

7 9 9 X 11 X