Configuration Switches - NCR PC4I Technical Reference

SYSTEM OVERVIEW
CONFIGURATION SWITCHES
The main processor board includes eight configuration
switches which require setting as illustrated in
Figure
1.8,
before the computer is used for the first
time, and after any of the hardware features
concerned has been changed.
These switches can be read by software. This is
explained in the description of the Parallel
Input/Output Interface in Chapter 2.
One or• more jumper· sw:i. tches are present on the ma:i.n
pr·ocessor· board (see Figure
1.
7). The jumper· switch
block consists of either
J5
or· the three jumpe1·s
J1,
J2, and J3. The significance of the jumpeP settings:
1-16
JP1 closed
->
Enable flexible disk drives
JP2 closed
->
Enable standard serial I/0
JP3 closed
->
Enable parallel interface
JP5 closed
->
Enable standard serial I/0
Option Board
Connectors
Switch
Block
D
JP 1 JP3
I I I
1
JP2
Figure 1.7 System Configuration Switch Locations