DEC DECpc LPx User Manual

Digital DECpc LPx/LPx+ Service Procedures
MCS Logistics Engineering - Nijmegen 41
LPx Main Logic Board Jumper Settings
Settings shown in bold italics are factory defaults.
Feature
Description
Setting
Factory test
Normal
MFG test
J16, open
J16, jumpered
Video display type
Mono monitor
Color monitor
J15, open
J15, jumpered
CPU clock input
50 Mhz
40 MHz
33 MHz
25 MHz
J24, open
J25, open
J26, open
J24, open
J25, open
J26, jumpered
J24, jumpered
J25, open
J26, jumpered
J24, jumpered
J25, jumpered
J26, open
Cache size select
0 KB
128 KB
256 KB
J35, open
J36, open
J37, open
J38, open
J35, pins 1 and 2 jumpered
J36, pins 1 and 2 jumpered
J37, pins 1 and 2 jumpered
J38, pins 1 and 2 jumpered
J35, pins 2 and 3 jumpered
J36, pins 2 and 3 jumpered
J37, pins 2 and 3 jumpered
J38, pins 2 and 3 jumpered
Recovery mode
Recovery mode
Normal operation
J14, jumpered
J14, open
VL bus write wait state
Zero wait write
One wait write
J27, pins 1 and 2 jumpered
J27, pins 2 and 3, jumpered
Reset switch
Enable
Disable
J33, jumpered
J33, open
RDY signal type
VLRDY->CPURDY (VL bus
ready connects to CPU bus
ready)
VLRDY->LRDY (VL bus ready
synchronized through chipset
J28, pins 1 and 2 jumpered
J28, pins 2 and 3 jumpered

DEC DECpc LPx Specifications

General

Brand	DEC
Model	DECpc LPx
Category	Desktop
Language	English