Digital Equipment PRIORIS MTE, Service Maintenance Manual, Page: 30 / 73

Service Procedures Digital PRIORIS MTE Server
30 MCS Logistics Engineering - Nijmegen
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Main Logic Board Jumpers
Jumper pins allow to set specific computer parameters. They are set by changing the pin location of jumper
blocks. A jumper block is a small plastic-encased conductor (shorting plug) that slips over the pins. Place the
jumper over the two pins designated for the desired setting. Press the jumper evenly onto the pins. Be careful
not to bend the pins.
Note that the square pin of each jumper block is pin 1.
CAUTION
Do not touch any electronic component unless you are safely grounded. Wear a
grounded wrist strap or touch an exposed metal part of the server chassis. A static
discharge from your fingers can result in permanent damage to electronic components.
Main Logic Board Jumper Settings
Setting in bold italics are factory default settngs.
Feature Description Setting
BIOS top 8K reprogram Reserved for factory use only J43, open
CPU Select
P24T
486 DX or DX2 J52, pin 1 and 2 jumpered
J52, pin 2 and 3 jumpered
RESET switch Enable
Disable J46, jumpered
J46, open
Parallel port type Printer
Bi-directional
J20, pin 1 and 2 jumpered
J20, pin 2 and 3 jumpered
Factory test/clear password Normal Operation
Factory test/clear password J23, open/parked
J23, jumpered
Display type Color
Mono J25, jumpered
J25, open
CPU Clock input
50 MHz
40 MHz
33 MHz
25 MHz J34, J35, J36, J37 open
J36 jumpered, 34, 35, 37 open
J35 open, 34, 36, 37 jumpered
J36 open, 34, 35, 37 jumpered
Cache size select 128 KB
256 KB J29, J30, J31 pin 1 and 2
jumpered
J29, J30, J31 pin 2 and 3 jumpered
VL-Bus write wait state
Zero wait write
One wait write J51, pin 1 and 2 jumpered
J51, pin 2 and 3 jumpered
NOTE J20 is functional for 87c311 only. When the I/O system uses 87c312, this jumper is
ignored.