Srom Selection Jumpers; Table C-12 System Board Jumpers; Table C-13 Srom Selection Jumpers - Digital Equipment AlphaStation 500 Series User Information

Technical Specifications

Table C-12 System Board Jumpers

Jumper
J6
J9
J10
J18
J2, J20, J33, J35
(*) = Default position.

SROM Selection Jumpers

SROM jumpers are used for debug purposes by manufacturing and field service. There are
eight loadable images in the SROM device. The SROM selection jumpers select which
output from the SROM drives the EV5 CPU. Figure C-1 show the SROM selection jumper
locations. Table C-13 lists the encoding for the SROM selection jumpers. Only one jumper
may be installed at any given moment.

Table C-13 SROM Selection Jumpers

Jumper
J11
J12
J13
J14
J15
J16
J17
J19
C-12 AlphaStation 500 Series User Information
Pins 1 to 2 Pins 2 to 3
Reset* Halt
Secure Console Enabled Secure Console
Disabled*
Alternate Console Primary
Enabled Console
Enabled*
FROM Write Protect Write Enabled*
SROM Bit Function
0 Power Up (default)
1 Mini-Console
2 Floppy loader
3 MFG Memtest
4 RESERVED
5 RESERVED
6 MCHK Mini-Console
7 Noinit Mini-Console
Function
Changes front
push button
function
Secure console
Alternate console
Controls 12 volts
for the FROM
Ground reference
jumpers for
debug