From: Dave Wood (jerepigo@xxxxxxxxxxxx)
Date: Thu Sep 21 2000 - 19:44:11 GMT-3
The NVRAM unit is located inside (at the top) of the router as I
recall.
We are going back into the darkest recesses of my memory here.
This unit did have a battery (sealed inside a black rectangular
plastic container), which provided power for the NVRAM.
The lithium battery backup on the RP retains the system config and MAC
layer addresses in NVRAM.
As for the jumpers, here is some basic info.
The AGS+ processor card, (CSC/3 or CSC/4) has a row of 25 jumper pins,
similar to the ascii art provided.
Pin25 : : : : : : : : : : : : : : : : : : : : : : : : : : Pin0
Setting a jumper on pin 0 ==> System is booted manually with the b
(boot) command, from the system bootstrap program.
Setting a jumper on pin 1 ==> System boots from the default ROM
software.
Pins 4->7 are unused, and should be left cleared.
Pin 8 controls the (break) key. Cleared allows a break signal, a
jumper prevents a
break.
Pin 9 is the secondary bootstrap when netbooting, and the pin is often
removed - if not leave this un-jumpered.
Pin 10 allows a broadcast address of all zero's if jumpered. Leave
this un-jumpered, you definately want a broadcast of all one's.
Pins 11 & 12 control the baud rate for your console.
11 & 12 unjumpered give you 9600.
11 jumpered and 12 un-jumpered give you 4800.
11 un-jumpered & 12 jumpered give you 1200, &
11 & 12 both jumpered give you 2400.
Pin 13 jumpered causes the router to attempt booting from ROM after 5
unsuccessful attempts at booting from a file off the network.
Pin 14 controls the network & subnet portions of the broadcast
address, and references the setting of pin 10. Leave this unjumpered.
Pin 15 when jumpered causes the router to produce a detailed CPU
self-check, with display of messages, and for password recovery. When
left un-jumpered, this will provide for normal router operation. Leave
un-jumpered.
Pins 16, 17, 18, 19 & 24 are not used.
Pins 20, 21, 22 & 23 are not used in normal operation, however they
can be used to invoke Slave mode, external reset, processor halt and
cache disable mode.
Hope this helps.
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