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8M VME 3/2xx,3/4xx,4/2xx
Eight megabytes of ECC memory consisting of 256K x 1-bit chips, with onboard
All locations are with component side up and the VME connectors away from you.
There is a socket for a 220/270-ohm terminator pack 120-1613 at location F34
(U1203). Whether this terminator is installed depends on the machine the
board is in, and the board's location.
For a 3/2xx, the first memory board must be in VME slot 6 and must have the
terminator pack installed. "Remove the terminator when expansion memory
boards are installed in slots 2, 3, 4, and 5" -- which is impossible because
only four boards are supported, with the other three boards being in slots
2-4. Memory boards not in slot 6 should not have the terminator pack
For a 3/4xx or 4/2xx, the memory board in VME slot 1 should always have the
terminator pack installed. If there are memory boards on both sides of the
CPU, remove the terminator at U1411 on the 3/4xx CPU and install a terminator
pack on the memory board in slot 7.
There are four jumpers.
J0101 (block in far left corner)
1-2 external clock UNJUMPED
3-4 ??? UNJUMPED
J1101 Disable refresh (single jumper in far left) UNJUMPED
J0301 probably not present
J0302 near left corner (accessible through top of back edge, position 0 at
0 first memory board
1 second memory board
2 third memory board
3 fourth memory board
There are five LEDs on the upper rear edge of the board. In normal operation,
only the two green LEDs should be lit.
UE Uncorrectable error (when lit) RED
CE Correctable error (when lit) YELLOW
DIS CPU access disabled (when lit) YELLOW
CPU CPU accessing memory GREEN
This LED flickers because it is only lit when the CPU is actually accessing
the memory on the board. If the LED is not flickering, that simply means
you have more memory than you need at the moment -- the board is not being
REF Refresh OK (when lit) GREEN
If this LED is not lit, refresh has failed and the board should be repaired
Note that this board must be 501-1102-11 or later to use with the 3/4xx, the
FPA, or the FPA+.
Power requirements are 5V @ 12.3A.
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Last modified: 2000.10.25.21.13.32 CDT
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