American Megatrends 39 Series, Руководство пользователя

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AMI Baby Voyager User's Guide
85
Appendix A
Upgrading to 256 KB Cache
Parts
You need 64 KB x 4 static RAM chips with an access time of 17 ns.
The part number is Toshiba® TC5546P-17 or an equivalent part. There
are 8 pieces in this part. This part is available from AMI.
Procedure
Step Action
1 Move jumpers J21 and J22 towards the 256K side. The positions
for J21 should be (1, 2 shorted).
The positions for J22 should be (1, 2 shorted).
2 Place a jumper across J36 to implement 256K cache. The positions
should be J36 (1, 2 shorted).
3 Remove the static RAM from U33. This RAM is not required for
256 KB cache operation.
4 Remove the 22-pin 16 KB x 4 static RAM chips from U38, U39,
U41, U42, U45, U46, U48, and U49.
5 Place the 24-pin 64 KB x 4 static RAM chips in U38, U39, U41,
U42, U45, U46, U48, and U49. Make sure that the pins are straight
and that all pins are inserted in the receptacles.
6 Turn the system on. The Boot Screen should display 256 KB of
cache memory. If 256 KB does not display, check for bent pins on
the new SRAM chips.