01271.pdf

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Tandy 1000HD
(250-1001)
Memory
Faxback Doc. # 1271
256K DRAM kits
25-1079 consists of eight 256K x 1 DRAM at 150 nanoseconds.
Memory Upgrade:
┌─────────────────────────────────────────────┐
Tandy 1000HD (25-1001) - Expand from 256K:
├──────────┬──────────────────────────────────┤
Add to the
Memory Adapter
├──────────┼──────────────────────────────────┤
384K
25-1079 (Remove all sixteen 64K)
chips from the adapter)
├──────────┼──────────────────────────────────┤
640K
(2) 25-1079 (Remove all sixteen)
(64K chips from the adapter)│
└──────────┴──────────────────────────────────┘
This computer came standard with a 25-1011 memory expansion adapter that
was fully populated with 64K X 1 DRAM chips. To increase memory to 384K
or 640K, first remove all sixteen 64K chips and then add the specified
memory chips.
┌────────────────────────────────────────────────────────────┐
│Jumper
Settings
├───────┬─────────────┬──────────────────┬───────────────────┤
│Board │
Memory Kit
Jumper
Memory Level
├───────┼─────────────┼──────────────────┼───────────────────┤
│25-1011│
25-1079
E1-E2
384K
├───────┼─────────────┼──────────────────┼───────────────────┤
│25-1011│(2)
25-1079
no jumpers
640K
└───────┴─────────────┴──────────────────┴───────────────────┘
(jej-05/11/94)
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