IBM AT Piggyback Memory

From: Hans Franke <franke_at_sbs.de>
Date: Tue Oct 20 07:08:02 1998

>> In rummage through the dark recesses of my garage (too densly packed to let
>> in light) I again ran across an IBM AT motherboard that used the piggyback
>> memory chips. Were there any other computers that used these things?

> The Apple /// 128K memory board used 32 pieces of standard 16K DRAM, and
> 16 pieces of 32K (stacked 16K) DRAMs.

> Several TI calculators including the TI-58 and TI-59 use stacked DIPs for
> RAM.

> The HP-41CX calculator uses stacked DIPs for ROM and RAM.

The first Atari ST520+ and 260+ used stacked chips. Atari
decided short before delivering the first units that they
had to double the RAM size (Never woundered why the 260+
had 512K and the 520+ had 1Meg ? 260 -> 260 decimal kBytes
and 520 -> 520 decimal kBytes, both numers are rounded in
favour for the marketing .) Ther have also been real
260s and 520s with 256K and 512K.

Gruss
H.

--
Ich denke, also bin ich, also gut
HRK
Received on Tue Oct 20 1998 - 07:08:02 BST

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