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HP 75 Expansion Pod
07-18-2015, 02:46 PM (This post was last modified: 07-18-2015 02:49 PM by Paul Berger (Canada).)
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RE: HP 75 Expansion Pod
The memory inside the POD is 8K SRAMs and it would seem it auto-configures so yes it is possible that you have a bad chip or perhaps it was only populated with 3 SRAMs. You can upgrade then, I upgraded two of the three I have, but it will depend on your soldering skill. The SRAMs are in 28 pin SOP package, and upgrading is just a matter of populating the remaining SRAMs. It may be possible for it to be larger, however there is only pads on the board for 8 SRAMs, and the logic driving the chips is buried in a custom chip. It is possible that there may be technical information available, but I have never seen nor heard of it. I do have suitable 8K SRAMs that have been desoldered if you have trouble finding parts. When taking apart the POD be careful of the cable from the connector to the circuit board inside it is just a flexible circuit board.
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HP 75 Expansion Pod - Michael Fehlhammer - 07-18-2015, 11:29 AM
RE: HP 75 Expansion Pod - Paul Berger (Canada) - 07-18-2015 02:46 PM



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