HP 48G with 128K RAM?

[Raymond Del Tondo]

Many 48G units have been upgraded to 128 or 256 K , some to 512, 768 or even more K of RAM.
I had several of them, and a few with 768K and 1.2M, and one with 2.3MB of RAM.

There were at least two or three companies in Germany who offered the upgrade.
In the early years one or two companies dismantled the unit by pulling off the keyboard overlay and drilling out or cutting the heat stakes. These units are easily recognized because of their slightly "wavy" overlay. The other method was/is to take off the back case half (see Han's nice description on that)

If done well, you won't see any damage from opening the unit.

The last company in germany who offered the upgrade service was Dynatech, where I bought a new HP 48G+ with speedup and 1.2MB of RAM .
The actual upgrades were done by Mr. Kemper from Miketech.