HP Portable Plus - ROMBO 128 KB EPROMS?

[Dave Frederickson]

(07-19-2020 08:34 AM)Martin Hepperle Wrote:  I would especially be interested in the pinout/connections of this 28 to 32 adapter.

This wouldn't be hard to reproduce. The ROM pinout is on Technical Reference Manual p. K-4 and the pinout for a 128k 32-pin DIP is readily available. A 4-pin adapter will be needed to connect the additional pins to the programmer and the module will need a header for the additional signals along with a couple of jumpers to switch A16, A15, and VPP.

As far as programming, VGER can generate two 64k odd/even images that could be shuffled together to make the 128k bin file.

Dave