hp-85A & 128K mem module question

From: Vassilis Prevelakis <vp_at_mcs.drexel.edu>
Date: Mon Mar 31 19:44:40 2003

Innfogra_at_aol.com wrote:
> Does anyone know what command or process you would use on a HP-85A to verify
> that the 128K Memory Module that plugs into the back of The HP is working.

The Instruction sheet for the HP 82907A (32K), HP 82908A (64K) and
HP 82909A (128K) Menory Modules states:
    "The HP 82907A, HP 82908A, and the HP 82909A Memory Modules
     cannot be used with the HP-83 and HP-85 Personal Computers."

The note obviously refers to the HP-85A, since the HP-85B *can* utilize
these modules as RAMDISCs.

So you need either an HP-85B, an HP-86, or an HP-87 to use your 128Kb module.

> I seem to remember that the 85A needs a ROM to use a 128K Memory Module.

You may be thinking of the 00087-15012 Electronic Disk (EDISC) ROM which
allows memory to be used as RAMDISC. This ROM is built into the HP-85B
while it is optional for the HP-86/87.

Sorry.

**vp
Received on Mon Mar 31 2003 - 19:44:40 BST