http://www.classiccmp.org/hp/9800.htm

From: Vassilis Prevelakis <vp_at_mcs.drexel.edu>
Date: Wed Aug 27 19:31:33 2003

On the section on the 9825 it says:
> [The 9825T] also has a large warning label on outside top warning the
> user not to install any ROMs other than the 98211 Matrix ROM or the
> 98217A Flexible Disk Drive ROM. It says that installing any plug-in ROM
> that is already built into the calculator may damage the machine. I
> have never seen this warning on ANY other HP machine.

Actually the HP Series 80 computers also have a similar message (to the
effect that installing multiple copies of the same ROM could damage
the machine).

**vp
Received on Wed Aug 27 2003 - 19:31:33 BST