13 Sep
2010
13 Sep
'10
3:28 p.m.
I thought hte HP9825T had most of the ROMs built-in.
IIRC, the only ones
that are misisng are the disk ROMs anmd the Matirx ROM (those have to be
added as front-port modules). If this is the machine I am thinking of,
the IO ROM is built in.
That's right. The Extended I/O ROM is built in. Under the cover, the following
are listed:
9872A plotter, Genereal I/O, Extended I/O, Adv. Programming, String, Sytem
Programming
From the hp9825.com site, I gather that it should be
possible to transfer
programs to and from the 9825 in ASCII format via the serial
card and some Sytem
Programming ROM routine. Not exactly the same as mass storage, but better than
nothing.
> It's also advisable to add a crowbar circuit
to the psu the 723 regulator
> IC's and power transistors don't life forever. When they go you will be
> grateful for adding the crowbar circuitry.
Seconded!
I plan to do this. Any pointers from those who have done the mod?
-tony