17 Oct
2016
17 Oct
'16
10:45 a.m.
On 2016-10-17 1:47 PM, Glen Slick wrote:
On Mon, Oct 17, 2016 at 9:02 AM, F.Ulivi <fulivi at
tiscali.it> wrote:
Yes that would be it the unpopulated
positions would be for versions of
the controller using smaller ROMs, The one I have is the 4 ROM version
and I am pretty sure I dumped them, I just need to find out where.
Paul.
Hi everyone,
does anyone of you happen to have the images of the firmware ROM of
HP98034 module and/or of the HP9895 disk drive, please?
I'm working on implementing these devices on my MAME-based simulator of
HP9845B systems.
Where is the firmware on the 9895A? Is it in a 24-pin DIP package mask
ROM near the lower right corner of this picture?
http://www.hpmuseum.net/images/09895-66500-26.jpg
Hmm, looking in the service manual it appears there were several
versions of the controller board. Some with multiple PROMs and some
with a single ROM, and some with a Z80 and some with an MC2
(micro-CPU, the '2' is a superscript).
http://www.bitsavers.org/pdf/hp/disc/07902-90030_7902_9895_Svc_Jan81.pdf
I have a 9895A. Don't know which version of the controller PCB it has
without digging it out to take a look. 