On Mon, Oct 17, 2016 at 9:02 AM, F.Ulivi <ful...@tiscali.it> wrote: > 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.