What H8 stuff do you have? Are you intersted in parting with any of it? I have an h8 that I have no s/w, no schematics, no docs or anything else for. thanks. -Bob bbrown(a)harper.cc.il.us #### #### Bob Brown - KB9LFR Harper Community College ## ## ## Systems Administrator Palatine IL USA #### #### Saved by grace

Jerome Fine replies: I have watched to this thread and I have a question. I have heard that the Heath hardware might be able to run a modified RT-11 form the PDP-11. Is this true and is so, what modifications were needed? Sincerely yours, Jerome Fine

That is probably on the H11 (not the h8)..the h11 was suppossed to be pdp compatable. -Bob On Wed, 11 Apr 2001, Jerome Fine wrote:

--- Bill Gunshannon <bill(a)cs.scranton.edu> wrote: My H-11 came with a KDF-11 CPU (11/23), but I don't know if it was shipped that way or if my boss (who bought it new) upgraded it himself. I have a couple of the Heath serial cards (one unsoldered!), the H-27 disk controller, the 8" floppies and a pile of misc DEC cards (memory, BDV-11 boot card, etc). We ran RT-11 v5.something (c. 1987) with an RLV11 and RL01/RL02. Before anyone jumps in, yes, I know the RLV11 uses the CD-interconnect between the boards - my boss "extended" the width of the case with 6-32 threaded rod and made his own CD-interconnect with Heath backplane connectors and wire-wrap wire. I have folded the case back together and am trying to debug the H-27 (he never used it). Except for the monsterous holes he blew in the side to mount additional fans, and the holes in the front he added for external console baud rate switches, it resembles its original form once again. This whole thing was a development machine for an ultrasonic parts inspector. You would put the product in a water bath and the PDP-11 would run a motion controller and ultrasonic pinger that took 4-bit samples every so many milliseconds. Think of it as a slow scanner. The box had a 3rd party "scatter gather" DMA card, a high-res video card (512x512) and a bunch of PASCAL and assembler code to tie it all together. The production system was a DEC PDP-11/73 w/4Mb physical memory and a Fuji Eagle for a disk. My own development environment was a DEC PDP-11/23 (a returned "HASPBOX" I got when I worked at Software Results as a bench tech - cost me $300) with 32kW MOS memory, an RLV11 (in a BA-11N; no handmade jumpers in *my* box) and an LPV-11 w/LA180 for printing program listings. I loved the fact that since I recycled peripherals from my PDP-8/a, the $300 plus $100 for an RLV11 was my only out-of-pocket expense to have my own development machine. My job was to take a pre-existing data set and extract images according to a script and display them on the screen as a training aid, then give quizzes - all in MACRO-11 (customer spec - the listings were more than 300 pages). It was one of the hardest programming jobs I've ever had, but was one of the most fun. My bonus for getting it all done on time was a VAX-11/725 ($4000 at the time). Wish I still had it. Glad I got the H-11 when the boss moved. -ethan __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/