test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

by RodSmallwood＠mail.ediconsulting.co.uk

Hi I recently aquired a complete PDP-8/e. As it had not run for a while I took the usual precautions of reforming the electrolytics in the PSU as well as dismantling the whole system and cleaning everything. I was rewarded with a working system. I started to run some simple toggle in programs and got to the stage of driving a VT 320 with a display of whole the character set at 110baud. I was about to toggle in the next test which would have been a keyboard echo routine when I discovered I could no longer load anything into memory. Load address works but setting the data to load into memory in the switch register and raising DEP no longer writes the data to memory. . RUN works so it looks like the timing plus the RUN/STOP flipflop are running ok. However one shot operations like DEP and EXAM are difficult to diagnose as is hard to see a one off 500nS pulse. I don't think its the memory itself ( 4 x 4K of core) as I have tried each 4K bank on its own with the same result. I do have the CPU manual and a decent Tektronix scope. Has anybody any suggestions? Rod Smallwood

16 years, 1 month

Loading an OS onto a real PDP-11 - not an emulator

by ajp166＠bellatlantic.net

> >Subject: Loading an OS onto a real PDP-11 - not an emulator > From: Doug Jackson <doug at stillhq.com> > Date: Sun, 23 Mar 2008 18:51:02 +1100 > To: cctalk at classiccmp.org > >Hi List, > >Following the wonderful advice so for, My shiny PDP 11/04 has now been >upgraded to a 11/34, and I have a temporary terminator pack for my RL01 >disk drive. > >I suspect that I have a system that is capable of booting. - Wo Hoo. >(read - the disks spin, and the fault light stays off.....) > >My final problem (Dont hold me to that though) is that I while I have a >number of disk packs, I don't believe that I have anything to boot!! >The packs are not really usefully labeled. > >Having trawled the list, I can find many many messages about archiving >data off RL disk packs, and onto archival systems (such as emulators, >etc) - bit I cant find anything about how to take a disk image, and put >it onto an real RL01 attached to real PDP11 where there is no other >media... I suspect that I have to load in a serial receiver program, >and dump an image - but the details are so far, sparse.... > >If somebody could provide some pointers - that would be awesome..... In >an ideal world, I would be able to get RSTS onto this system (I have >dual RL01's - so that may not work) - Alternately, just being able to >boot RT11 to load a Forth interpreter would also work. [Yes, this is >where I admit to being a Forth person - I hope people will still want to >talk to me having admitted that] Two ways I know of and they are essentailly the same. Create a pack on a working system or bring up a pack from a working sytems. Other options are a floppy based bring up (RT11 fits on floppy) or maybe loading core via serial line with a bottable image. Last option is emulateted Tu58 where the PC acts as a TU58 with RT11 and you use a serial line to boot and run fromt hat to create a RL pack. IN any case I don't think anyone has come up with a way to write a RL from a PC directly. Generally every one has at least one other media (RX01/2 or RX50 OR TK50, TUxx) for portability. It's look at the option where someone creates a pack for you or loans a pack or the emulated TU58 option. Allison >Thanks > >Doug

16 years, 1 month

RK05 rack slides?

by mcguire＠neurotica.com

I have the age-old problem of a bunch of RK05 drives with only the "drive" half of the rack slides, and no "rack" half. Does anyone here have a stash of RK05 rack slides? Oh, and the other thing I'm looking for is a half-height (3U, 5.25") black blank panel, of the type that's often used on the top half of the front of a 10.5" PDP-11/34 chassis. I don't have much cash to offer (still trying to recover from a stretch of unemployment earlier this year) but I have LOTS of DEC stuff to trade. Thanks, -Dave -- Dave McGuire Port Charlotte, FL

16 years, 1 month

goodies from storage: HP9810A, PDP-11/05

by mcguire＠neurotica.com

I made a trip to my (far away) storage locker today, and brought home a few things that I hope to bring back to life in the coming weeks. First is an HP9810A. I just powered it up...Several LEDs turn on immediately, but the display is blank and the keys are unresponsive. Does anyone (Tony?) have any troubleshooting hints? Are schematics for this machine floating around anywhere? The second is a PDP-11/05. It hasn't been powered up in about twenty years, and has an empty backplane. I'm pretty sure I have all the right boards, but I'll have to dig through quite a few crates to locate them. I may do that tomorrow or Friday. Friday is my birthday (39, *shudder*) and I always make it a point to do things that I love on my birthday, and hacking on a PDP-11 definitely qualifies, so I'll probably work on it then. The first thing that sticks out about the 11/05 is that the keylock switch has a key broken off in it. At least it's in the "power" position. Does anyone have a spare key for this machine? If so, can I talk you out if it? It's not one of the ubiquitous XX2247s of which I have quite a few; it's a standard "slot" key. Thanks, -Dave -- Dave McGuire Port Charlotte, FL

16 years, 1 month

Matchpoint/DOB on 386/20?

by cclist＠sydex.com

> Date: Fri, 21 Mar 2008 17:13:27 -0500 > From: Jim Leonard > I used a Central Point Option Board on a 386sx-16 and a 386dx-40 so I'd > say you're safe. -- Jim Leonard (trixter at oldskool.org) How about the Matchpoint? Anyone? Cheers, Chuck

16 years, 1 month

Los Angeles: Commodore PET 8032's, PDP 11/73 for trade

by drew＠asideworldwide.com

Hi - I'm looking for a PET 8032 for a photo shoot in Los Angeles. Could I possibly rent one from you? Are they for sale? Thanks! Drew (310)876-0304

16 years, 1 month

Matchpoint/DOB on 386/20?

by cclist＠sydex.com

Please respond privately if you don't think a 20-year old topic is appropriate for the list. I was wondering if anyone's tried to use a Microsolutions Match Point and/or a Central Point Deluxe option board on a 386/20. I'll be using an old Micronics system (no custom VLSI) if that's any help. I'd like to find out if this works before I get out my screwdriver. Thanks, Chuck

16 years, 2 months

Semi-OT: recommend a fast, high-capacity sheet-fed scanner?

by listmailgoeshere＠gmail.com

Hi list, I'd like to pick your collective brains, if I may? I have quite a few books here which, though I'd like to keep the content, do take up a lot of space*. I'm looking at some kind of solution for scanning them, and so far "cutting the spines off and loading the pages into a sheet-fed scanner" seems likely to be fastest - I can't afford an automatic book scanner, and whilst there are units like the Mustek OpticBook range, it'd take forever to be there picking the book up, turning the page and replacing it for each scan. This is only semi-OT inasmuch as I know various people on the list need to scan classic-computer-related documentation from time to time, so this info may be useful to others. So - does anyone know of a make/model scanner which has a high (ideally 100 pages or more) sheet-feed capacity, is fast (ideally SCSI, maybe USB2, Firewire is third choice) and produces good results for this sort of thing? New or secondhand is fine. Thanks, Ed. * nothing of any historic or cultural significance - mainly just recipe books. I wouldn't destroy anything rare or important.

16 years, 2 months

Semi-OT: recommend a fast, high-capacity sheet-fed scanner?

by aek＠bitsavers.org

> So - does anyone know of a make/model scanner which has a high > (ideally 100 pages or more) sheet-feed capacity, is fast (ideally > SCSI, maybe USB2, Firewire is third choice) and produces good results > for this sort of thing? There are many. I'm currently using a Kodak 2500D, which can be found used for a few hundred dollars on eBay.

16 years, 2 months

Switch settings: Facit 4070 tape punch

by drb＠msu.edu

Hi, Looking for switch setting info for the serial (multi interface?) board in a Facit 4070 tape punch. The stencilled on labels are a little cryptic, and there's no stencil for the big chrome toggle switch on the back. Thanks, De

16 years, 2 months

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test-drb March 2008