test-drb August 2009

test-drb@ccmp.vtda.org

148 participants
169 discussions

PDP-8/11 bus interfacing ICs (Tobias Russell)

by gerhard.kreuzer＠liftoff.at

Hi Toby, please keep me informed, if you find some solution, I am also thinking of some project, but I want to develop an universal spare board, so you can easily replace a DEC board to find problems easier. With best regards Gerhard www.compuseum.at

15 years, 4 months

MacLynx 2-7-1 sources

by spectre＠floodgap.com

Because I have nothing else to do, and because I actually did use MacLynx on my IIsi when all I had was 4MB of RAM and dialup SLIP, I decided to see if I could update MacLynx (which is based on the old Lynx 2-7-1) to something in the 2.8 range. However, I can't find the sources anywhere, and the Wayback Machine copy of the original site truncates the sources (1.5MB) at 1MB. Anyone out there still have a copy of this source code rotting somewhere? -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- What's another word for thesaurus? -----------------------------------------

15 years, 4 months

Re-request for 11/40 unibus clarification...

by derschjo＠mail.msu.edu

I'm still trying to figure out what's gone wrong with the unibus on my 11/40. To recap -- the machine is responsive if I run it without a terminator at the end of the bus; with a terminator installed the front panel is unresponsive. I've checked the following: - The NPG grants are continuous from the front to the back. - There are grant continuity cards in each empty slot. - I am running with a minimal configuration (only CPU and 64K MOS memory) I made one final discovery about two months ago -- the SPC slot in slot 9 of the main CPU backplane (which I am 100% sure is an SPC slot and not some special-purpose slot) does not work properly. I cannot get the Console SLU/LTC board to function when installed in slot 9 (which is where it's typically installed, or so I hear). It works fine in other unibus slots. I have three questions, any help on these would be, well... helpful. I'm hoping to have some time to play around with it in the coming months. 1) Is the NPG grant on the SPC slot on the processor backplane (slot 9) supposed to be connected to the NPG grants on the Unibus expansion? That is -- right now if I set my DMM to continuity mode and put one probe on CA1 on the first slot of the unibus expansion, and the other on CB1 on the last slot of the unibus expansion, since all NPG grant jumpers are in place, the DMM shows the circuit as closed. This is as I'd expect. However, if I move the probe from CA1 on the first slot of the expansion to CA1 on slot 9 of the processor backplane, the circuit is then open. I'm guessing this is not correct. (There is currently an NPG jumper installed on slot 9.) All other grant lines seem to be continuous. 2) Where is the +15V to the processor backplane supposed to be connected? (I suspect this may be the reason the SLU won't function in slot 9...). Right now it's plugged into pin CV1 on slot 9 (if I'm reading the Unibus pin chart right :)) but the docs I have found say this should be ACLO_L... 3) Does anyone have a wirelist for the 11/40 CPU backplane (or is this in any of the service/reference manuals)? Worst case, I can probe out the wiring and figure out what's missing/incorrect on slot 9. Thanks as always... Josh

15 years, 4 months

I'm sure someone has info on this...

by tiggerlasv＠aim.com

On Sun Aug 2 07:25:04, Pete Turnbull wrote: -- Snip -- You mean a "microPDP-11/23". The badge could be any of the microPDP-11 series, as far as I can see. -- Snip -- The badge appears to say "Micro PDP-11" with no suffixes. 11/73's and 11/83's and 11/93's have their own badges, assuming it wasn't an upgrade. I can't speak to the 11/53. My intent was to just list the most likely contents of the chassis, so the poster could get an approximation of what kind of CPU and device(s) to expect, although I should have been more precise, and said "PDP-11/23+ BASED system", since the "Plus" only calls out the quad board vs the dual. -- Snip -- If it were an 11/23 variant it would much more likely be an RQDX1, but that's very similar. -- Snip -- It was my (mis?) understanding that the later BA23's had the black buttons on the front panel, which to me would suggest the chassis has the FCO'd power harness, and an RQDX2, for RD53 support. But again, this is all speculation. For all we know, there could be an 11/83 in there, with a RQDX3, DHQ11 and SCSI. ;-) T

15 years, 4 months

N8VEM project status

by lynchaj＠yahoo.com

Hi All! It's been a while so I thought I'd post an update on the N8VEM home brew computing project. There are now 7 PCBs available for builders to build their own system; the Z80 SBC, ECB backplane, ECB bus monitor, ECB prototyping board, Disk IO (IDE & FDC), Zilog Peripherals (CTC, DART, & dual PIO), and the 6809 host processor. All the boards have been built by multiple builders so by now we know they work and most of the bugs found. There are a variety of builder projects underway and there is always room for new ones. I am presently working on a VDU board for composite character mode video with PS/2 keyboard and mouse support. The prototype is working and the PCB is in trace layout. I am also working with another builder to make a Propeller based IO board called the PropIO. I have a prototype assembled and some functionality. When it is done, it will provide VGA video support, PS/2 keyboard, and micro SD storage. Especially if you've been itching to build that new peripheral board or custom SBC please consider joining us and using the substantial resources available for home brew computing hobbyists. If anyone would like to join the N8VEM project and build their own home brew computer please contact me by email. Thanks and have a nice day! Andrew Lynch

15 years, 4 months

PDP-8/11 bus interfacing ICs

by toby＠coreware.co.uk

I've just got some prototyping boards from Douglas Electronics that I'm planning on using to build some prototype cards for my -8s and -11s. My intentions are to develop an interface to a PC to implement some virtual storage devices. If all goes well I'd like produce these cards in small volumes and so I'm keen to use off the shelf components as far as possible. The main problem of course is the bus receivers and drivers as these are pretty much unobtainable as far as I can tell. I'd therefore like to find suitable alternatives. Does anyone have any suggestions of suitable devices? Examples of chips I'm looking to replace are the DEC 8881 driver, DEC 8640 (or DEC 380) receiver. Thanks, Toby -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

15 years, 4 months

Russian emulator announce preliminary PDP11 emulation

by stephane.tsacas＠gmail.com

From: http://soviet-pc.narod.ru/changes.html - added simple script editor with syntax highlighting; - more visible drive icons flashing on access; - preliminary implementation of PDP-11 compatible 16-bit CPU; - added configs of Soviet PDP-11 compatile home comuter "BK-0010.xx". - preliminary implementation of Motorola 68000 32/16-bit CPU; - added config of Sega Genesis console (not workable, to test CPU); - some other small changes, fixes, cleanups and improvements. -- Stephane http://3w.posterous.com

15 years, 4 months

I'm sure someone has info on this...

by mdavidson1963＠gmail.com

Ebay item #250475444508 It's listed as a complete PDP-11. I was hoping someone could shed some light on this system, as it looks interesting. Thanks. Mark Davidson mdavidson1963 at gmail.com

15 years, 4 months

FS cheap: PC-related manuals

by charlesmorris800＠centurytel.net

While cleaning I found, still sealed in the original shrink wrap and marked "For Distribution Only With a New PC": Microsoft MS-DOS User's Guide (6.22) Microsoft Windows User's Guide (think it's 3.0 or maybe 3.1) Lotus Organizer Release 1.1 User Manual ... also, unwrapped, but in good shape: ClarisWorks Handbook for Windows DeskMate User's Reference dated 2/91 Please make any reasonable offer (gas & beer money :) if interested, before I pitch them in the dumpster... shipping from zip 65775. thanks Charles

15 years, 4 months

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test-drb August 2009