test-drb

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101090 discussions

by r_a_feldman＠hotmail.com

A friend who used to work as a software trainer for DEC sent me the following link (https://m.youtube.com/watch?v=uIqlMfSCs0E), which points to an hour-and-a-half-long YouTube video from June 2021 about the history of DEC. It is a Zoom presentation from the Maynard Public Library done by a local newspaperman. It is fairly general, but was attended by a number of former employees, some of whom made comments.

2 years, 1 month

FreHD

by bill.gunshannon＠hotmail.com

Here's one for the memory banks. I have a number of TRS-80's. Back when they first came out I bought a couple of the FreHD Hard Disk Emulators made by Fred Vecoven. They worked great and made life a lot easier. Then, I had reason to put everything away for a long rest. I just pulled them out and set them up again. Neither of them does anything. As a matter of fact, in my 4P they even keep the system from booting from floppies. Anybody else run into something like this? Is there something that would go dead if they sat idle for several years? I checked the CR2032 batteries and they are still alive so it's not like they ran out of power or anything. Any hints? bill

2 years, 1 month

MAN-3A display

by charlesmorris800＠centurytel.net

Looking for a couple of MAN-3A (single character, seven-segment red LED display) to restore a '70's pocket calculator. One digit is missing a segment. I had another 3A in my LED drawer - and IT has a different bad segment... aargh. No luck searching the usual places online. Can anyone help? thanks.

2 years, 1 month

DEC ME11-L core memory expansion unit drawings

by jnc＠mercury.lcs.mit.edu

> From: Steven Malikoff > I have finally got around to scanning the print set for the DEC ME11-L > memory expansion unit Ah, thanks for that. The prints for the boards are available, in the PDP-11/05 Engineering Drawings (on pp. 115-137), but the MF11-L backplane was previously missing. (The -11/05 generally mounts MM11-L sets in the main CPU backplane, so the MF11-L backplane is not included in the -11/05 prints.) It is the non-parity MF11-L backplane (DEC part number 54-09959), not the parity one (part number 54-10331), though. (My theory is that the non-parity version can be upgraded to parity with an etch cut, and some added wires, FWIW.) Noel

2 years, 1 month

DEC ME11-L core memory expansion unit drawings

by steven＠malikoff.com

I have finally got around to scanning the print set for the DEC ME11-L memory expansion unit and you can find it at https://archive.org/details/dec-me-11-l-core-memory-system-engineering-draw… The quality is acceptable given that the office supplies shop where I (DIY) scanned them on an A3 scanner only allowed output as JPEG or PDF (undoubtedly wrapped as JPEGs inside) so I thought there was no point degrading any more than necessary with editing the JPEGs to another format just to re-save them. I just bundled the raw scanned pages as-is and it looks fine. There's also some miscellaneous fragments for the M7050, M715 and M840 module drawings which came with the ME11 set. Steve.

2 years, 1 month

ID UV erasable PROMS used on an IBM PC board?

by organlists1＠sonic.net

I cannot find a datasheet by any of the numbers silkscreened on these ICs. Could these be proprietary IBM P/N numbers? https://www.dropbox.com/s/f6rvemx9ldbbv5x/EPROMS1.jpg?dl=0 No need for a Dropbox account, close the login pop up and you can view the image. Thanks Don Resor

2 years, 1 month

Searching cctalk archives?

by ccth6600＠gmail.com

I came across a reference to a cctalk message from 9 September 2006 and would like to read the rest of the thread with the subject "PDP-8m Console Switch Problems - fixed!". Unfortunately it appears that the cctalk archive does not go back to 2006. Is there some place with the complete cctalk archive or at least back to Sept 2006? I have also been trying to search the cctalk archive, but short of downloading every month and unzip it, there appears to be no easy way of searching. What do experienced cctalk members do? Thanks Tom Hunter

2 years, 1 month

DEC DC319A DLART (DL11 Compatible Asynchronous Receiver-Transmitter)

by pbirkel＠gmail.com

In case anyone else has been looking some of these, there is a listing for multiple tubes-of-11 on eBay at a moderate price: https://www.ebay.com/itm/123710245814 QTY-11 PCS. AMI SEMICONDUCTOR DC319 C04090 Integrated Circuit - (UIC 40378901) It's documented in the DEC Semiconductor Data Book, Volume 1 (1987), pages 3-27 through 3-41: http://bitsavers.org/pdf/dec/semiconductor/ -----

2 years, 1 month

Re: Unusual “gold” IC chips?

by bmr＠ringman.ch

Those look like "stripline" RF/microwave packages. PCBs will have cutouts for the package body, so that the leads can be soldered flat (no bends) directly onto impedance-controlled leads on the board. On Tue, Mar 22, 2022 at 6:17 PM Oldcompu via cctech <cctech at classiccmp.org> wrote: > Anybody know what these are? Maybe RF related? Found on a box of computer > ships. > > https://share.icloud.com/photos/0294pRVHPFQMShUZic2vFvneg > > >

2 years, 1 month

NEW CONTRIBUTION TO US CALL-A-COMPUTEER BIG 3 INCH 3 RING AS NEW TIMESHARE MANUAL

by couryhouse＠aol.com

NEW CONTRIBUTION TO US "CALL-A-COMPUTER"? PILLSBURY? TIMESHARE...? ?WHAT? SYSTEM WAS? THIS? RUN ON ?? ? ?IT IS A? BIG 3 INCH 3 RING AS NEW TIMESHARE MANUAL.? THANKS? ED#? ? SMECC MUSEUM

2 years, 1 month

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