test-drb December 2018

test-drb@ccmp.vtda.org

174 participants
203 discussions

by rodsmallwood52＠btinternet.com

Sheesh!! Well what a response. This stems from my (so far) successful major over haul of my PDP-8/e. I found one failed 7474 and one failed 8881 ? replaced and now working. I think I have the rim loader toggled in and will attempt to send a paper tape image from Hyperterm Strangely I do have at least three genuine complete 4k memory sets. The eightstoration will continue. However I began to think would it be possible to create a close copy of an ?8/e out of ?modern parts. As you all know I make front panels so that?s not a problem. I did manage to copy my (distorted) bezel in resin. A friend has been able to 3D print toggle switch leavers that fit and work. Vince Sylngstat has done a console board PCB ?layout. Power supply clearly not a problem. So what?s left? Case? ? Well I have one of those and I suspect a sheet metal shop would not have a problem Finally the big one ? Omnibus and the connectors its made from. A 3D printing candidate? I?m going to autopsy a busted connector and see how they are constructed inside. Objectives The basic board set as original. M8300, M8310, M8320 etc. Same form factor Plug compatible ? but board contents can differ from original The idea is replace one item at time until you no longer have any DEC parts. Yup a FAKE-8 I may even need a label ?No part in this PDP-8/e computer was manufactured by digital equipment corporation? Rod Smallwood digital equipment corporation 1975-1985 Sent from Mail for Windows 10

6 years

Christmas came early...

by wh.sudbrink＠verizon.net

In the form of an estate sale. The first in a long while where I found anything interesting. In addition to buying a large box of 7400 and 4000 series chips, all with 1970's date codes, I got two vintage keyboards: http://wsudbrink.dyndns.org:8080/images/kb_pics/20181215_162104.jpg http://wsudbrink.dyndns.org:8080/images/kb_pics/20181215_162139.jpg The estate sale employees have no idea where the associated systems (if any) are. They did not see them during the sale preparation and have not sold them. I also got a manual and set of 8 inch floppies for "Unicorn Systems Software Tools For CP/M". Twenty floppies, all with factory labels, various libraries, utilities and documentation files. I have not made a careful study of them yet (I just got home with them an hour ago). Bill S. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years

Looking for a home for most issues of BYTE Magazine

by john＠ziaspace.com

Thank you all for all of the interest. The first person who wrote me isn't far away at all and will give it a good home, so I'm going to go with him. While I'm fetching those, I'm going to make a list of other older hardware for which I'd like to find homes, so I'll post about that, and possibly about other magazines, in a week or so. Thanks! John

6 years

Data Electronics Incorporated (DEI) CMTD-300S2 tape drive manual

by microtechdart＠gmail.com

For view or download: http://bit.ly/2RZK28Q I came across this, and noticed that this early of a DEI model was not yet archived at http://bitsavers.org/pdf/dei I'm not sure that it is scanned to the requirements of bitsavers, but I don't have access to the original, so I offer this if it is usable or of interest to anyone here. I'll probably also post it on one of my sites, at http://QICreader.com I also just acquired this DEI 301034-2 QIC Tape Drive, and have begun to reverse-engineer it. https://ebay.to/2EjyxFn Best always, -- Thanks, AJ

6 years

Looking for a home for most issues of BYTE Magazine

by john＠ziaspace.com

Hi, all, I have a collection of most of BYTE Magazine from the beginning through about 1985. Instead of selling it on eBay, I'd rather find a home for it where people can enjoy it. I also have a small collection of other computer magazines from the late 1970s and early 1980s which I'd like to include. Does anyone know of any person or organization within a reasonable distance from southern California who might take these magazines and preserve them, instead of just selling them on eBay? Thanks! John -- I don't know which scares me more - that people adhere to the idea of an omnipotent being powerful enough to create the universe, but whose supposedly most cherished creation is a race modeled after himself which can't stop hurting and killing each other, or the idea that those same people cannot or will not consider the possibility that the universe is random and unfeeling, and it's up to us to create order and beauty out of chaos and entropy.

6 years

Core memory emulator using non volatile ram.

by elson＠pico-systems.com

On 12/15/2018 03:22 AM, Rod G8DGR via cctalk wrote: > I have an idea to produce an MM-8 clone using RAM that acts like core when turned off. > Can anybody suggest a chip that will do this? > > Any CMOS SRAM chips can do this, with a backup battery. I used a IS62WV6416DBLL in a project a while ago. I did not use in in battery-backed mode, but it could do that. You do have to make sure that any outputs from the memory are driven to the high-impedance state during power-off to prevent draining the battery. Jon

6 years

Core memory emulator using non volatile ram.

by bobalan＠sbcglobal.net

On 12/15/2018 1:22 AM, Rod G8DGR via cctalk wrote: > I have an idea to produce an MM-8 clone using RAM that acts like core when turned off. > Can anybody suggest a chip that will do this? > > Rod Smallwood > > > Sent from Mail for Windows 10 > > I used Everspin MRAM chips for my PDP-8e memory cards. It's just like SRAM, fast at 35 ns, and unlimited read/write endurance. Only drawback is it's 3.3 volts only. I just used level converters. It's a magnetoresistive memory, feels just like core. $12 for a 64K x 16 chip at Digikey. Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org

6 years

Core memory emulator using non volatile ram.

by pbirkel＠gmail.com

Perhaps Cypress FM1808 (32Kx8). Obsolete, but available on eBay. SOP for a bit of extra challenge! -----Original Message----- From: cctech [mailto:cctech-bounces at classiccmp.org] On Behalf Of Rod G8DGR via cctech Sent: Saturday, December 15, 2018 4:22 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Core memory emulator using non volatile ram. I have an idea to produce an MM-8 clone using RAM that acts like core when turned off. Can anybody suggest a chip that will do this? Rod Smallwood Sent from Mail for Windows 10

6 years

Core memory emulator using non volatile ram.

by rodsmallwood52＠btinternet.com

I have an idea to produce an MM-8 clone using RAM that acts like core when turned off. Can anybody suggest a chip that will do this? Rod Smallwood Sent from Mail for Windows 10

6 years

Documation card readers for sale

by ball.of.john＠gmail.com

About six months ago I struck a deal with a place down in California for four Documation M1000's that I've been able to tell so far they all work but I really don't have space for more than one. I've been trying to sell them at a loss for months now over on the Vintage Computer Forums and Nekochan (if you got here you'll find pictures) but no bites. I swear there were people out there that were looking. Where did you folks go? Might anyone here be interested? I absolutely refuse to put them on the curb. -John

6 years

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test-drb December 2018