test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jnc＠mercury.lcs.mit.edu

> On a whim, I tried searching for '"pdp-11" "pdp-11"' (i.e. just > repeated the keyword), and this time it _did_ turn it up! Very odd. > I wonder why that made a difference? So I have a new theory about this. Searching for 'pdp-11' causes eBay to automagically limit the search to the 'Vintage Computing' category. They must have a keyword->category database. Anyway, if I manually then select 'All' categories, I get the same results for searches for both 'pdp-11' and 'pdp-11 pdp-11'. So my theory is that 'pdp-11 pdp-11' _doesn't_ hit their database, and so it goes to 'All' - thereby producing different results. So I just have to hit 'All' every time I do a search... Noel

7 years, 8 months

BA11-C and BA11-E mounting boxes

by jnc＠mercury.lcs.mit.edu

For some actual content about classic computers (instead of flaming about various ideas for improving existing systems), I think I've worked out why the BA11-C and BA11-E mounting boxes have out of sequence variant codes. It's obvious the variants were not assigned in creation order (the /44 and /24 use the -A variant box), but the -C and -E (the earliest variants, it seems) apparently come from the fact that the first is used to hold the CPU and console (for the /20), and the latter is an Expansion box. And speaking of the -C/-E, somewhat to my surprise, I've discovered that their H720 Power Supply is actually a switching supply. Ironically, its manual gives a _far_ better explanation of the EI conversion concept than the later H742 one (which we discussed here at some length, after it confused me no end). Speak of BA11 variants, I've seen mention a BA11-B on Web sites, but only a single ref in a DEC manual (the DH11 Maint Man); does anyone have a pointer to a location where it's dicussed at more length? If so, thanks! Noel

7 years, 8 months

Re: 34 pin Card Edge “Male to Male” Connector

by w9gb＠icloud.com

Card Edge Connectors are PC Board to Wire Connectors. The 34-pin version was popular for control board on 5-1/4? floppy drives in 1980s. https://en.m.wikipedia.org/wiki/Edge_connector I have not seen commercial PC board widgets used as an interconnect. gb == Date: Tue, 27 Nov 2018 14:56:18 -0500 From: "William Sudbrink" <wh.sudbrink at verizon.net> To: cctalk Subject: 34 pin card edge male to male biscuit (wafer? adapter?) Hi, Before I go to the bother of making up a gerber, and putting in a cheap Chinese PCB order, does anyone know of any place that has them for sale?

7 years, 8 months

Zapata Tormenta ISA card

by kylevowen＠gmail.com

Does anyone have a Zapata Tormenta card that they'd be willing to sell? Thanks, Kyle

7 years, 8 months

Chaosnet for SIMH

by lars＠nocrew.org

Hello, I have added a Unibus CH11 Chaosnet interface to SIMH. I have tested it with 4.1BSD running on the vax780 simulator, and MINITS running on the pdp11 simulator.

7 years, 8 months

Text encoding Babel. Was Re: George Keremedjiev (off-list)

by cctalk＠gtaylor.tnetconsulting.net

Hi Bob, On 11/28/2018 11:30 AM, Robert Feldman wrote: > FYI, your symbols do not make it through to the list digest -- they just > come through as question marks, the same as Ed Sharp's extra spaces. Thank you for letting me know. Here's a screen shot from the copy I received from the mailing list: Link - grant-symbols - https://dotfiles.tnetconsulting.net/images/grant-symbols.png I know that they did come through the normal non-digest messages from the mailing list. Would you mind forwarding me a copy (directly) of the raw digest? I'm curious what happened to them and I don't currently subscribe to the digested feed. Depending on what I see, I may bring the issue up on the Mailman mailing list. -- Grant. . . . unix || die

7 years, 8 months

NVRAM resuscitation (Was Re: SPARCstation 20 with SCSI2SD)

by technoid6502＠gmail.com

When I bought that Sparcstation 4/330 at Computer Parts Barn, the 48T02 was one of the problems with it. The chip looks like a piggieback rom encapsulated in epoxy. I was not reinventing the wheel at the time, I think, because it was the year 2000 or so, but I looked for a replacement and found them hard to come by. So, knowing the battery was most likely the fault, I went about fixing that bit. The battery accounts for the high profile. You do not have to cut the entire doggone batter off, the terminals are at one side, iirc, the right-hand side if the notch is to your left. It is high on the epoxy, so all you need do is cut down an eighth of an inch in that region, just shave that top edge until you expose the battery terminals. I forget how I determined the polarity of them, perhaps I plugged it into the board after and tested the terminals for power, but all you do once you've exposed the terminals is solder a power and a ground wire to them and attach a 3volt battery. I used a pack with two AA's, in a case so they are user-replaceable. They are probably STILL keeping time in that machine, wherever DHS took it and my MEGA ST4 and DG MV4000/dc... That's another story. So refurbishing these chips is a cakewalk, takes 15 minutes (the second time 'round), and will work til' doomsday. Best regards, Jeff

7 years, 8 months

cctalk/cctech

by jnc＠mercury.lcs.mit.edu

I thought cctalk was supposed to be a complete superset of cctech, but looking at the cctech archives, I see a lot of posts that didn't make it to cctalk. Does one need to do both to see everything? Noel

7 years, 8 months

FixMeStick

by epmajden＠shaw.ca

Hello group: Has anyone used a FixMeStick to fix computer issues like virus problems and key tracking hacking? Does it really fix such problems or create new ones? Thanx for any comments that are posted. Ed

7 years, 8 months

34 pin card edge male to male biscut (wafer? adapter?)

by wh.sudbrink＠verizon.net

Hi, Before I go to the bother of making up a gerber, and putting in a cheap Chinese PCB order, does anyone know of any place that has them for sale? I bought a stack of them for about a buck a piece, a number of years ago, but I can't seem to find them for sale anymore. They are very useful when you want to preserve the original cables on machines where the CPU and drive chassis are "permanently" joined but you want the ease of being able to separate them. Ohio Scientific machines are a good example of this. They are also useful to provide test points in the CPU to drive signals. Over the years, I've lost a few and given a few away and now I need some more. Thanks, Bill S. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

7 years, 8 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb