test-drb

test-drb@ccmp.vtda.org

101090 discussions

by w9gb＠icloud.com

??Many of the classic Rocker & Lever Actuator switches from the 1960s & 1970s were discontinued, due to industry consolidation (M&A) in 1990s and the convert or obsolete decisions (RoHS compliance), a decade later. This likely means you will need to ?adopt? to current offerings == OR == plow through remaining discontinued surplus parts. For example, Mendelsons only lists about 5% of their Dayton warehouse inventory. https://meci.com/electronics/parts/switches/rocker.html == These Large Actuators are sometimes referred to as Wide Paddles. C&K refers to this PC board mounting as the V3 Style, VERTICAL MOUNT, V-BRACKET It is still offered for the C&K ?T-series? Subminiature Toggle Switches. https://www.mouser.com/datasheet/2/60/ttoggle-1324393.pdf C&K Selector Guide (current production models) http://www1.futureelectronics.com/doc/C%20-%20K%20COMPONENTS/D102J12S115DQA… NKK (Japan) refers to this mounting style as Bracket & Reinforced Bracket for their ?M-series? Miniature Rocker Switches. You purchase the Actuators separately, for the pivot ? like your example. https://www.mouser.com/datasheet/2/295/MrockersSnapin-29723.pdf gb === From: "Charles" <xxxx at centurytel.net> To: "cctalk digest" <cctalk at classiccmp.org> Subject: Looking for front panel switch At some earlier time, I'd either lost (or cannibalized for a PDP-8) one of the switches. Subminiature SPDT toggle switches are readily available >from C&K and Mountain, but I cannot find one with the four-pin mounting bracket and the "ears" to hold the paddle lever pivots. Attached is a picture showing part of the front panel. https://imgur.com/bIrmZt7 Does anyone have a matching switch they're not using? I have a spare black lever, but it's supposed to be blue for that nibble which would be even better ;) Thanks for any help. ==

6 years, 8 months

Looking for front panel switch

by charlesmorris800＠centurytel.net

> https://www.tedss.com/MT-SPDT-7101 Thanks :) It's only slightly different (the mounting pins look to be a bit closer together than my switches dated 1975, but I can drill a couple holes in the PC board, and swap my matching lever onto it.) Certainly a lot closer than the totally non-matching chrome bat handle unit I stuck in there for now! -Charles -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

Vintage Computer Warehouse Liquidation

by tsraguso＠gmail.com

This is my first of many posts that I will make about this sale. I am liquidating a large warehouse filled with vintage computers including Apple, DEC, IBM, Commodore, Tandy/Radio Shack, HP, and more. Many items are currently inaccessible due to large piles of junk and video games. So far, I have found: Apple Lisa 2 Tandy 6000 HD IBM 5251 Keyboard MicroVAX 3900 (currently inaccessible) MicroVAX II (currently inaccessible) Cromemco System One Ohio Scientific Challenger 2p Lots of Apple II series IBM 5110 Piles of VT100s Even more VT220, VT320 Northstar Advantage Osborne 1 Various Kaypros PC clones Commodore B-Series Just about every kind of TRS-80 IBM XT with monitor in box NeXT cube Almost every type of Macintosh Amigas IBM PS/2 P70 HP 3000 (inaccessible) 1970s HP computers Boxes filled with Cromemco and Northstar manuals A pallet of 1980s PC clones (inaccessible) Heaps of CRT monitors Mechanical Keyboards At least 20 Apple Extended Keyboard II's I have barely scratched the surface of the warehouse, and will keep you updated when I find more items, or am able to move the large systems. The DEC terminals are not yet for sale, since I have not yet found the keyboards. I am not taking offers on the entire warehouse at this time. Please feel free to text me with questions Thomas Raguso (832) 374-2803

6 years, 8 months

Mystery chip SCM44506L

by wrm＠dW.co.za

Hi all From a friend's estate I have a Motorola 24-pin 0.6" purple ceramic DIP. SCM44506L 7610 B Any idea what this can be? W

6 years, 8 months

Able document at VCF Midwest

by jnc＠mercury.lcs.mit.edu

> From: Christian Corti >> we only have those for the UNIVERTER and QNIVERTER > And what about the stuff on bitsavers? That's where I got my copies of the UNIVERTER and QNIVERTER docs. I guess I missed grabbing a few; and I see a few more have been added since I last looked: http://www.bitsavers.org/pdf/able/ So we also have the Quadrasync, DH/DM, MICROVERTER and UNIMAP. There are still quite a few missing, though... Noel

6 years, 8 months

Looking for front panel switch

by charlesmorris800＠centurytel.net

This fall I decided to restore my first homebrewed computer that I made 40(!) years ago and still have... a 2 MHz 8080A, 1K of static RAM, a 1702A (256 byte) EPROM, cobbled up an S-100 connector for a VB-1B video card, an 8-bit I/O port that used an EBCDIC keyboard (ASCII translation table in the EPROM), and of course a hand-made front panel PC board with blinkenlights & switches. I had a good time learning assembly language (and hand-assembling)... I also toggled in WADUZITDO once or twice. That's a functional interpreted language in 256 bytes plus char in/out routine, for the youngsters ;) I sold the VB-1B years ago, and can't find the keyboard which got lost in a move years ago. So if I want to play with small 8080 programs, I'll need to add a UART (and redo the primitive monitor program for serial I/O instead of memory-mapped display). Recently I bought one of Martin Eberhard's ME-1702A boards with pre-programmed PIC, acquired all the parts from junkbox and Mouser, and just got THAT working. Surprisingly enough, the monitor seems to still have all the right bits after 40 years. Anyway. At some earlier time, I'd either lost (or cannibalized for a PDP-8) one of the switches. Subminiature SPDT toggle switches are readily available >from C&K and Mountain, but I cannot find one with the four-pin mounting bracket and the "ears" to hold the paddle lever pivots. Attached is a picture showing part of the front panel. https://imgur.com/bIrmZt7 Does anyone have a matching switch they're not using? I have a spare black lever, but it's supposed to be blue for that nibble which would be even better ;) Thanks for any help. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

LISP implementations on small machines

by jnc＠mercury.lcs.mit.edu

> From: Eric Smith > Code can be executed from the MMU PAR registers on processors with > 22-bit addressing (11/23, 11/24, 11/44, 11/70, and J-11 based systems). My QBUS machine is apart at the moment, so I can't verify this before posting, but I don't think this hack works on the J-11 machines; I documented this behaviour here: http://gunkies.org/wiki/KDJ11_CPUs#Code_in_PARs It does work with F-11 processors (/23, etc). Not sure about model A F-11's, which only have 18-bit QBUS addressing. Noel

6 years, 8 months

[OT] Looking for a CHEAP Metcal WS1 workstand

by alexandre.tabajara＠gmail.com

Subject says all =) ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<---

6 years, 8 months

Off topic- precision tooling

by useddec＠gmail.com

I have a sizable quantity or tooling for sale or trade including : circular blades, mostly Levin, 1 1/4 d, 1/4 arbor from .008 to 03 and probably others. drill bits- Levin. 13mm, .0028" etc.and 15 tubes only some labeled, B & D, Cleveland decimal sets, Precision twist and other companies sizes 60 through over 100 or so.. Morris taps and dies, 0-80 through 0000-160, about 20 sizes. Most are new, but a few might be used. If you have any interest, contact me off list. If there enough interest I'll try to make a detailed list. They are a pain for me to work with, but cheap to ship. I also have larger size taps, die , and bits up to 1 1/2 or so, I think a #3 or #4 Morse taper Thanks, Paul

6 years, 8 months

LISP implementations on small machines

by mark.kahrs＠gmail.com

The first implementation was done for the 7090 by McCarthy (hence CAR and CDR --- Contents of Address Register and Contents of Decrement Register). If you want to see a tiny implementation then look for the PDP-1 implementation done by L Peter Deutsch. There's a book chapter and then I found this report: http://s3data.computerhistory.org/pdp-1/DEC.pdp_1.1964.102650371.pdf

6 years, 8 months

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