test-drb February 2009

test-drb@ccmp.vtda.org

196 participants
309 discussions

by lynchaj＠yahoo.com

Hi! Is there any sort of a standard for S-100 backplane spacing? I measured a couple of backplanes I have (a VG and another one) and they both measured .375" (3/8") gap between the connectors. That seems rather closely spaced to me if the boards are 3/4" apart if the connectors are 3/8" wide themselves. What would be the minimum useful gap between S-100 connectors for a small hobbyist S-100 backplane? I presume 3/8" gap is not enough if you want to accept prototype boards with wire wrap sockets and maintain some clearance. Any constructive thoughts on the subject much appreciated. Thanks and have a nice day! Andrew Lynch

15 years, 5 months

S-100 backplane board spacing

by lynchaj＠yahoo.com

S-100 backplane board spacing Al Kossow aek <mailto:cctalk%40classiccmp.org?Subject=S-100%20backplane%20board%20spacing& In-Reply-To=> at bitsavers.org Fri Feb 6 09:13:35 CST 2009 * Previous message: S-100 backplane board spacing <http://classiccmp.org/pipermail/cctalk/2009-February/268634.html> * Next message: Some Microtek MICE documentation <http://classiccmp.org/pipermail/cctalk/2009-February/268620.html> * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2009-February/date.html#268616> [ thread ] <http://classiccmp.org/pipermail/cctalk/2009-February/thread.html#268616> [ <http://classiccmp.org/pipermail/cctalk/2009-February/subject.html#268616> subject ] [ author ] <http://classiccmp.org/pipermail/cctalk/2009-February/author.html#268616> _____ > does anybody have a handle on where I > could obtain 5 S100 edge connector sockets? You also need to specify the spacing of the circuit and component side pins on the connector for your backplane. There are at least two different spacings that were used. Most were the wider style, early MITS backplanes had closer spacing. _____ * Previous message: S-100 backplane board spacing <http://classiccmp.org/pipermail/cctalk/2009-February/268634.html> * Next message: Some Microtek MICE documentation <http://classiccmp.org/pipermail/cctalk/2009-February/268620.html> * Messages sorted by: [ date ] <http://classiccmp.org/pipermail/cctalk/2009-February/date.html#268616> [ thread ] <http://classiccmp.org/pipermail/cctalk/2009-February/thread.html#268616> [ <http://classiccmp.org/pipermail/cctalk/2009-February/subject.html#268616> subject ] [ author ] <http://classiccmp.org/pipermail/cctalk/2009-February/author.html#268616> _____ More information <http://www.classiccmp.org/mailman/listinfo/cctalk> about the cctalk mailing list _____ -----REPLY----- Hi! Thanks Al! My question is really what are the commonly accepted standards for appearance, casing, etc. I agree there seem to be an early "narrow" width and a later "wide" width between S-100 connectors. Is there a standard or commonly accepted practice for center to center "wide" board spacing or is it arbitrary? My intent is for a small (4 slot) motherboard used for hobbyist prototyping not a full blown system. The primary application would be the development of new peripherals using prototype boards. I expect that the use of wire-wrap sockets would be common requiring some clearance on the copper side and that the ICs and passives would be socketed. My estimates are that wire-wrap sockets need just bit over 1/2" clearance on the copper side and that most socketed ICs/passives require 1/2" clearance on the component side. Allison's estimate of 1" centers for the boards seems like a reasonable compromise. It won't get every possible combination but enough to be useful. The purpose is to allow low cost prototyping not for a full blown long term system installation. Cost is of primary importance which translates to little PCB surface area as possible while still being useful. BTW, Digikey carries a couple of types of S-100 compatible connectors but they are not cheap. Sullins and EDAC 0.125" spaced, 50 position, 2 row, 100 pin, PCB through hole solder tails card edge connectors run from about $8 to $12 a piece. I can get them surplus occasionally. eBay sells them too but are the wire-wrap variety which would work but is a gross abuse of a wire-wrap connector to solder it into a PCB. It can be done but I wouldn't tell anyone about it. :-) Thanks and have a nice day! Andrew Lynch

15 years, 5 months

Atari ST floppy drive?

by dbetz＠xlisper.com

I'm trying to recover some files off of a couple of Atari SH204 hard drives but I only have a 520ST and need to find an external floppy drive to bootstrap my system. Does anyone have a spare Atari SF314 floppy drive around that they'd be willing to part with? I don't have much classic stuff left so I guess this will have to be a sale rather than a trade. Thanks, David

15 years, 5 months

Microdata 6000 and Printronix P-600 printer in Edison, NJ

by wmaddox＠pacbell.net

There is a Microdata 6000 and a Printronix P-600 printer in Edison listed on eBay. He's also listed a Cipher tape drive, which is installed in the Microdata. The seller seems to want to get rid of these in very short order, and wants the stuff picked up tomorrow for an auction closing today. There are no bids, and I doubt he's going to get any. Anyone near Edison want to pick this stuff up for a steal? I have fond memories of the Printronix at CMU in the 80's, and hate to think he'll scrap it. --Bill Ebay Item #s 300291062623 300291065881 300291064691 http://cgi.ebay.com/Used-Microdata-6000-System-with-Cipher-Hi-Density-tape_… http://cgi.ebay.com/Used-9900-Cipher-Hi-Density-tape-DRIVE-REEL-TO-REEL_W0Q… http://cgi.ebay.com/Used-Printronix-P-600-600-LPM-Printer-Genicom-Tally_W0Q…

15 years, 5 months

speaking of 3.5

by melamy＠earthlink.net

I been "listening" to most of this thread so, forgive me if I already mention an idea that someone has already brought up... I seem to recollect that when I was working on hard sector floppy drives back in the Northstar Horizon system days, that the controller only wrote a block of data for each sector with basically nothing in between. It saw an index hole, wrote the block and then waited for the next index hole to write the next sector. If you want to recreate index holes for reading a hard sectored floppy, it seems you could detect the end of data from the previous sector and then generate a accurate index hole for the upcoming sector. Use the single index to reset the sector count if you are keeping track of that. Obviously, this is only a solution for reading the disk best regards, Steve Thatcher > >Hi Chris > I was recently looking at my Teac drive's index pulse to see how it >worked relative to the drive going ready ( the problem of trying to >find a way to recreate the /Ready signal ). > One thing I noticed was that the leading edge of the index pulse >was as accurate as my scope could show but the trailing edge was >all over the place. > My thinking is that the drive is controlled by a servo loop. >The leading edge is when a crystal clock says the pulse is suppose >to start and the trailing edge is when the actual edge is detected. >If one timed the length of time between the two edges, one would >then know the corrective response of the loop. > As an example, if the pulse was long, you'd keep a similar software >wheel rotating that you apply a correction to by the amount the >pulse was long. > It would be this internal software generated wheel that you'd use >to create the index pulses from. > You need the code to watch the drive to determine the parameters >of the control system, gain, dampening and intertia. > If done this way, I suspect that one could get very close to >the right index pulse spacing. >Dwight > > >_________________________________________________________________ >Windows Live?: Keep your life in sync. >http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t1_allup_howitworks_022…

15 years, 5 months

FFS: CP/M Plus Guide

by silent700＠gmail.com

I've got a big pile of paper here (the binding is missing:) Digital Research CP/M Plus Version 3 OS User's Guide, Programmer's Guide and System Guide (all one book.) I'll send it out for the cost of shipping. It probably weighs a couple pounds. Preference given to someone who can scan it nicely and get it into one of the document archives out there. My sheet feeder has given up on feeding the 6"x9" paper. Or, if it already has been scanned and is out there somewhere, someone let me know. Then I won't feel bad recycling it. j -- silent700.blogspot.com Retrocomputing and collecting in the Chicago area: http://chiclassiccomp.org

15 years, 5 months

DECwriter correspondent LA12 operators manual

by pat＠computer-refuge.org

For anyone interested, I scanned a copy of the LA12's operators manual, which Tom Ponsford graciously loaned me, and have placed a copy here: http://computer-refuge.org/classiccmp/dec/la12/ Al, if you want to grab that or my TIFF copy for bitsavers, let me know and I can send it to you. It's 400dpi/1bpp and G4 compressed. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

15 years, 5 months

PDP-11 power requirements

by slawmaster＠gmail.com

I may soon be acquiring a PDP-11; I do not know the exact model. My question is, what kind of power supply might this require? It sounds like some can use 110V and others require 220? Are there models that I can just plug into my apartment's wall socket, or do I need to get an extension cord from the washer/dryer socket (which is not in use right now)? If anyone can summarize what models need what sort of power, I'd appreciate it. Thanks John -- "I've tried programming Ruby on Rails, following TechCrunch in my RSS reader, and drinking absinthe. It doesn't work. I'm going back to C, Hunter S. Thompson, and cheap whiskey." -- Ted Dziuba

15 years, 5 months

Anyone have a line on batteries for the NLS portable oscilloscope?

by ethan.dicks＠gmail.com

Hi, All, The topic of replacement batteries came up in the Yahoo Group for the RB5X, and someone posted a link for 2 volt 2.5 Amp-hour cells (which are apparently used in an older version of the robot than mine)... <http://www.batteryweb.com/hawkersla-detail.cfm?Model=0810-0004&label=single…> I saw the image and immediately thought of my NLS portable oscilloscope. I'd love to refurb mine, but $45 in batteries is a little on the high side for me. Has anyone on the list replaced a set of this sort of battery, and does anyone know of a place that stocks them for a bit less? -ethan

15 years, 5 months

Collection up date

by RodSmallwood＠mail.ediconsulting.co.uk

Hi all I had a super Xmas break and as a result The following have been restored to factory spec and are running. On TCP/IP network VAX 4000 M500 VAX 4000 M200 MicroVAX 3100 VAX Station 3100 Alpha 3000 Alpha Station 200 Stand alone Rainbow 100+ Needs a DECnet adapter 11C23 Running Micro RSX needs the DECNet board (which I do have) and the Cable which I don't. Decmate III Working Periperals VT200's VT320's VT240 Awaiting Parts/Attention PDP 8e - Has a difficult to trace hardware problem It was running but now I can't toggle in a test proigram. Set address -> DEP -> Set Data - > DEP (Increments the address ok) Go back and examine memory = nothing. System has four x 4K core memory. Removing any one or three out of four makes no difference. I'm rusty on PDP8's ( I last worked on one in 1972) Help!!!!!!!!!!!!! VAX 4000 M300 (Needs the upper outer door and the door for the front of the CPU compartment PRO 350 Needs a RD-5X MF ST506 Drive PRO 380 Needs a RD-5X MF ST506 Drive VT 103 (Needs a monitor board) PDP-11/94 (Needs KDJ11-EB = M8981-BA) Wish List DEC logo colour monitors of any type. VAX VLC's 11/05 11/10 11/34 11/70 RL01's VT100's VT102 VT4XX LA36 LA180 BA123 (Enclosure) BA23 (Enclosure) 11X94-E (Enclosure) Rod Smallwood

15 years, 5 months

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test-drb February 2009