- test-drb@ccmp.vtda.org - classiccmp.org

by binarydinosaurs＠gmail.com

Hi folks, For the last few weeks I?ve been helping the owner of a PPG2.2 synthesizer get the ?computer? side of it, a Waveterm A, running. The Waveterm is a 6809-based single board computer running FLEX that was designed to use 8? drives, then at some point they modified it slightly to use 5.25? HD drives instead but changed very little - to connect up to the main board they made a 34-50pin adapter. The drives are YE-Data YD380 with a Shugart interface so without some sort of signal bender like a DBit FDADAP I couldn?t just plug them into a PC. However, the YE-Data YD380B has an IBM interface so we used one of those, same mechanism so we figured it should work. All the disk images for the Waveterm have been created using programs written by PPG users. For some reason any disk we wrote with them wouldn?t read correctly in the machine itself UNTIL we made a new image of that disk using Teledisk 2.15 then re-wrote it back to the same floppy. My question is why should that make so much of a difference between working and non-working disks? Trivia: for anyone aware of the 80s UK Music industry this very machine was used for the hit ?You spin me round (like a record)? by Dead Or Alive. -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk

7 years, 10 months

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Weird Lear-Siegler ADM-3A board

by binarydinosaurs＠gmail.com

Hi folks, A friend of mine has said ADM-3A and is baffled by the tiny board it contains, not the usual ?covering entire base? discrete logic board they normally have. Centre of this board is the Nat Semi NS405 ?display processor on a chip? which is obviously why the board is so small but neither of us have seen this before in a 3A. Anyone else? Pic at http://www.binarydinosaurs.co.uk/tonyADM3a.jpg <http://www.binarydinosaurs.co.uk/tonyADM3a.jpg> cheers! -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk

7 years, 10 months

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eBay: HP 21MX E-Series Minicomputer 2109B

by jnc＠mercury.lcs.mit.edu

Figure you HP fans will already have seen this, but in case not: https://www.ebay.com/itm/332695779697 Noel

7 years, 10 months

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IBM junk

by cctalk＠ibmjunkman.com

4th sentence. Praise the computer gods I found someone that wanted it all.

7 years, 10 months

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IBM junk

by cctalk＠ibmjunkman.com

I believe the 1130 used the 2315

7 years, 10 months

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IBM junk

by cctalk＠emailtoilet.com

Well, not really. CHM only wants my punched card collection (4000+ cards) which they are getting when I croak. Did not want the other stuff. Livingcomputers only interested in miniatures. I will swear I sent a note to Al Kossow about manuals. No reply.

7 years, 10 months

1
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DEC Mouse replacement

by dj.taylor4＠comcast.net

I would like to have a couple more DEC Mice for some Vaxestations I have, but they seem to be pretty rare.? At present I only have one mouse and I move it from machine to machine. The protocols for the DEC mice and the standard PS/2 mice don't seem to be that much different. Is it possible to use an arduino to translate? PS/2 mouse output and then send it to the vaxstation so that will it mimic a classic DEC mouse?

7 years, 10 months

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More tapes - This time all Tektronix 405x series

by mmcgraw74＠gmail.com

I was successfull at capturing all the files from a 4051 Graphics T1 tape last weekend. Here is the link to a couple of photos of the process: Capturing Tektronix 4051 Graphics T1 tape files to laptop <https://drive.google.com/open?id=18hROXB28PD9Z_GYDNNSXGPK4Pv7GQD8w> First I replaced the disintegrated drive belt with one from a NOS 3M DC6250 cartridge. I used my 4051 to PC serial transfer program on my recently repaired and upgraded 4054A. I set the comm speed of the 4054 serial interface to the maximum 9600 baud, but as it is 7-bit, my program changes all 32 Tektronix control characters to "~X~" where X is the ASCII character corresponding to that control character. This way I don't lose any of the Tektronix 405x text formatting in the transfer. I was using ExtraPutty on the laptop to capture the program text strings, then copied the statements into Notepad++ and saved each file. I am also working on a Tektronix 4051/52/54 compatible GPIB MicroSD flash drive that will emulate the Tektronix 4924 tape drive - for all of us with these computers to use - since both the tapes and drives are very problematic after all these years. This flash drive contains an Arduino with my code - based on the GPIB flowcharts and info in a 4051 and 4052 GPIB manual. You will be able to use the existing 405x program statements with @Y for the drive GPIB address - since I don't know how to write a ROMPACK for any of the series :) I plan to organize the different captured tapes in directories on the flash - and that may mean using a non-4924 GPIB secondary address for that command. It also likely means I need to change any tape commands in each program to use the flash drive GPIB address. That's why I wanted to capture one of the Tektronix tapes with a menu - is to ensure I could get those files to work on my flash drive design. Monty McGraw

7 years, 10 months

4
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New Listings for Sellam's VWoCW - June 20, 2018

by sellam.ismail＠gmail.com

Hello Folks, More stuff! New listings for June 20, 2018 Beck-Tech C64 ROM Emulator 80486 Multi-Master Card H214 8Kx16 Planar Core Memory M7504 DEQNA Ethernet Controller VS40X 4 Plane Color Option Bit Boffer BB-1 Ricoh V20 MMI Development PCB EXT 01 slot extender board Diablo Systems RGEXT slot extender board Mystery Memory Board Lexar 48K Memory Expansion Board National Semiconductor COP402N Processor I/O Board National Semiconductor COP402N Processor I/O Board National Semiconductor 8080 Processor Board Set Quantum Q2030 hard drive logic board Anderson Jacobson ADAC 1200 Acoustically Coupled Modem IEV Corp. VIP-2000 InfoChip Systems 13-000025 Compression Coprocessor Board International TeleText Communications PC TeleText Decoder Generic Network Card Gould K-20 Logic Analyzer Tektronix C-5A Oscilloscope Camera List with links to individual items is here: https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_HJ5oMKuab4zrApI_hi… (Please note: the links get screwy as I add/delete items because they are not anchored to the actual item but to the cell range, still trying to work on a fix for this. If you link to an item and it's just not there it means it has sold.) Instructions, FAQ, everything is at the link above. E-mail directly for any questions. Thanks! Sellam

7 years, 10 months

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New Listings for Sellam's Collection Sales

by sellam.ismail＠gmail.com

Hi Folks. I've reorganized my sales listings into a Google Sheets set. The introductory page is here: https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_HJ5oMKuab4zrApI_hi… Use the tabs on the bottom of the sheet to navigate to the various "rooms". New items have been added and are listed here: https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_HJ5oMKuab4zrApI_hi… New items are always added to the New Arrivals Niche, so that's the first place you should check when you visit my virtual online warehouse. I will post a message to this list and the VCFed forums whenever new items are listed, which will occur more regularly. As always, please inquire directly to me via e-mail for the fastest response. Thanks! Sellam

7 years, 10 months

8
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More tapes - This time all Tektronix 405x series

by mmcgraw74＠gmail.com

I was successfull at capturing all the files from a Tektronix 4051 Graphics T1 tape last weekend. Here is the link to a couple of photos of the process: Capturing Tektronix 4051 Graphics T1 tape files to laptop <https://drive.google.com/open?id=18hROXB28PD9Z_GYDNNSXGPK4Pv7GQD8w> First I replaced the disintegrated drive belt with one from a NOS 3M DC6250 cartridge. I used my 4051 to PC serial transfer program on my recently repaired and upgraded 4054A. I set the comm speed of the 4054 serial interface to the maximum 9600 baud, but as it is 7-bit, my program changes all 32 Tektronix control characters to "~X~" where X is the ASCII character corresponding to that control character. This way I don't lose any of the Tektronix 405x text formatting in the transfer. I was using ExtraPutty on the laptop to capture the program text strings, then copied the statements into Notepad++ and saved each file. I am also working on a Tektronix 4051/52/54 compatible GPIB MicroSD flash drive that will emulate the Tektronix 4924 tape drive - for all of us with these computers to use - since both the tapes and drives are very problematic after all these years. This flash drive contains an Arduino with my code - based on the GPIB flowcharts and info in a 4051 and 4052 GPIB manual. You will be able to use the existing 405x program statements with @Y for the drive GPIB address - since I don't know how to write a ROMPACK for any of the series :) I plan to organize the different captured tapes in directories on the flash - and that may mean using a non-4924 GPIB secondary address for that command. It also likely means I need to change any tape commands in each program to use the flash drive GPIB address. That's why I wanted to capture one of the Tektronix tapes with a menu - is to ensure I could get those files to work on my flash drive design. Monty McGraw

7 years, 10 months

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Tektronix terminals, Tekxpress v8?

by carlojpisani＠gmail.com

hi I have a Tek XP400, and a Tek XP217. They are X11-terminals made in 1990s (thus unable to support GTK-v2) anyway, the XP217 runs with TekXpress v7, I have a copy for my tftp-boot server and the terminal is happy with it; whereas the XP400 says it needs a more recent software. does anyone happen to have TekXpress v8, or NCD bridge v4? let me know Thanks

7 years, 10 months

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Website Relocation

by cube1＠charter.net

FYI, the service under which I have been hosting my website for many, many years is going away. So, webpages.charter.net/thecomputercollection Has been relocated to www.computercollection.net (The content is unchanged for now). This will also give me the freedom to eventually post lots more (and muc better) photos, put up my manual database and other databases at some point, and all sorts of cool things over time, but at present I am focused on my capture of the IBM 1410 Automated Logic Diagrams (ALDs). (BTW, the capture application (C#) is written, though still being debugged/improved, and I have already captured one volume of drawings, and am testing VHDL generation from the captured information.) JRJ

7 years, 10 months

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DECServer 200/DL board?

by aek＠bitsavers.org

Is this a 200/DL (RS423 data lines only) board? https://www.ebay.com/itm/352381870034 A normal 200 would have two large IDC connectors on the pcb for serial I/O

7 years, 10 months

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DEC VT 420 comm cable?

by w2hx＠w2hx.com

Hi friends, I just received a refurb'd VT-420 with green screen. I see that I need a special 6 pin/modular-type cable for the comm port. I located the adapter to get to DB25 ( https://www.ebay.com/itm/262041938994 ) but I need the interconnecting cable. Anyone know what it is called? Anyone have one for sale? 73 Eugene W2HX

7 years, 10 months

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Assessing Plastibands for QIC Tension Band Replacement

by microtechdart＠gmail.com

If anyone is interested, I just published a few videos showing my testing of PlastiBands for QIC Tape Cartridge replacement. https://youtu.be/irOrR-ZYwjw and https://youtu.be/GVsYHLvCvZY A special thank you to CuriousMarc, Al Kossow, and Chuck(G) for their help, leadership and inspiration in this area! And my page dedicated to QIC Tension Bands... http://qicreader.blogspot.com/p/drive-belts.html As always, I welcome feedback, and hope this is of value to some here. Best always, -AJ -- Thanks, AJ Palmgren http://QICreader.com

7 years, 10 months

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Did anyone on the list get these tapes?

by aek＠bitsavers.org

https://www.ebay.com/itm/1372243559202 basic.p11 syslod.p11 rdt.p11 all from mid 1971 original RSTS? hope the person who got these knows what they bought

7 years, 10 months

7
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Lots of old DEC stuff

by sales＠elecplus.com

This guy is an eBay seller. I think he is a recycler. He has over 185,000 DEC items listed! Not affiliated with seller, etc. https://www.ebay.com/sch/m.html? <https://www.ebay.com/sch/m.html?&_nkw=DEC&_sacat=0> &_nkw=DEC&_sacat=0 Cindy Croxton --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

7 years, 10 months

6
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HP 7980 tape drives

by sieler＠allegro.com

Hi, Anyone interested in three HP 7980 tape drives (9-track, 1600/6250 BPI, IIRC). One HP-IB interface, two SCSI interfaces. Rack mountable. Most likely local pickup only, in Redwood City. thanks, Stan

7 years, 10 months

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68020 adapter

by carlojpisani＠gmail.com

hi guys I need something like this (1) anyone know where can I get one? (1) https://literature.cdn.keysight.com/litweb/pdf/64748-90901.pdf

7 years, 10 months

2
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New Listings Added to Sellam's Virtual Warehouse of Computing Wonders

by sellam.ismail＠gmail.com

New items added for June 15, 2018: Panasonic FT-70 Executive Partner Radio Shack TRS-80 Color Computer Mini Disk Atari 850 Interface Module Atari 1010 Program Recorder Rana Systems 1000 Floppy Disk Drive Axiom ParallAx CD Printer Interface Apricorn external parallel port interface Personal System/2 and Personal Computer BIOS Interface Technical Reference NETBIOS Application Development Guide IBM Technical Directory Cromemco Z2D Computer System Hayes Micromodem 100 DEC RX50AA IBM Type 4869 External 5.25" Disk Drive Byte-Back MD-1 Modem Kit Radio Shack TRS-80 Modem I Tandy Serial Mouse (boxed) Connecticut microComputer Inc. ADA 1450 PET Printer Interface Control Data Disk Drive Tester/Formatter Cromemco Z2D case/power supply/backplane COMPAL-80 case/power supply/backplane List with links to individual items is here: https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_HJ5oMKuab4zrApI_hi… Instructions, FAQs, everything is at the link above. E-mail directly for any questions. Thanks! Sellam

7 years, 10 months

2
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Modifying microcode

by kylevowen＠gmail.com

Has anyone attempted to reassemble and update the microcode on a MicroVAX? Seems like there's enough stuff here to possibly do it: http://simh.trailing-edge.com/semi/ucode/ I'm thinking about trying to find a microcoded architecture to play with before I design something around the Intel 3000 series. I've got a MicroVAX 3800, so I suppose I could run MICRO2 to assemble the aforementioned microcode. But then what? I assume PALs would have to be burned to implement the new microcode. Or is it more complicated than that? I don't have a PDP-11/60, unfortunately. I do have an 11/45, though...so with this modification, I suppose one could have some fun: http://repository.cmu.edu/cgi/viewcontent.cgi?article=3241&context=compsci Thanks, Kyle

7 years, 10 months

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eBay search fail

by jnc＠mercury.lcs.mit.edu

So someone mentioned this to me: https://www.ebay.com/itm/222941705847 Now, the crazy thing is that I religously do a search for "PDP-11" for newly listed items on eBait at least once a day - and this never showed up! I just did a search for sold "PDP-11" items, and it's not showing up there either - although a search for sold "PDP-11 parts" turns it up! Anyone have any idea why it didn't turn up? That is a regular '-', not an mdash or anything, and those are 1's, not lower-case l's. And it does show up in the search for "PDP-11 parts". So I can only conclude that somehow eBait's search function blew out somehow? Anyway, someone got a total steal: at least _3_ H960's, a TU10, and an -11/45 (can't tell if there's an FP11) - and who knows what else is hidden! Noel

7 years, 10 months

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Announcement: VCF Midwest 13!

by silent700＠gmail.com

Summer is almost here and that means it's time to get it in gear and start planning our next Vintage Computer Festival Midwest. Astute readers will note that this announcement comes many weeks later than in past years, but rest assured there is still plenty of time remaining to make your travel plans, reserve a table or get yourself into the mood for a full weekend of classic computing fun. Here are the necessaries: What: The Thirteenth Vintage Computer Festival Midwest When: September 15-16, 2018 (note that that's one weekend later than the usual dates!) Where: The Holiday Inn Elk Grove Village, Elk Grove Village, Illinois - about 30 minutes west of Chicago with a free shuttle bus from ORD! URL: http://vcfmw.org More info for the uninitiated and VCFMW veterans alike: - We do not charge admission. Thus, we are a community-supported show, so we humbly beg your kind donations, which can be made via two different links at vcfmw.org, or at the show. - Always an entertaining spectacle, there will once again be an auction! This is the other way we fund the show, so your donation of old computers (or anything even marginally related) is greatly appreciated. If it's a little too nice to put in the Free Pile, please consider donating it as an auction item. - Typical show hours are 9am Saturday 'til late night, and then 9am-4pm on Sunday (clean-up begins around 3pm). Early load-in is usually available on Friday afternoon, hours at the hotel's discretion. - The show really begins on Friday night, at least for exhibitors. We typically go for an informal group dinner and return to the hotel to complete setup. Don't worry if you're getting into town late, you can still set up Friday night (until 11pm or so). If you're arriving Saturday morning, your table will still be reserved. - Tables fill up quickly! If you'd like to exhibit, please fill out the table reservation form at http://vcfmw.org/signup.html. If the form is closed, it's because the buffer filled up and we're still processing requests. We don't want to reserve space we don't have! - Hotel rooms at the Holiday Inn are available at the group rate of $92/night via the link at vcfmw.org, or by calling the hotel at the number listed on our site. If the online room block is full, please try calling the hotel directly. - There is an on-site restaurant in the hotel that serves breakfast through dinner and a bar that is open late-ish. Consensus seems to be that they have good food and not having to leave the hotel to eat is a big plus. Feel free to forward this email or post its contents to your favorite forum. We'll see you in September! -j Twitter: https://twitter.com/vcfmidwest Facebook: https://www.facebook.com/events/248644859019545

7 years, 10 months

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Apple (Lisa 2/10) MAC XL UNIX 5

by billdegnan＠gmail.com

I have a diskette labeled UNIX SYSTEM V VPI UNIX disk 'A' (vpi)* 8/85 UniPress Software, Inc. I have the small installation manual that talks about inserting the disk to serialize it, and how to install UNIX onto the Lisa 2/10 in Mac XL Mode. It is a small implementation of AT&T UNIX V. The disk is bad. Anyone have a process for recovering or reading an Apple Mac XL disk? This seems like a piece of software that should be preserved, as a curiosity. Does anyone actually have a working copy of UniPress Software UNIX for the Lisa XL? Bill

7 years, 10 months

2
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CDC 9762 drive, alignment disk and exerciser on Ebay.

by mattislind＠gmail.com

Someone is selling a drive that was just taken out of service ! And alignment disks and exercisers for CDC 9762 (it doesn't look like a 9766 / RM05 even though it says so in the listing) Probably useful to RM02 or RM03 owners as well. https://www.ebay.de/sch/rbembenek1/m.html?item=142830473695&rt=nc&_trksid=p…

7 years, 10 months

1
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VCF PNW 2018: Video is finally available!

by mbbrutman＠brutman.com

Video from our speakers at VCF PNW 2018 is now available. For those of you who have been asking thanks for being patient https://www.youtube.com/c/VintageComputerFederation501c3 Regards, Mike (/me slowly builds up the courage to start planning for VCF PNW 2019)

7 years, 10 months

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pdp8e rack header wanted (will trade for PDP 11 header)

by billdegnan＠gmail.com

Anyone want to trade a pdp8e rack header for a PDP 11 (pink/red) header? Does not have to be perfect. I am located in Landenberg, PA USA. I have other DEC rack-related parts to trade for this if that's not what you want. b

7 years, 10 months

1
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SunBlade 2000 workstations

by lyokoboy0＠gmail.com

I have 3 sunblade 2000 workstations for sale. They arrived as surplus equipment. One of the machines does not power on, the other two boot up to sun os with proprietary software that was used from the company they came from. THe drives must be wiped before i send them out. They are quite heavy, so that will be a factor in shipping. I am open to offers on a single machine or the whole lot, if you have any questions feel free to ask. I have some spare cpu's that fit the machines as well, although they all appear to have 2 cpu's installed already. --Devin D.

7 years, 10 months

1
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VCF East Photo Thread

by silent700＠gmail.com

Many are appearing on the VCFed mailing list already. Here are mine, with separate sets for the non-computer (but still interesting) stuff: http://silent700.blogspot.com/2018/05/vcf-east-2018.html I had a good time and recommend the show to all who can make it out there. -j

7 years, 10 months

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TI System V?

by derschjo＠gmail.com

Anyone have any idea where one might track down a copy of TI System V for the S1500 series? I've had these two TI UNIX systems for awhile now, a TI S1505 and a TI S1507 (68030 and 68040-based, respectively). They came without hard drives or OS media and so they've basically been doorstops. I asked around about OS media back when I got them (in 2013) and at the time I got no leads; I'm guessing things probably haven't changed, but I figured I'd ask again just in case... Seem like nice machines, wish I could do something with 'em... - Josh

7 years, 10 months

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ISO: Seattle Computer Producs 300 S100 board

by ethan＠757.org

I jumped the gun and bought a SCP 200B board. I grew up a DOS kid, so figured it would be fun to run 86-DOS. I found out about the SCP 300 board, that contains the boot loader and serial port. Anyone have an extra they would be interested in unloading? Thanks -- : Ethan O'Toole

7 years, 10 months

1
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brand new DC600A data cartridges

by elson＠pico-systems.com

Anybody need DC600A data cartridges? These are still in the carrying case, wrapped in the sealed wrapper. I have a box of 5. They are from early 1990's. I also have one used cart, but it is pretty dusty. Jon

7 years, 10 months

1
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VAX 4000 PSU (H7874) Schematics

by aaron＠aaronsplace.co.uk

I am trying to repair a VAX 4000 power supply. Does anyone have the schematics? I can't find anything on BitSavers and I'm not completely convinced it was even designed by DEC. The VAX turns on and the status LED stays on F. The DC lamp does not illuminate on the PSU. 5V rail appears fine but there is nothing from the 12V rail. There were some *very* dodgy looking caps which I have replaced, and some *very* exploded MOSFETs, which I have also replaced. If anyone has schematics, or know where I might find them, it would be much appreciated. Thanks, Aaron.

7 years, 10 months

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Looking for an ex-Sun employee; Alan Charlesworth

by jplist2008＠kiwigeek.com

Hey all; I'd love to talk to Alan Charlesworth, who used to work for Sun and (I believe) CRS before that. I'm interested in his perspective on some historical happenings and Sun design work. If anyone knows him and might be willing to get me in contact with him I'd very much appreciate it. Unfortunately while I can find several papers he's written they all provide his Sun address, and there are three other prominent Alan Charlesworths that are making searching for him difficult. My thanks for your help; - JP

7 years, 10 months

1
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New Listings for Sellam's Collection Sales

by kurt＠hamm.me

I, too, have emailed Sellam with no response. But, I guess I am adding to the "broad-based whine" Wow. Kurt. ---------- Forwarded message ---------- From: Sellam Ismail <sellam.ismail at gmail.com> To: Randy Dawson <rdawson16 at hotmail.com> Cc: "General Discussion: On-Topic and Off-Topic Posts" < cctalk at classiccmp.org> Bcc: Date: Wed, 6 Jun 2018 21:59:42 -0700 Subject: Re: New Listings for Sellam's Collection Sales Hi Randy. I have stuff that you can't find on eBay. And I am not offering the eBay experience. This is me, Sellam, you are dealing with. When I can find actual closing sales online (I need some place to start), I generally go on the lower end of the mean of the data I find. It's a collectors market, sometimes I'm high, sometimes I'm low, but I'm trying. Do you know how to assess the value of items as diverse as what I'm listing? I do, it's a lot of work. Come help out if you have the time, I'll trade you for stuff. The listed prices are what I'm asking, as stated. I'm always open to offers, as stated. I price fairly, to move it, and if something sits for a while, you have a good chance of negotiating a price more to your liking, if you ask, but know that I am willing to sit on some things. I invested a lot of time, effort, blood, sweat, tears and money into my collection over many years. I'd like to recoup some of it. All you have done is propounded a broad-based whine. if there's something that interests you but the price is not right, let me know. I'm making many sales and many deals, stuff is moving. Ask and ye may well receive. Just be reasonable. Sellam On Wed, Jun 6, 2018 at 7:57 PM, Randy Dawson <rdawson16 at hotmail.com> wrote: > Inspired by ebay for all the items there that never sell for the asking > price. > > > C'mon Sellam, you want to get out, how about lowering the prices a bit to > move things along? > > > ------------------------------ > *From:* cctalk <cctalk-bounces at classiccmp.org> on behalf of Ed Sharpe via > cctalk <cctalk at classiccmp.org> > *Sent:* Wednesday, June 6, 2018 7:50 PM > *To:* sellam.ismail at gmail.com; cctalk at classiccmp.org; > cctalk at classiccmp.org > *Subject:* Re: New Listings for Sellam's Collection Sales > > do the prices keep increasing? > > In a message dated 6/4/2018 10:02:53 PM US Mountain Standard Time, > cctalk at classiccmp.org writes: > > > Hi Folks. > > I've reorganized my sales listings into a Google Sheets set. The > introductory page is here: > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=0 > > Use the tabs on the bottom of the sheet to navigate to the various "rooms". > > New items have been added and are listed here: > > https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_ > HJ5oMKuab4zrApI_hiX0pNmy48/edit#gid=949372371 > > New items are always added to the New Arrivals Niche, so that's the first > place you should check when you visit my virtual online warehouse. I will > post a message to this list and the VCFed forums whenever new items are > listed, which will occur more regularly. > > As always, please inquire directly to me via e-mail for the fastest > response. > > Thanks! > > Sellam >

7 years, 11 months

1
0
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CDC 6600 display character generation

by jnc＠mercury.lcs.mit.edu

Hi, I'm hoping someone here knows the low-level nitty-gritty on how the characters on the CDC 6600 console CRTs were generated. Thornton, "Design of a Computer", says "Control of the beam .. is provided by electrostatic deflection ... electronically converting from the symbol .. to deflection voltages", but alas, doesn't say how that conversion is done. And I looked in some CDC 6600 documentation online, alas, even less detail. But looking at the characters (reproduced on the dust jacket), the curves sure make it look like it wasn't anything simple (e.g. using display vectors, as one source indicated). Does anyone know? (BTW, the VT11 in DEC's GT40 used bit maps for its built-in character geneator, and the hardware did tiny raster zones to display them!) Noel

7 years, 11 months

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20
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ISO: DD11-DF backplane

by derschjo＠gmail.com

Hi all -- I finally tracked down the EIS option for my 11/40 and I have it up and running nicely (Ultrix-11 ATM, but I'll be playing with other stuff). Right now I only have a 4-slot DD11 backplane for SPC/MUD boards and I'd like a bit more space for expansion. I have a few DD11-DK backplanes but without modifying the cabling it won't work in a BA11-F chassis. If anyone has a DD11-DF they'd be up for trading for the -DK variant (or for something else) please drop me a line. Thanks! Josh

7 years, 11 months

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Whence 556?

by tshoppa＠wmata.com

The 729 CE manual quotes 555 BPI. I?m not sure when it became 556. http://bitsavers.trailing-edge.com/pdf/ibm/magtape/729/223-6845_729_CEman_1… The IBM 728 was 248 BPI. Before that it was the nice round number 200 BPI. I tried permutations of standard IPS and round number data rates and don?t see anything that yields exactly 556BPI. Tim

7 years, 11 months

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Weird Lear-Siegler ADM-3A board

by jnc＠mercury.lcs.mit.edu

> Jon Elson > How/where should I submit this? This is now available through here: http://gunkies.org/wiki/Term-Mite_ST_Smart_Terminal I put in a little infrastructure around it (articles on the Term-Mite, NS405, etc), using info I dug up online. Noel

7 years, 11 months

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CDC 6600 display character generation

by jnc＠mercury.lcs.mit.edu

> From: Toby Thain > It's suggested there (without any proof though) that the CDC used a > Fourier process > ... > I'd be very interested to know what you find out about the circuitry. Someone very kindly pointed me at: http://www.bitsavers.org/pdf/cdc/cyber/cyber_70/fieldEngr/60125000C_6602_66… (although why it's in the Cyber70 folder, I'm not quite sure :-). I don't completely understand it (it's only drawings, no text, and the notation is unfamiliar), but I think I get the general drift - and it's pretty baroque! Very briefly, it appears to me that characters are generated from short vector-type strokes placed in a 7x7 matrix, with each stroke being encoded as motion of 0, 1 or 2 'boxes', both horizontally and vertically, from the 'box' of the end of the previous stroke. A character can contain up to 22 strokes, but most seem to average about dozen or so. The pronounced rounding which I noticed in the characters must be caused by the limited bandpass of the A-D system, amplifiers, etc - it can't actually do a sharp corner when going from e.g. a vertical stroke to a diagonal one. Or something like that.. :-) Noel

7 years, 11 months

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Sudden death of the HP 239X terminals by whiskering

by hp-fix＠xs4all.nl

Inspecting a newly acquired HP 2392A I found out the chassis was prone to whiskering all over the chassis. Whiskers are small metal hairs growing from pure metal (zinc or tin) and can when they connect to a power line create a shortage and electric arc damaging the electronics. Made some pictures and placed them in: https://www.flickr.com/photos/hp-fix/41897770664/in/dateposted-public/ It's best to remove them by using scotch brite or fine sanding paper, after that paint or coat the chassis with a clear paint or other nonconducting paint. More info about whiskering can be found at: https://nepp.nasa.gov/whisker/ https://en.wikipedia.org/wiki/Whisker_%28metallurgy%29 -Rik

7 years, 11 months

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WRQ Reflection 4+ DOS

by Flash688＠flying-disk.com

While cleaning out my office, I found a brand new, unopened copy of WRQ Reflection 4+ version 5.0 for DOS. It provides (per the box): Accurate emulation of Digital VT340, VT320, VT220, VT241, VT102, and VT52 terminals, with VT420 features. Windows-like interface with pull-down menus and dialog boxes. 132-column display with EGA, VGA, or special video adapters. Full keyboard mapping and mouse support. Etc., etc., etc. If anyone wants it, just let me know and I'll send it to you in exchange for the cost of postage (weighs 8 pounds). Otherwise I will toss it in the recycle bin next week. Alan "Pack Rat" Frisbie

7 years, 11 months

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Parts help - need flight SRAMs

by mtapley＠swri.edu

All, I have a need at work for an unusual SRAM chip (related to the New Horizons mission). if you have a source or supply of these parts: Part #=5962H9954103QXC Qty=2 (per board) Description: SRAM 256K x 8 Package=FPK40 Generic part#=LM2M8CRH-Q30X with which you?d be willing to part for a good cause, we would really like to know about it! Please contact me off-list, either by email or phone below, and I?ll happily put you in contact with the right folks. - Mark 210-522-6025 office 210-379-4635 cell

7 years, 11 months

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For the price of shipping. Oddball telephones

by tony.aiuto＠gmail.com

I have two rare desktop telephones taking up space in my basement. I know I never will play with or display them. - Pingtel Xpressa PX-1. An early IP telephone - ATT 8130 "Computer Phone". It has an RS-232 port in the back for bi-directional comms. I reverse engineered the protocol when I used this in 1996. Crappy software available on request. I may even be able to dig up the code Larry Wall sent me (Perl, of course) from the same era. Photos here: https://photos.google.com/share/AF1QipMJ-iCRhnHmiL9PoswsyJ2fiNTMK5Lw1xf 5TgpYr6UAo6ktLFAe6yEds5XvCIDoCg?key=WldvcDZnNEFlMmNza25ZLUdsN205R24zcFV2MHNR Local pickup on Long Island or Manhattan, NY. I will mail it to you if you pay the shipping via paypal or google pay. I will weigh it and calculate the shipping if there is interest, but I am not going to bother unless someone is interested.

7 years, 11 months

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RC25 (was Re: Modifying microcode)

by ethan.dicks＠gmail.com

On Mon, Jun 4, 2018 at 5:13 PM, Paul Koning via cctalk <cctalk at classiccmp.org> wrote: >> On Jun 4, 2018, at 1:17 PM, Robert Armstrong via cctalk <cctalk at classiccmp.org> wrote: >> >> ... FWIW, I have a 725 complete and working. Well, except for the RC25, which never worked even when they were new. I had an 11/725 in the 80s and 90s and never had a problem with the RC25 but they are legendarily terrible. > Hm. I remember some RC25s on RSTS, and they seemed to be ok. The fact that they had two drives on one motor made it strange, especially if the fixed platter was your system device. We had to teach the OS how to deal with SY: going away temporarily. Oof, yeah. When I used my 725, I didn't spin the RC25 up and down except when booting and shutting down. I also had devices like RL02s for removable storage. I often wonder how hard it would be to develop some other storage device for the KELSI but then other projects push to the top of the stack and I move on. Mostly, what I need is affordable ($250 or less) Unibus storage with modern media (Flash or IDE adapter or whatever). I don't really care what form it takes but Unibus SCSI cards are quite pricey and making a new controller is even less affordable (I used to make and support DMA-enabled Unibus communication controllers for a living so I have a pretty good idea of the amount of effort required). -ethan

7 years, 11 months

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Whence 556?

by cclist＠sydex.com

List: This is one that's bothered me for most of my adult life. As you may or may not know, there were three industry standard densities for 7 track 1/2" tape: 200, 556 and finally 800 cpi/bpi. So 200 and 800 are nice decimal multiples of 10. But 556 doesn't fit that pattern--it's not a "nice' number, being the product of 4 and 139 and doesn't correspond to any computer-related characteristics that I know of. It's not metric. So why 556 and not 400, 512 or 600? There's got to be a story there, somewhere. I think the 556 density came in around the 1401/7090 time with the 729 II. Anyone know the story? --Chuck

7 years, 11 months

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RC25 (was Re: Modifying microcode)

by jnc＠mercury.lcs.mit.edu

> From: Ethan Dicks > Mostly, what I need is affordable ($250 or less) Unibus storage with > modern media There's this: http://www.retrocmp.com/projects/unibone Not quite there yet, but getting there. Noel

7 years, 11 months

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Restoring a PC Server 500 P/390

by athornton＠gmail.com

I Frankensteined a P/390 together out of a P/325 server and the PCI P/390 card back in the day. I assume you do have the LIC for the P/390 card, without which you?re dead in the water. At least the PCI model wasn?t picky about the disks it used. And I?m pretty sure it?ll work with whatever the final Warp Server release was (4, maybe?) by which time the native TCP/IP support was a lot better. It was a nice little machine for its day, although Hercules is now many times its speed on modern hardware. I used mine to run VM/CMS and Linux (under VM) quite well. Adam

7 years, 11 months

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Mostek MK50312

by ajwills＠scorchingbay.nz

Does anyone have any datasheet/hardware details of the early Mostek calculator chip MK50312N ? It may be listed in "Mostek, MOS Integrated Circuit Guide", 1975 - a magazine sized, 138 page, blue and silver book.? Which apparently covers the F8 and several early memory chips and some calculator chips. (Not listed in the Mostek 1974 "Integrated circuit guide") Any help would be appreciated, even just confirmation that it is listed in the '75 guide. --Tony

7 years, 11 months

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