test-drb September 2013

test-drb@ccmp.vtda.org

168 participants
203 discussions

by LYNCHAJ＠YAHOO.COM

Hi The S-100 6502 CPU V2 PCBs have arrived! http://www.s100computers.com/My%20System%20Pages/6502%20Board/6502%20CPU%20B oard.htm http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=S-100%206502%20 CPU%20board%20V1 All the pre-ordered boards have been sent to their builders. There are still a few boards left in case there are any late comers or those builders who did not want to pre-order. The PCBs will be $20 each as per the usual arrangement. Shipping in the US is $3 for a single PCB and $2 for each additional PCB. Shipping internationally is $10 for a single PCB and $3 for each additional PCB. This is for the bare basics USPS first class postage with no tracking or insurance. The builder assumes all risk of delivery as per usual arrangement. Please send a PayPal to LYNCHAJ at YAHOO.COM and I will send your board(s) right away! Please contact me if you have any questions. Thanks and have a nice day! Andrew Lynch

10 years, 8 months

Install Disks for AT&T 3b2/400

by anthony＠changedearth.com

So I've had a 3b2 sitting on a shelf for the past few years. Prior to that, it lived in car trucks and basements, since about November 1993. Presumably, it was never powered on. A couple weekends ago, I ran across it while cleaning and, weighing the risks, connected it to a terminal and powered it on. It booted happily, checked its disks successfully and allowed me to add an unprivileged user account. It's running System V Release 3.1 for the AT&T 3B2, Version 2. Other than the unsurprisingly dead Tadiran clock battery, it's pretty cool. It even has an ethernet board. The one thing I can't do, however, is change the root password because I don't have the install diskettes. From my research, I've seen that a 3b2 without install disks can be considered "down" for all intents and purposes. Can anyone contact me on or off list about getting originals or copies of the install disks? Thanks. Anthony

10 years, 8 months

Looking for some basic, older tech...

by jon＠jonworld.com

All, I'm working on my STEM outreach project, and I need some "props." These items can be broken, as they're supposed to be passed around and examined by elementary-school aged children. I'm looking for the following... Punch Cards (used, unused, scrap, etc.) 8" Floppy Paper Tape(?) Sextant (long shot, I know. I'm reaching out to some pilots I know.) -- -Jon Jonathan Katz, Indianapolis, IN.

10 years, 8 months

FS/FT Apple IIgs (in Paris)

by stephane.tsacas＠gmail.com

Hi, I found a box with an Apple IIgs plus some bits which go with it (keyboard, maybe an hard drive or floppy disk drive). The Apple IIgs is an Apple II on steroids : 16 bits, up to 8 MB of RAM, etc. See https://en.wikipedia.org/wiki/Apple_IIGS If someone is interested, drop me a mail, I'll make an inventory of what's available. -- Stephane

10 years, 8 months

Rare opportunity for IC chips dating back to the 70s; these are NEW

by sales＠elecplus.com

One of my recyclers has provided me with an Excel spreadsheet of IC chips that date back to the 1970s. All are NEW. She is willing to sell in small quantities to end users, and will accept PayPal for payment. Prices are by offer, there is no set pricing. Please be fair, since this is an experiment to see if she will let me offer other old stuff out to the end users. Please email me at sales at elecplus.com if you want the spreadsheet. I will include instructions for contacting her directly. Cindy Croxton Electronics Plus _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3222/6641 - Release Date: 09/05/13

10 years, 8 months

Shameless push: HP 82231C Viper board on ebay

by hp-fix＠xs4all.nl

I placed one of my Viper boards on epay, it includes manuals and software. Item: 370891646638 I also placed some HP-41 Application Pac's on epay Petroleum Fluids Navigation Math Stat And others Some items are auctions other fixed price. For fixed price items I'm always open for reasonable offers. -Rik

10 years, 8 months

Toshiba CD-1000C Cartridge Tape Drive

by mark.darvill＠mac.com

Has anyone come across one of these before and more importantly (to me!) has anyone any data sheets or a manual on the tape drive. The drive has a Toshiba label on it saying "Cartridge Tape Drive MTH 0551 F001 Model No. CD-1000C" and has a direct drive capstan. It looks like a 1/2" Cartridge Drive and it was used on the Data General Desktop Generation E6270 drive. I can find no mention of it on the internet so far! Thanks, Mark

10 years, 8 months

PNG image decompression

by aliensrcooluk＠yahoo.co.uk

Hi, I am in the process of working on a new Amiga game, but I have the graphics saved in .PNG format. I could convert them to the much easier to decompress .IFF format, but .PNG image save many more bytes (e.g image is 15KB saved as an .IFF vs. 9KB as a .PNG). I have sucessfully decoded all the easy stuff, but am currently trying to decode the IDAT chunk (where the image data is stored). The format of the data is defined as follows (straight out of the RFC1951 Deflate Compression document available online): ??? 5 Bits: HLIT, # of Literal/Length codes - 257 (257 - 286) ??? 5 Bits: HDIST, # of Distance codes - 1 (1 - 32) ??? 4 Bits: HCLEN, # of Code Length codes - 4 (4 - 19) ??? (HCLEN + 4) x 3 bits: code lengths for the code length ??? alphabet given just above, in the order: 16, 17, 18, ??? 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ??? These code lengths are interpreted as 3-bit integers ??? (0-7); as above, a code length of 0 means the ??? corresponding symbol (literal/length or distance code ??? length) is not used. ??? HLIT + 257 code lengths for the literal/length alphabet, ??? encoded using the code length Huffman code ??? HDIST + 1 code lengths for the distance alphabet, ??? encoded using the code length Huffman code ??? The actual compressed data of the block, ??? encoded using the literal/length and distance Huffman ??? codes ??? The literal/length symbol 256 (end of data), ??? encoded using the literal/length Huffman code. All the documents I found online either say use the zlib library or point to the RFC1951 document :( Does anyone know how to decode the literal / length (HLIT) and distance codes (HDIST)? Huffman compression was always something I found hard, but it seemed much easier after finding this page online: http://www.cs.duke.edu/csed/poop/huff/info/ Regards, Andrew B aliensrcooluk at yahoo.co.uk

10 years, 8 months

Teletype Corp. motors

by jules.richardson99＠gmail.com

I found a small pile of boxed NOS Teletype corp. motors in a junk store earlier: small, p/n 177870 (115VAC, 3250rpm at 60Hz) small w/reduction gearbox, p/n 193958 (115VAC, 110rpm at 60Hz) medium, p/n 319392 (115VAC, 1725rpm at 60Hz) medium dual-shaft, p/n 337286 (115VAC, 3600rpm at 60Hz) medium with frame, capacitor & thermal reset, "28F motor unit" (3600rpm at 60Hz) medium dual-shaft, p/n 195801 (115V, 3600rpm at 60Hz) large, p/n 159739, marked as "unit motor 28C" There are a few dates which place them around the late 1960's / early 1970's. There's a wiring diagram in with the "28F motor unit" which claims to be for "CXB-1 and MU43 motor unit". Any ideas what equipment they were for? Model 28 machine, perhaps, given the 28C and 28F references... cheers Jules

10 years, 8 months

FS: 1200 baud external modem

by charlesmorris800＠centurytel.net

FS: one "BSR 1207" external modem. New in the (very old) box. I assume it's 1200 baud. Runs on 120 vac. Can send pic to interested parties. $5 plus shipping (probably around $3-4, it's light) from US zip 65775. thanks Charles

10 years, 8 months

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test-drb September 2013