test-drb July 2013

test-drb@ccmp.vtda.org

178 participants
195 discussions

by slandon110＠gmail.com

Got the following stuff that need homes Brand New in Box Apple Keyboard II with cable $20 dollars BackPack 5.25inch Parallel Port Floppy Drive- Missing PSU, Requires 12V 1.25AMP DC HaBaDisk 800k Floppy Drive for Macintosh $20 dollars Macintosh SE Logic Board with MacViking Video card- comes with all cables and hardware to install into a Mac SE $40 dollars Nice early 82 Apple IIe system with Monitor 2, 2 Matching Disk IIs, Super Serial card and Microsoft Softcard Z80 Card $200 1 Early 83 Apple IIe, one broken key, works $25 1 Later //e Enhanced, Broken Delete Key otherwise works fine $25 I accept PayPal Thanks Steve

11 years, 5 months

WarGames IMSAI machine for sale (again) • The Register

by woyciesjes＠sbcglobal.net

http://www.theregister.co.uk/2013/06/27/wargames_imsai_machine_for_sale_aga… -- --- Dave Woyciesjes --- ICQ# 905818 --- CompTIA A+ Certified IT Tech - http://certification.comptia.org/ --- HDI Certified Support Center Analyst - http://www.ThinkHDI.com/ Registered Linux user number 464583 "Computers have lots of memory but no imagination." "The problem with troubleshooting is that trouble shoots back." - from some guy on the internet.

11 years, 5 months

early Apple/Mac stuff

by sales＠elecplus.com

Someone has claimed the entire batch. Thank you much for all the responses. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3345 / Virus Database: 3204/6453 - Release Date: 07/01/13

11 years, 5 months

Battleship terminal BB61

by jws＠jwsss.com

When the sailor gets into a battle station situation he could take the terminal with him for either armor, or to use the keyboard to bash someones brains out, or strangle them with the cable. Looks appropriate for the USS Iowa, or any of the 4 Iowa class ships. http://www.navsource.org/archives/01/0161020.jpg page of photos is at if you want to see more BB-61 http://www.navsource.org/archives/01/61g.htm Thanks Jim

11 years, 5 months

C64 Power Supply Replacement Options

by brain＠jbrain.com

Since I support the CBM crowd, I've had more than a few people send me comments over the past few years, asking when I might consider offering a replacement power supply for the home computing machines (VIC-20, 64, 128, +4) Initially, I resisted for liability reasons and certification costs. But, I decided earlier this year to put off those questions for a bit and just see what might be technically and economically possible. I've chased a few ultimately fruitless options, and I thought I'd see if some fellow soul on this list might have some ideas. Obviously, the first thought was a complete custom supply. My interest was never in power design, so I am ill-equipped (and uncertain of my abilities) to design such an item myself. Thus, I started looking for a manufacturer that could design one. Absolute requirements: 5VDC at 4.3A. 9VAC at 9VA unregulated To this I added my requirements: The 5VDC be a switching PSU output ISO C13 input power jack (so I can support many areas without building custom power cords 115/230 switchable design (or two very similar designs that can handle the 2 voltages) My cost under USD$30.00 per unit. Enclosed finished case, or be able to fit in a commonly available case design. Someone put me in touch with Stontronics overseas, which worked on an initial quote. But, I think the C13 and 115/230 requirements scared them off. I solicited information from Bear Power Supplies in the US, but they did not seem too keen on continuing the discussion, so I have nothing from them. I've also tried overseas suppliers, but I have not yielded fruit yet. I've asked all the PSU suppliers on globalsources.com and alibaba.com I have struggled to find a custom PSU manufacturer that can handle a suitable design. Being frustrated with the direct approach, I thought I'd try a different path, and find a 9VAC or 5VDC single output power supply. I found a single output large amperage 5VDC supply, but then I got stumped on finding a way to synthesize a 9VAC isolated output from the 5VDC. A simplistic approach would involve creating a harsh +-9V square wave, but it needs to be at least .5A (to run the cassette deck on the 64/128), and I worry that the noise on a square wave @ 1A would wreck the audio and video noise level in the machine, which is not the best to start with. Even ignoring that, I need to double or quadruple the voltage to get the 18V rail to rail voltages I need. On the 9VAC front, I had little luck finding a suitable 9VAC supply that is 45VA or 63VA to support a 5VDC at 5A draw while leaving enough for the 5A 5VDC output. As well, I am not sure I am equipped to design a switching 5V PSU from a 9VAC source. With the old power bricks getting more brittle and prone to failure each day, I feel some sense of urgency to find some solution for folks. For liability reasons and because 5VDC is the more important voltage in the units, I myself lean towards a small box that turns 5VDC into 5VDC and 9VAC, but designing a voltage doubler/sine wave generator/isolation transformer solution is far beyond my comfort zone. If this is not a complicated task, I am wondering if someone on-list is up for a small freelancing effort to design such a unit. It needs to contend with the issues outlined in this PDF (http://www.ide64.org/power_des.pdf) in that the noted design won't work as is since I think people need to be free to use the power switch on their machine. There might not be a reasonable solution, but I thought I'd share in case I am missing an option. Jim -- Jim Brain brain at jbrain.com www.jbrain.com

11 years, 5 months

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test-drb July 2013