test-drb July 2008

test-drb@ccmp.vtda.org

182 participants
225 discussions

by quapla＠xs4all.nl

Hello All, I have available one PDP 11/35 in a 10.5" BA-11 box. It contains the processor backplane, programmers console, a cpu with the base processor, EIS option, stack limit, MMU and a 256Kb memory card. Next to that is has a 9 slot DD11 expansion backplane, and optionally a complete RK-11D disk controller. Please contact me off list with your offer. Thanks, Ed

15 years, 10 months

Apple Lisa 1 - restoration project

by cclist＠sydex.com

Vinegar! Vinegar! Vinegar! The common household type! >From a US cook's standpoint, if "vinegar" is specified with no qualifiers, the type is determined by the application. If I'm making a salad, a flavored vinegar, such as wine or malt or even apple cider vinegar is used. Balsamic vinegar has lots of gunk in it and is used for a more complex, somewhat sweet flavor in marinades and salad dressings. I'd never think of using it to clean a PCB. Rice wine vinegar is often used in oriental cooking--somewhat sticky when the water evaporates. If I'm pickling (e.g. dill pickles or making sauerkraut), I'll use distilled white vinegar (usually about a 5% solution) as it's the least expensive (commonly sold in gallon jugs). The same vinegar is used for removing lime deposits from a steam iron or coffee maker and for washing windows (if lime stains are present). Just plain old dilute acetic acid, source not important. Brass musical instrument players soak their instrument's valves and tubing in white vinegar to remove deposits left from saliva. Doesn't hurt the brass at all and leaves little smell behind. Sulfamic acid (dry crystals obtained from a paint store) is often used when cleaning masonry indoors where the fumes of muriatic acid would be objectionable. It's stronger-acting than vinegar, but less than muriatic acid and conveniently mixed from the crystals and water as needed. Cheers, Chuck

15 years, 10 months

Serial Keyboards on eBay...

by lbickley＠bickleywest.com

I recently restored a system that required a TTL serial keyboard. I initially "hacked" a setup using a VT520 (RS-232) with a "SchmartBoard" RS-232 to TTL converter. Then I found several Keytronic RS-232 serial keyboards on eBay from a single vendor. After reading the specs, I found the keyboard supports both RS-422 and RS-423 by jumper settings. The default setting is RS-422 - which means that one can use "one-side" of the differential output as TTL serial. It also defaults to 300BPS - which is what I needed. (The specs say it can do 9600BPS as well). For those who care, the keyboard is "driven" by an 8048 8-bit microcontroller. I bought four of these keyboards in a previous auction from the same vendor and they are in excellent condition. He now has them listed again as item #300237350802. Starting bid is $9.95... Regards, Lyle -- Lyle Bickley Bickley Consulting West Inc. Mountain View, CA http://bickleywest.com "Black holes are where God is dividing by zero"

15 years, 10 months

Heathkit ETA-3400 Modifications

by dfinell＠satx.rr.com

Paul, While trying to find a Heathkit ETA-3400 I ran across your message authored in 2004 requesting a copy of interface/ops manual for this part. I believe I have the info you are looking for. Please let me know if you still need the info. 73's David Finell N7LRY

15 years, 10 months

Colorado Memory Systems Jumperless Tape Controller 026-328 Info?

by glen.slick＠gmail.com

Anyone have any info on a Colorado Memory Systems Jumperless Tape Controller 026-328? It's an 8-bit ISA card with an Intel 82077AA floppy controller. I have no intention of using this as a tape controller, but wondering if it would be useful as a floppy controller? Anyone have on programming info for this card? In addition to the 82077AA and 24MHz crystal there are 3 PAL16L8 and 2 PAL20L8. That's probably more logic and what would be needed for I/O address, IRQ, and DMA routing alone, but maybe not.

15 years, 10 months

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test-drb July 2008