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101090 discussions

by sales＠elecplus.com

All of these are gone, except for some AC adapters. Some Tandy 1000 series left. No Apple II or IIe, just lots of Apple/Mac laptops. Lots of classic IBM compatible laptops, from 8088 to P3, various stages of completeness, mostly untested. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-792-3400 phone 830-792-3404 fax sales at elecplus.com AOL IM elcpls

11 years, 11 months

DE9 pigtail pinouts

by dgriffi＠cs.csubak.edu

While I'm prepping parts for P112 kits, I started thinking about DE-9 pigtails. These things come in two different pinouts. One of them is pin-1 of the header connects to pin-1 on the DE-9. When wiring up a pigtail like this manually, you cut the ribbon cable into two sections. One sections goes on the top row of the DE-9. The other section goes on the bottom. The other one has the pins interleaved. See http://661.org/p112/files/pigtail.pdf for what I mean. The P112 was designed with the second pinout in mind. When I bought pigtails for my first run of P112s, I managed to get that kind. For subsequent runs, I always got the first kind. Which pinout is more common with actual devices? I ask this because I'm tinkering with an amateur radio project that will eventually use DE-9 pigtails. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

11 years, 11 months

Radio Shack computer desk for Model II?

by nf6x＠nf6x.net

Here's another long shot: Does anybody near southern California have one of the Radio Shack computer desks that were configured to hold a Model II that they might consider parting with, like the one in this catalog page? http://www.radioshackcatalogs.com/html/catalogs_extra/1979_rsc-03/h002.html Or any of the other computer desks sold by Radio Shack for the TRS-80 machines, for that matter? -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

11 years, 11 months

Help? Any Data General DG10 documentation/software available

by colineby＠isallthat.com

Hi ? Thought I?d see if there were any list members who could provide background information on the Data General DG10. We?ve received a working system as a donation, but there?s no software or documentation with it. I understand the hardware was very specific to the model since it used a MICROeclipse coupled to an i8086. What I don?t know is whether we need to locate model specific disk images to run AOS or RDOS on it. Also not sure how specific application code has to be. It would be useful to find service manuals, programming manuals and media. I understand Wild Hare Computers was working on an archive, but there doesn?t seem to be much in the public domain as yet. Can anyone offer any guidance? Thanks Colin

11 years, 11 months

TRW/Motorola CPUAX information?

by spacewar＠gmail.com

Has anyone ever seen any detailed tech info on the TRW/Motorola CPUAX, circa 1989? It's mentioned in Motorola's annual report and in some trade journals, but I can't find any info that wasn't just press release stuff.

11 years, 11 months

CMD CI? disk arrays

by aek＠bitsavers.org

http://www.ebay.com/itm/351154468219 the coax coming off of them got me wondering, are these CI attached disk arrays?

11 years, 11 months

Power supply debugging advice (Interact Model One)

by derschjo＠gmail.com

While I wait for PROMs to arrive for my 11/05 I've pulled another "back-burner" project off the shelf. It's an Interact Model One (http://oldcomputers.net/interact.html) and it's having power supply issues. The symptom: At initial startup after being off for any significant period of time (say, 10 minutes or longer) the +5V comes up for 2-3 seconds then drops to zero. The other supplies (+/- 12V) are fine. What I've done so far: - Recapped the electrolytics in the supply (I had the parts on hand, and it's three capacitors. Sorry for the shotgun approach, Tony :)). - Removed socketed 2114 RAMs (in case one was shorted). No change in behavior. The power supply and logic are incorporated into a single PCB, so it is difficult to separate the two (I guess I'd have to figure out what traces to cut, and I'd rather not mangle things if I can avoid it). The DC supply is fed by an external "wall wart" which I *believe* just contains a transformer -- it outputs several flavors of AC (16.5V and 19V), no DC. Any suggestions for where to start with this? Power supplies are voodoo to me, still. The power supply schematics can be found in here: http://www.thebattles.net/oddments/interact/InteractSchem.pdf (page 6, lower right corner). Thanks! Josh

11 years, 11 months

Some Altair questions, if I may.. (drlegendre .)

by dm561＠torfree.net

Good advice for me too ;-) - sorry about the subject line in my previous post... ----- Original Message ----- Date: Sun, 24 Aug 2014 10:48:46 -0500 From: "drlegendre ." <drlegendre at gmail.com> Now back to your original point, the one you felt I was missing.. > Pin #41 had the 470 to gnd, but no 330 to VT+, so it was at a true logic low, pulled down by the 470. This causes the 7404 output to go high, turning off the LED. When I connected the 330 part, Pin 41 came up to 2.8VDC (about 1/2 of VT+) which I guess the 7404 sees as a high (?) switching off the 7404 output and turning on the LED. > All good so far? -----Reply: Just like your misleading post about the LM309's output being connected to the 8V supply rail, you had specifically said that "there aren't *any* resistors connected to it, which is why it's sitting low. I checked that out." No mention of the 470 ohm pull-down resistor... Maybe you could save some time by checking more carefully before posting...

11 years, 11 months

cctalk Digest, Vol 132, Issue 49

by dm561＠torfree.net

----- Original Message ----- Date: Sun, 24 Aug 2014 10:48:46 -0500 From: "drlegendre ." <drlegendre at gmail.com> Now back to your original point, the one you felt I was missing.. > Pin #41 had the 470 to gnd, but no 330 to VT+, so it was at a true logic low, pulled down by the 470. This causes the 7404 output to go high, turning off the LED. When I connected the 330 part, Pin 41 came up to 2.8VDC (about 1/2 of VT+) which I guess the 7404 sees as a high (?) switching off the 7404 output and turning on the LED. > All good so far? -----Reply: Just like your misleading post about the LM309's output being connected to the 8V supply rail, you had specifically said that "there aren't *any* resistors connected to it, which is why it's sitting low. I checked that out." No mention of the 470 ohm pull-down resistor... Maybe you could save some time by checking more carefully before posting...

11 years, 11 months

RSX-PLUS-III

by mattislind＠gmail.com

Many years ago my father recovered a whole lot of documentation from a PDP-15 system at Philips in Stockholm that unfortunately already was gone (scrapped or given away). The lot is several meters worth of shelf space. I have put a photo of the cover of one of the manuals online: http://www.datormuseum.se/documentation-software/pdp-15-documentation I checked bitsavers quickly but didn't find a matching document. Are these documents already online somewhere or should I bother go through the whole lot and document what kind of document there are? /Mattis

11 years, 11 months

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