test-drb February 2014

test-drb@ccmp.vtda.org

191 participants
208 discussions

by seefriek＠gmail.com

From: Chuck Guzis <cclist at sydex.com> > >I've long thought that the strangling of the bus done on the TI 99/4 >home PC was quite possibly motivated by TI's not wanting to compete with >its own 990 series of computers. The cost of a TI 990/4 was >considerably higher than a 99/4, even though both use the same MPU. > I have heard & read this enough times to think there's something to it. Wouldn't be the first time this sort of thing has been done. >I find the I2L versions of the 9900 far more interesting as far as chips >go. They were used quite often in military gear, not as devices offered >to the general unwashed. In a similar way, one did not see the >Fairchild 9940 in much general audience gear. Yes. You can debate how good a general purpose processor the 9900 is, but it was proven to be a very good embedded controller. The memory mapped registers and workspace swapping made real time context switching a breeze compared to more conventional designs. From: John Many Jars <john at yoyodyne-propulsion.net> >Basically, my dad bought the wrong thing. It cost about 1/2 what an >Apple //+ would have cost, and was about 1/8 as useful. Ha! That is *exactly* how I ended up with my own 99/4. KJ

10 years, 10 months

Looking for "Super-5" disk driver schematics

by alexandre.tabajara＠gmail.com

Dear sirs, I'm looking for the schematics of the F-051MD chinon drive. This is the auto-eject "Super 5" slim drive for apple computers. Any helpers? Thanks Alexandre

10 years, 10 months

Signetic WOM

by wdonzelli＠gmail.com

Many of us know about the classic prank Signetic played back in the 1970s, with the WOM (write only memory) - but today I found out that the chips actually exist. The son of an acquaintance uploaded some pictures (on a different list) of the original sales kit Signetics mailed out, and included is an actual IC, I think a 24 pin DIP, marked S7324 2512D NFG. Interesting other stuff, too - including a fortune cookie (I think), bumper sticker, and funny nose & glasses. -- Will

10 years, 10 months

TI-99/4A acquisition

by dm561＠torfree.net

----- Original Message ----- Message: 6 Date: Sun, 23 Feb 2014 14:05:46 +1300 From: Terry Stewart <terry at webweavers.co.nz> Subject: Re: TI-99/4A acquisition > ...I definitely need some more carts though. ...and a wider desk...

10 years, 10 months

TRS-80 Mod 4 membrane keyboard

by snhirsch＠gmail.com

Any suggestions on repairing a dead spacebar key? All the online discussion I find pertains to an earlier model with individual keyswitches soldered into a PCB backplane. This keyboard is held together with melted over plastic posts and is obviously using a printed membrane. Before I launch in blindly I'd love to hear from anyone who's been through the process. Steve --

10 years, 10 months

Chameleon terminal

by shadoooo＠gmail.com

Hello, I found a serial terminal named Chameleon... Anyone have an idea of what kind of terminal is this? Andrea

10 years, 10 months

Anyone Have a Copy of the LAB-8/E 8K BASIC Binary?

by bobvines00＠gmail.com

Does anyone have the binary for the LAB-8/E version of 8K BASIC? Of course, the original source code would be better if that's available too. Thanks, Bob

10 years, 10 months

SCSI2SD

by aek＠bitsavers.org

Just saw this on Erik's web site, and hadn't seen it mentioned here http://www.codesrc.com/mediawiki/index.php?title=SCSI2SD Currently getting around 900kb/sec R/W

10 years, 10 months

VCF East exhibit reg. deadline

by evan＠snarc.net

Cctalkers, March 1 is the deadline to register VCF East exhibits. Anyone attempting to register after that will have to grovel to me and explain why "But I was busy!" applies to them and not to the 32 other people who found time... Full details about the show, agenda, schedule, etc. are at http://www.vintage.org/2014/east and you'll also find updates at http://www.facebook.com/vcfeast. Remember -- this is the first THREE-DAY show and anyone who goes Friday can win an oscilloscope.

10 years, 10 months

Another mystery PDP-8 board

by charlesmorris800＠centurytel.net

Another mystery board in my junk box... this one should definitely be for a PDP-8 because it has no signals on the F connector fingers. I've googled all the numbers on it and can't figure out what it's for. It has a Z80 CPU, some RAM and ROM, and a lot of bus drivers. There's an empty 40-pin socket at U1, don't know if it had another Z80 or what. http://s1181.photobucket.com/user/DrCharlesMorris/media/PDP-8/P02-21-14_205… The output(?) connectors are unique at least to me: http://s1181.photobucket.com/user/DrCharlesMorris/media/PDP-8/P02-21-14_205… Looks like four pin plugs would seat in those sockets (they aren't coaxial). Any clues? thanks Charles

10 years, 10 months

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test-drb February 2014