test-drb July 2005

test-drb@ccmp.vtda.org

257 participants
628 discussions

by news＠computercollector.com

http://www.siliconvalley.com/mld/siliconvalley/12034644.htm ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Also see http://groups.yahoo.com/group/midatlanticretro/ *** Tell your friends about the (free!) Computer Collector Newsletter - 750 readers and no spam / Publishes every Monday / Write for us! - Mainframes to videogames, hardware and software, we cover it all - W: http://news.computercollector.com E: news at computercollector.com

19 years, 6 months

Old Bond Movie with Apple IIc

by cb＠mythtech.net

>Just watching A View to Kill (Roger Moore as Bond) on SPIKE Cable TV and in >the bedroom scene were they talk about the earthquakes the female actress >goes to her dresser to check the computer. It's a Apple IIc with a green >IIc monitor and shows graphics of the oil field were the quakes are happing. Wow, what a sad bunch we are when we stare at the computers and not Tanya Roberts. (yes, I noticed it was an Apple as well) -chris <http://www.mythtech.net>

19 years, 6 months

Old Bond Movie with Apple IIc

by jrkeys＠concentric.net

Just watching A View to Kill (Roger Moore as Bond) on SPIKE Cable TV and in the bedroom scene were they talk about the earthquakes the female actress goes to her dresser to check the computer. It's a Apple IIc with a green IIc monitor and shows graphics of the oil field were the quakes are happing.

19 years, 6 months

Reading 9-track tapes in Linux

by vcf＠siconic.com

Ok, it seems everytime I try to do something, there has to be about 96 unproductive hours filled with failed attempts to do even the simplest things, like installing Linux for example. I'll spare everyone the lame details, suffice it to say that, now that everything is hooked up, I have been unable to successfully read a 9-track tape. I can certainly get the tape to do stuff like forward through files, rewind, get the status, etc. using mt. That much works. However, if I try to READ a file, and I've tried this with dd and Eric Smith's tapedump utility and whatnot, it always returns with 0 files read. It apparently sees the file marks as it will say its reading file 1, file 2, etc., but it never actually dumps anything. I've tried the multiple tapes at multiple densities and they are tapes I've read before on another system. WTF??? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

19 years, 6 months

LF: Epson HX-20 service info

by dave04a＠dunfield.com

Fred, Sellam : Thanks for the info on "Uncle Roger", I'll keep it on file as a reference. Tony sez: > 1000pF VL > 820k C31 --- > R78 || | > +--\/\/\---+--||----+ |\ +----------------+ > | | || | +--| >o-----+ | | > | / | | |/ 2C/c | | C12 === > | \ R74 | | | | 47uF --- > | / 390k | | |\ | V D6 | > | \ | +-=| >o-----+ --- 1S2075 --- > | | | | |/ 2C/b | 10u | /// > | |\ | |\ | | | C2 | > +--| >o----+-| >o---+------+ |\ | | [] | +---VLD > |/ |/ +--| >o-----+--| []---+--->|----+--------+ > 2C/d 2C/e | |/ 2C/a | | [] D7 | | > | | 1S2075 | | > | |\ | | | > +--| >o-----+ C1 === C6 === > |/ 2C/f | 10uF --- 10uF --- > | | | > D5 --- --- --- > 1S2705 ^ /// /// > | > --- > /// > >That's an ASCII-art version of the appropriate bit of the schematic. Section >d )Input on 10, output on 10) and e (input on 11, output on 12) of IC 2C form >the oscillator, the other 4 inverters are paralleled up as the driver. > >Hope that helps. Thanks - it did. I followed the "AC" through, and could see a nice waveform coming out of the 2C driver, however from there it degraded to what I described before at the C1 cap - on a hunch I replaced C1, and the voltage rose to about 7v, and the display was readable, however it was also flickering, and I could see the voltage rising and falling by a couple of volts - I replaced C6 and now it's rock solid, and the display is perfect. C1 and C6 were identical 10uf 16v caps, and that fact that both appeared to have failed gives me concern for the other electrolitics in the machine, which I will check out shortly... but notwithstanding that the machine is functioning perfectly. Next problem is that the microcassette drive appears to be "stuck" with the heads and capstan forward - not really stuck, as you can push them back on their spring, however they are not retained back as they should be - prevents inserting and removing tapes - I haven't opened it yet, but will shortly ... is there any useful info about the drive machanics in the service manual? I assume there must be some kind of solinoid and latch to hold them back and release them? Once again: THANKS! for taking the time to "ascii art" the LCD power supply schematic ... VERY much appreciated! Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

19 years, 6 months

WOW!!!! $15k DEC PDP-8 CLASSIC MINICOMPUTER SYSTEM DIGITAL PDP8

by aek＠bitsavers.org

> Wow! Somebody really wanted that one! Straight 8 CPUs go for over 5K, so a clean complete system with TC01/TU55's and DF32's in original mid 60's cabinets is about right at 10-15k. I assume Bill is going to prep/ship it himself (making sure to REMOVE the glass front panel and packing it separately) So... is he going to sell the OTHER Straight 8 CPU that he has now? :-)

19 years, 6 months

Swapping Hi density drives for low density drives

by mbbrutman＠brutman.com

Hi Grumpy :-) On the Windows 2K machine I used /F:720 to get a 720K format. On the Linux machine I used /dev/fd0D720, which should be equivalent. It was definitely a 720K format, as other parts of the copied DOS 3.3 diskette were readable. Only parts of track zero were consistently bad across the multiple diskettes, and they were not flagged as bad on the other machines. Even when formatting on the Jr (booted with the original DOS diskette and trying to format double density) the format fails. I wasn't aware of DOS 3.2 and 3.3 falsely reporting media problems when straddling a 64K boundary. I wasn't running with TSRs, but the Jr has timing problems of it's own. I don't think this was the problem though - DOS 3.3 was fine. So it still looks like a double density diskette prepared in a 1.44MB drive works fine on modern machines, but isn't quite right when the 1.44MB drive is running on an old controller. Like a timing issue. Double density diskettes cut on genuine 720K drives work fine. I'm thinking of getting a special breed of Teac 1.44MB. It has a different model number, and it has jumpers and a modification procedure published by Teac to make it a substitute for an original 720K drive. That would be an interesting experiment.

19 years, 6 months

TRS80 Model 1, monitor, expansion interface, 2 Percom drives, & system desk avail in N.J.

by redodd＠comcast.net

Hello, I have obtained a TRS80 Model 1 setup that needs some work. The computer has video problems and a broken 24pin cable that connects from the component side of the mobo to the little board that sits under the numeric keypad. I broke 2 pins off the connector when I reseated all the chips & connectors. This is a well used system with the plastic case showing lots of wear around the keyboard. I didn't do anything with the expansion interface. The 2 drives are single sided because I can see pressure pads. The Tandy system desk is in nice shape. It is located in Fairfield, N.J. Also included are some cassettes, original TRSDOS 2.1-2.3 manual (poor shape) & 2.3 disk, copy of NewDos80 manual, copies of Visicalc dics & disk, copies of terminal control program & electric pencil docs, original NewDos+ docs in good shape, original DosPlus 3.4D manual & disk, and many TRS80 Monthly Magazines. A lot of the documentation is wavy from moisture and the disks are similar. If anyone is interested in restoring this system, "Lets make a deal". Thanks a lot. Ralph

19 years, 6 months

Another S100 manual request

by rcini＠optonline.net

All: As I slog through the S100 card collection I got with the IMSAI a few weeks ago, I keep finding RAM cards from different manufacturers. I now need a manual for a Solid State Music MB7 16k board. If anyone has it, please let me know. Of course, the offer stands for me to scan it for the group. Thanks. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

19 years, 6 months

Help setting up a SBS/Bit3 PCI-to-VMEBus cards

by aek＠bitsavers.org

Does anyone know how to set these boards up? I have a SBS 616 PCI adapter and its corresponding VMEBus adapter. -- pdfs of manuals for both boards were up on the bit3 web site. If you can't find them there any more i'll put them on bitsavers. does your VME card have the shared memory daughter card?

19 years, 6 months

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test-drb July 2005