test-drb January 2008

test-drb@ccmp.vtda.org

221 participants
430 discussions

by bnansel＠bigpond.net.au

I've Googled till I'm blue, but I haven't been able to find it. What would be a good cross for a DEC 3639 PNP transistor? Or, failing that, what are the specs for this transistor? -Bobby

16 years, 11 months

Head alignment for legacy Sony FDD

by pludikar＠sympatico.ca

Hi, I've been trying to create a working Sony MPF50W (as found in the HP1650B logic analyser) from 2 damaged units. One unit had a fried board and the other unit had physically damaged heads. I moved the heads and track 0 sensor from the fried board to the other board and I need to do 2 things: a) confirm that the "new" heads are actually working and b) realign the track 0 sensor. I'm reasonably sure that the heads are okay, they show continuity on some of the pins, but I'm not 100% certain that is what I should be expecting. I can't find any obvious sources of information on where to probe to see useful signals from the heads or find any procedure to align the sensor. I have Tony Duel's diagrams of the HP9114 from hpmuseum.net . Any suggestions on where to find this information or how go about this would be really appreciated. Many thanks Peter

16 years, 11 months

Teletype 43 manual

by erzzf＠tiscalinet.it

Hi, I am looking for the teletype model 43 user manual and cable pinouts. Would you be so kind to help me? Thanks, Ernest

16 years, 11 months

Backing up TK50s (was: VMS 6.2 or older install media needed.)

by dave06a＠dunfield.com

> I'm not sure about the legal situation, but I think it would be worth > making a copy on some other media before the TK50s become unreadable. > > Regards > > Rob A timely discussion... Last week I received a total 4 TK50 drives, and a box containing 15 TK50 cartridge tapes. Of the four drives, one is a 1/2 height SCSI drive that is contained in a "low flat" DEC box (like the Microvax 3100). The other three are full-height TK50s, one of which is installed in a "cubish" (like the MicroVAX-2000) DEC box with a SCSI controller. The box is labled "TK50Z". I do know that this last drive was used quite recently. Of the 15 tapes, 8 of them appear to be original distribution media, and are "factory labled": AQ-FP13C-BN 03-Mar-87 MICROVMS V4.4 FULL BIN TK50 (C) 1986 DIGITAL EQUIP. CORP. AQ-FY80B-BN 03-Mar-87 MICROVMS V4.4 BIN TK50 MANDATORY UPD (C) 1986 DIGITAL EQUIP. CORP. AQ-JG62A-BN 03-Mar-87 MICROVMS V4.5 BIN TK50 (C) 1986 DIGITAL EQUIP. CORP. AQ-FP59C-BN 31-Mar-87 VMS LIC KEY BIN TK50 (C) 1986 DIGITAL EQUIP CORP. AQ-FP86J-BN W0035602 VAX FORTRAN 5.2 BIN TK50 FORT052,DEBUGMP050 (C) 1989 DIGITAL EQUIP. CORP. AQ-FP86E-BN 18-Feb-87 VAX FORTRAN 4.6 BIN TK50 FORT046 FORT (C) 1987 DIGITAL EQUIP. CORP. WIN/TCP Release 3.1 For MicroVAX VMS Computers License # 9074-IP _______ SID # ____________________ VD9962003 REV E uVAX TS11 DRIVER (C)1986 EMULEX The remaining tapes are mostly unlabled, although there are a few with handwritten labels: PSCA_E07042 Pathworks V4.2 Patch VAX/VMS 5.4-1 S/A BACKUP VMS V4.6 Q's: 1) Are any these titles already backed up somewhere? Are they worth backing up? (I assume everything requires licenses - I don't have the machine the VMS LIC tape was issued for). 2) What is the best way to backup these tapes to a more permanent media? Can they be read into binary files, and if so, can anything be done with those files? Presumably, as long as the tape blocks were archived, one could write a SCSI tape emulator if one really had to - or does such a thing already exist?) I have available: - Vaxstation 4000 VLC running VMS 5.5 - Vaxserver 3100 running OpenVMS 7.2 - Vaxstation 3100 running NetBSD All have SCSI ports. I relatively green at VMS from a system administration viewpoint (used it as a user lots in years gone by). I've never mounted or used tapes, but with a bit of guidance I'm willing to try and recover these if anyone has interest in their content. 3) What is "MICROVMS" - Is this just VMS (for a uVAX)? Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html

16 years, 11 months

Bells on terminals (was: Re: YouTube videos of ASR33, etc.)

by tsw-cc＠johana.com

The discussion of bells on terminals reminded me of a weird experience. I had built up a terminal using a Qume printing mechanism (Sprint 4 interface) and added a keyboard and UART to make it complete. The printer didn't have a "bell" so I had to make one. In looking around for a nice tone to use, I found the one from the baud rate generator (MC14411). Since I was using an ASCII sequence, I had little use for the 134.5 rate (it is used for IBM 2741's) so I picked it up and with the use of a (couple?) one-shot, I made it into the beep. It was 16x the rate, so the tone was 2153.3Hz (see the data sheet). It worked quite nicely, and was pleasant sounding enough. Both control-G's and I were happy. Then the terminal was hooked up to an acoustic modem. While this isn't bad in itself, the astute among us will note that the tone for the bell is very near the center of the passband (2025-2225Hz) of the originate modems detector. So, every time someone sent a control-G to the terminal ALL sorts of weird things happened. Needless to say, I changed the wire to a different tap on the MC14411 baud rate generator chip. Yes, hardware can have unexpected bugs. Somewhere I still have this terminal. Daisywheel printers were fun to play with. I have the schematics somewhere if anyone needs info. -- Sorry, No signature at the moment. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

16 years, 11 months

Backing up TK50s (was: VMS 6.2 or older install media needed.)

by aek＠bitsavers.org

Q's: 1) Are any these titles already backed up somewhere? -- many of them have been. The license PAKs are less common 2) What is the best way to backup these tapes to a more permanent media? -- I use Eric Smith's tape copy program http://www.brouhaha.com/~eric/software/tapeutils/ which generates .tap images on a Linux box using a TZ30. TZ30's are handy because the head is easily disassembled to clean; something you do a LOT reading TK50's from the mid-80's 3) What is "MICROVMS" - Is this just VMS (for a uVAX)? -- correct. somewhat stripped down version of same.

16 years, 11 months

PDP 11 rescue.

by silvercreekvalley＠yahoo.com

Thanks for the replies. I've sent emails off list. Ian. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

16 years, 11 months

NEC component description/datasheet

by bear＠typewritten.org

I'm trying to identify a couple of devices. Google is leaving me cold. Part numbers: NEC B975 (also has "L 96" marking) and NEC D1309 ("K 98", like the former). Both are TO-220 package. Can anyone help? Thanks! ok bear

16 years, 11 months

Reading Polymorphic double density double sided disk.

by cclist＠sydex.com

Date: Fri, 18 Jan 2008 18:20:45 -0800 From: dwight elvey <dkelvey at hotmail.com> > For this, I need a little help. Since the 8 inch drives were 32 sectored, > calculating tracks from a disk offset number was easy. 5.25 disk with 10 > sectored will require something different. Is there an easy way to to > separate track from sector using Z80 code? Dwight Do you mean "is there an easy way to divide by 10?". If so, yes: 0.100x = x/16+x/32+x/256+x/4096+x/8192 to about 0.04 percent (4 parts in 10,000). Truncate the series if you need less accuracy. Ask if you need Z80 code. Cheers, Chuck

16 years, 11 months

YouTube videos of vintage PDP-11/40, ASR-33, VT05, etc

by wacarder＠earthlink.net

>> I never knew that an ASR-33 had a bell like an old typewriter to >> indicate that your near the end of the line. Funny! The computers >> probably had a special microphone to hear it when printing a directory >> listing :-) > >I though the 'end of line' trigger for the bell was actually an option, >but that all Model 33s (RO, KSR, ASR) had the bell which was mechanically >triggered by a ^G character. >Oh yes, the VT50 series of DEC terminals have a little relay on the logic >board. It'spulsed to geenrate the keyclick and sent a square wave signal >to generate the 'bell' which sounds rather like a 'raspberry'. >-tony Maybe I need to make a video of the VT52 with the ^G bell sound. It is a strange sound. We used to write programs on the PDP-11 back in the 70s to "ring the bell" under certain conditions (winning a game, etc.). Note on my videos that the VT05 (DEC's early video terminal) also buzzes at the end of the line on long lines. Ashley

16 years, 11 months

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test-drb January 2008