test-drb May 2002

test-drb@ccmp.vtda.org

246 participants
947 discussions

by dougq＠iglou.com

My LA120 makes these snapping sounds when first turned on, sourced from the pedestal, that sound a bit like a flyback arcing. I'm guessing its the SMPSU crying out in anguish. Is there anything I can do, or do I need to start looking for a replacement LA-120 PSU? -dq

22 years, 1 month

IBM 026 Printing Card Punch

by dwightk.elvey＠amd.com

>From: "Ben Franchuk" <bfranchuk(a)jetnet.ab.ca> > >"Dwight K. Elvey" wrote: >> >> Hi Sam >> Check: >> >> http://www.alltronics.com/tubes3.htm > >> >Missing, which is probably why the keyboard doesn't work. According to >> >John L. it's a common tube (25L6) so I'm going out to look for a >> >replacement today. > >www.tubesandmore.com has the 25L6 for $6.00 US. >-- >Ben Franchuk - Dawn * 12/24 bit cpu * >www.jetnet.ab.ca/users/bfranchuk/index.html > Hi Alltronics has them at $3 and $4, depending on package and Alltronics is closer to Sellam. I have bought from TubesAndMore to get hard to find tubes and they do a good job. I have a list of other tube sources since I also play with old radios. Dwight

22 years, 1 month

Osborne 1 Video Adaptor? (was:RE: IBM 026 Printing Card Punch)

by Robert_Feldman＠jdedwards.com

I was looking through the Alltronics listings and noticed a TTL-Composite video adaptor (http://www.alltronics.com/computer_miscellaneous.htm , #92C024) that looks like the adaptor I have for my Osborne 1! -----Original Message----- From: Dwight K. Elvey [mailto:dwightk.elvey@amd.com] Sent: Wednesday, May 29, 2002 1:18 PM To: cctalk(a)classiccmp.org Subject: Re: IBM 026 Printing Card Punch Hi Sam Check: http://www.alltronics.com/tubes3.htm Later Dwight <snip>

22 years, 1 month

IBM 026 Printing Card Punch

by dwightk.elvey＠amd.com

Hi Sam Check: http://www.alltronics.com/tubes3.htm Later Dwight >From: "Sellam Ismail" <foo(a)siconic.com> > >On Tue, 28 May 2002, Tothwolf wrote: > >> Is tube no. 6 missing or just optional? > >Missing, which is probably why the keyboard doesn't work. According to >John L. it's a common tube (25L6) so I'm going out to look for a >replacement today. > >Sellam Ismail Vintage Computer Festival >------------------------------------------------------------------------------ >International Man of Intrigue and Danger http://www.vintage.org > > * Old computing resources for business and academia at www.VintageTech.com * > >

22 years, 1 month

Remex Paper Tape Unit

by dwightk.elvey＠amd.com

Hi It is really quite simple to use the bi-directional printer port if your machine supports it. This is what I did with an old Intel one I have ( I think it was made by REMEX ). It is just wires and some simple software. Dwight >From: "Loboyko Steve" <sloboyko(a)yahoo.com> > >I've designed a very simple Remex paper tape reader >"parallel" interface to serial board utilizing a >PIC/Ubicom and a MAX-232 chip. Someone else on this >has one but I forget who, so: > >http://sloboyko.home.mindspring.com/remex.htm

22 years, 1 month

Baud rate of OPA0 on Microvax 3100

by bob_lafleur＠technologist.com

Does anyone know the baud rate of OPA0 on the MicroVAX 3100?

22 years, 1 month

PDP-11/VAX stuff for rescue (Mexico City)

by mrbill＠mrbill.net

Please contact Carlos directly if you wish to help rescue some of a massive pile of PDP and VAX parts and documentation (he mentioned in another email, of having 80 (eighty) RP06 disk packs...). I forwarded this with his permission. Bill - - - - - - - ( From: "carlos andres meymar l." <cmeymar(a)hotmail.com> ) My name is Carlos Meymar I had a company here in Mexico City called MIPROCESADORES S.A. that during several years sold and gave maintenance to PDP and VAX systems, as a result of this activities I have a lot of original DEC material including boards, cables, documentation and so on, I am moving my office to other location that is smaller and have to reduce my inventory. Do you know anyone in Mexico or in the U.S. that can be intereted in this material. I am in a hurry with the relocation of the office so please consider this as an urgent matter because otherwise I will have to give everything away as scrap material. Hoping to hear from you or anyone interested as soon as possible Best Regards CARLOS MEYMAR

22 years, 1 month

Forcing RJ11/12 plug into MMJ jack

by bob_lafleur＠technologist.com

Can I "force" an RJ11/12 cable into an MMJ jack? I thought I had an MMJ cable, but I don't. I've got a 4-wire cable from an LK201 keyboard that I can snap into the MMJ, but it doesn't fill the whole thing, so I assume only 4 wires will make contact, which I doubt will work. If I take a regular phone cord, break off the tab, and file the top smooth, will it fit in the MMJ socket? - Bob

22 years, 1 month

Commodore 128 newbie question

by csmith＠amdocs.com

> -----Original Message----- > From: Chad Fernandez [mailto:fernande@internet1.net] > Since I don't even know if this machine works yet, can I hook > it up to a > TV instead of a monitor? I'd hate to go buy another monitor from > Goodwill only to find that the computer doesn't work. Mine works with a TV. Also for the most part completely replaces the commodore 64 setup, which is nice since it's not nearly as ugly ;) Chris Christopher Smith, Perl Developer Amdocs - Champaign, IL /usr/bin/perl -e ' print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n"); '

22 years, 1 month

SYM-1 power connector?

by dwightk.elvey＠amd.com

Hi Dan The power connector you need is the 12 pin one at the center. I was wrong about the 44 pins. The 44 pin ones are for expansion. Here is a list of the connectors: EXPANSION (E) 1 SYNC A AB0 2 RDY B AB1 3 01 C AB2 4 IRQ\ D AB3 5 RO E AB4 6 NMI\ F AB5 7 RES\ H AB6 8 DB7 J AB7 9 DB6 K AB8 10 DB5 L AB9 11 DB4 M AB10 12 DB3 N AB11 13 DB2 P AB12 14 DB1 R AB13 15 DB0 S AB14 16 18\ T AB15 17 DBOUT(1) U 02 18 POR\ V R/W 19 -- W R/W\ 20 -- X AUD TEST 21 +5V Y 02\ 22 GND Z RAM-R/W APPLICATION (A) 1 GND A +5V 2 APA3 B 00\ 3 APA2 C 04\ 4 APA1 D 08\ 5 APA4 E 0C\ 6 APA5 F 10\ 7 APA6 H 14\ 8 APA7 J 1C\ 9 APB0 K 18\ 10 APB1 L AUDIO IN 11 APB2 M AUDIO OUT(LO) 12 APB3 N RCN-1 (1) 13 APB4 P AUDIO OUT(HI) 14 APA0 R TTY KB RTN+ 15 APB7 S TTY PTR+ 16 ABB5 T TTY KB RTN- 17 KB ROW 0 U TTY PTR- 18 KB COL F V KB ROW 3 19 KB COL B W KB COL G 20 KB COL E X KB ROW 2 21 KB COL A Y KB COL C 22 KB COL D Z KB ROW 1 AUXILIARY APPLICATION (AA) 1 GND A +5V 2 -VN B +VP 3 2 PA 1 C 2 PA 2 4 2 CA 2 D 2 PA 0 5 2 CB 2 E 2 CA 1 6 2 PB 7 F 2 CB 2 7 2 PB 5 H 2 PB 6 8 2 PB 3 J 2 PB 4 9 2 PB 1 K 2 PB 2 10 2 PA 7 L 2 PB 0 11 2 PA 5 M 2 PA 6 12 2 PA 3 N 2 PA 4 13 RES P 3 CA 1 13 3 CB 1 R SCOPE 15 3 CB 2 S 3 PB 3 16 3 PB 0 T 3 PB 1 17 3 PA 6 U 3 PA 7 18 3 PA 3 V 3 PA 0 19 3 PS 4 W 3 PA 1 20 3 PA 5 X 3 PA 2 21 3 PB 5(B) Y 3 PB 4(B) 22 3 PB 7(B) Z 3 PB 6(B) POWER (P) 1 +5V A +VP 2 GND B GND 3 +5V C +5V 4 GND D GND 5 +5V E -VN 6 GND F GND TERMINAL (T) 1 GND 2 RS-232 IN 3 RS-232 OUT 4 -- 5 +5V 6 +5V 7 GND 8 +5V 9 TTY KEYBOARD IN+ 10 TTY KEYBOARD IN- 11 TTY PRINTER OUT- 12 TTY PRINTER OUT+ 13 -- 14 AUDIO REMOTE NPN HI 15 AUDIO REMOTE NPN LO 16 AUDIO REMOTE PNP LO 17 AUDIO REMOTE PNP HI 18 AUDIO IN 19 AUDIO GND 20 -- 21 AUDIO OUT (HI) 22 -- 23 AUDIO OUT (LO) 24 -- 25 AUDIO GND KEYBOARD 1 +5V 2 +5V 3 +5V 4 +5V 5 +VP 6 +VP 7 -VN 8 -VN 9 GND 10 GND 11 GND 12 GND 13 RS-232 IN 14 RS-232 OUT The RAM sockets can be filled with 2114's. I think Jameco still has these. The RS-232 will drive +5 to 0 if the other end will take it, otherwise, you'll need a -12V connected to the -VN pins. You then change the jumper GG to 40. Data for the basic ROM's and parts of manual can be had at: http://highgate.comm.sfu.ca/~rcini/classiccmp/my_docs.htm If you need other things, let me know. Dwight >From: "Dan Veeneman" <dan(a)ekoan.com> > >At 06:36 PM 5/28/02 -0700, you wrote: >> Also, check to see if you need to have the BASIC ROM's. These >>boards normally only came with the monitor ROM and minimum >>RAM. One usually added the parts for the serial as well ( some >>transistors and resistors ). > >Looks like I need to add some parts. I've put up some pictures of >the SYM-1 at > > http://www.decodesystems.com/sym-1.html > >The board appears to be minimally populated. Besides the power >connector, specifications and instructions for adding the BASIC ROMs >and the serial interface would be appreciated. Thanks! > > >Cheers, > >Dan >www.decodesystems.com/wanted.html > >

22 years, 1 month

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test-drb May 2002