test-drb December 2002

test-drb@ccmp.vtda.org

250 participants
519 discussions

by fm.arnold＠gmx.net

Hi, >From: "Fred Flintstone" <iamvirtual(a)hotmail.com> >To: cctalk(a)classiccmp.org >Subject: Re: DEC LA36 Decwriter II >Date: Thu, 26 Dec 2002 13:43:54 -0900 >Reply-To: cctech(a)classiccmp.org > >I guess I should have been more specific :-) > >I have what appears to be an OEM LA36. The label on the front says 'Data >Terminal Mart'. On the back, there is a label from Digital which gives the >model number as LA36DP. The processor board inside is made by Datasouth >Computer Corporation (P/N 512000-2). There is an 8 DIPswitch located on the >board. I do not have any documentation for this particular model and thus, >I do not know what the settings should be on the switches. I do have user >docs for an older LA36, but it does not cover my particular model. > >I am looking for information on the LA36, specifically the 8 dip switches. Ok, you seem to have a third party controller in your LA36. Because DEC build a real heavey-duty construction for the LA36, and let it print only with 30 cps. many people and some companies thought it could do much better. The few companies mentioned before put to the market several replacement- controllers, making a LA36+ (mpnc) with a much better performnce, sometimes 150 or so cps, loadable fonts and/or pixel-graphics ect. The many people bought those controllers and integrated them into their LA36'es and DEC-Fieldservice didn't got tired of telling anyone that a terminal upgraded that way would certainley disintegrate into its atoms "whitin months"... (I've never seen this happen). These 3rd-party controllers would completeley replace the original DEC-made logic board that was attached to the innerside of the back-door, and was about just as big as that door itself. (mpnc = my personal naming convention) So the DEC printset won't help you much with this, you should find a manual of Datasouth, to get details on the dip-switches. (most likeley they set the baudrate, and the switch in the keyboard has maybe got some other function. > >What I am trying to accomplish is to get the terminal console working on my >PDP-11/10 (really it is a PDP-11/05) prior to getting my PDP-11/20 running. > That should be possible, 11/10+05 have only 20mA cuircuits. The 11/05 computer is always the active party (=supplying current to the loop) on both Tx and Rx. The baud-rate is made by a rather unstable pair of one-shot monostables. Use a osscilloscope to set the time of this to either 26 or 35,5 microseconds. You need 26 us for the selection of 150 (tap5) - 2400 (tap1) baud, or 35,5 us for 110 baud on tap5 of the swich. > >When I hook everything up, the SCL on the PDP-11/10 has the expected >voltages. When I connect it up to the LA36, the voltages are driven to near >0v. I think, thats normal, afterall when the terminal is idle, there will be no current flow. Put your multimeter into mA-mode, and put it in series into the loop. Use preferably a cheap passive arrow-meter, the cheaper it is, the better the measurement. Alternativeley, you can also put a led somewhere in the loop. create data-output, and see what happens >I am not sure I have things hooked up correctly, or if there is a >problem with the SCL. I used the docs I had for the older LA36 to connect >my LA36DP. The connections I made were from T+ on the PDP-11 to R+ on the >LA36 and T- on the PDP-11 to R- on the LA36. Seems ok to me. (long time ago...) (Beware however that the naming-conventions for ths 20mA current-loop were not always consistent. There is no industry standard for this. I dont know how Datsouth has named its connection-terminals) If all this is ok, still nothing will happen if the baud-rate is unmatched between 11/05 (rotary switch and trim-potentiometer on M7260) and probably dip-switch and/or Keyboard-button or keyboard sequence on the LA36+ >When the LA36 is not >connected, there is no voltage on the Transmit/Receive which I am presuming >means the LA36 is in passive mode. Ack. >Voltages are present on the Transmit/Receive on the PDP-11 side, >and I presume the SCL is in active mode. Ack. Hope you can solve this. Frank

21 years, 5 months

DEC 11/03 on eBay

by jpl15＠panix.com

An interesting 11/03 system, has twin DSD 8" drives, and some kind of DSD data acquisition card (A/D D/A???) dunno can't see enough detail in the pics. Seller seems to be rather.... well, 'scattered'.... ;} http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2084606280&category=4193 Cheers John

21 years, 5 months

Z8000-Fan

by cpg＠aladdin.de

On 12/27/2002 02:48:31 PM CET G?nter Mewes wrote: > >today I was looking for some Z8000 Fans, to talk about experieces ... >Are you interested ? Yes, I am. regards, chris

21 years, 5 months

Noise levels (was VAX 11/780)

by acme＠ao.net

From: John Lawson <jpl15(a)panix.com> To: Glen Goodwin <acme(a)ao.net> Subject: Re: VAX 11/780 anyone with some working experience out there? Date: 12/25/2002 4:47 PM > another, but no such luck... and I know plenty of folks who spent long > years working in big machine rooms... 90+ dB all the time... no thanks. Umm, 90+ dB? Can this be right?? That seems awfully loud. Is that typical for larger machines? Just one more thing to take into account before I seriously consider moving any larger equipment in here . . . Glen 0/0

21 years, 5 months

IBM 5161

by jingber＠ix.netcom.com

Does anyone have a description of what the "felt pad" for the IBM 5161 looked like, and did this item come from IBM/with the unit? See this thread for reference: http://www.classiccmp.org/mail-archive/classiccmp/1998-12/0378.html Thanks, Jeff

21 years, 5 months

Trying to make a connector for my Documation M200 card reader

by djg＠drs-esg.com

From: Sellam Ismail <foo(a)siconic.com> >So I guess I should open my reader up and find out which version it used >in order to determine how to wire up my connector to the 6522? > Probably best. On the parts page 12-31 the IC's with the multiple #'s are the ones that change between the versions (see the next page also).

21 years, 5 months

LA36 various responses

by alderney＠telusplanet.net

One person interested in 20 ma LA36's, and I think an answer in error from Don Maslin. Thanks for the information on the 20 ma question Kevin and Larry I'm not sure if these units are 20ma loop - but from their history I'd expect them all to be the same. The plug on the connecting cable is a DB25 female, and the wires go to pins 1 through 7. Models are; Datacom 400 (the one which may work), 2 Datacom 1200's, and 1 Decwriter III. Does the pin connection help with the 20ma question, or is there a simple test I can make on the lines? I'm not sure from Kevin Hardy's letter if one could just change the wiring - it sounds like it, but these may be OK already. I tried to see if I could tell what the output driver is (as per Larry's comment), but the board isn't very easy to see. There appears to be an output IC labelled 7550 - is this a valid TTL number? Don Woods Message: 3 >From: Barry Moyer <barry.moyer(a)pason.com> >To: "'cctalk(a)classiccmp.org'" <cctalk(a)classiccmp.org> >Subject: DEC LA36 >Date: Tue, 24 Dec 2002 09:08:19 -0700 >Reply-To: cctech(a)classiccmp.org > >Don, > >I am in Calgary and I have a newer LA36, but I am looking for another older >LA36 with a 20mA loop connection. You can contact me at 'iamvirtual at >hotmail dot com' (replace at with @, dot with .) > >Thanks > >Barry > ... > >Message: 9 >From: "Fred Flintstone" <iamvirtual(a)hotmail.com> >To: cctalk(a)classiccmp.org >Subject: Re: DEC LA36 units >Date: Tue, 24 Dec 2002 10:46:02 -0900 >Reply-To: cctech(a)classiccmp.org > >Don, > >I am currently looking for an older LA36 which has a 20mA connection (I need >it to connect to my ancient PDP-11s). Do you know the model numbers for the >LA36? > >Thanks. > >--Barry > >. > >Message: 15 >Date: Tue, 24 Dec 2002 15:59:09 -0800 (PST) >From: Don Maslin <donm(a)cts.com> >To: cctalk(a)classiccmp.org >Subject: Re: DEC LA36 units >Reply-To: cctech(a)classiccmp.org > >No Barry, sorry, but Dec printers are outside my area of knowledge. > > - don Message: 4 Date: Thu, 26 Dec 2002 09:39:19 -0700 From: Kevin Handy <kth(a)srv.net> To: cctalk(a)classiccmp.org Subject: Re: DEC LA36 Reply-To: cctech(a)classiccmp.org Barry Moyer wrote: >Don, > >I am in Calgary and I have a newer LA36, but I am looking for another older >LA36 with a 20mA loop connection. You can contact me at 'iamvirtual at >hotmail dot com' (replace at with @, dot with .) > > I believe that the 20ma current loop was available for all the LA36's. It was just a different cabling option, bit a 'new' or 'old' version thing. You could buy the 20ma current loop with your LA36, or later as an option to change an existing one from RS232 to 20ma. Message: 13 From: "Truthan,Larry" <truthanl(a)oclc.org> To: "'iamvirtual(a)hotmail.com'" <iamvirtual(a)hotmail.com> Cc: "'cctalk(a)classiccmp.org'" <cctalk(a)classiccmp.org> Subject: DEC LA36 Decwriter II Date: Thu, 26 Dec 2002 16:42:02 -0500 Reply-To: cctech(a)classiccmp.org I have the engineering prints in the LA 36 Decwriter II LA36 (MPC5) sheet 5 of 8 shows 20 ma RECIEVE on J3 pin 7(+) and Pin 3(-) bridged by a 3.3 volt zener D4 746A feeding a 4N26 (E43) opto-isolator which drives a MXAA05 (Q4) driver transitor which has its collector on J4 pin 2 "S.I." (serial in) 20 ma TRANSMIT is on J3 Pin 5(+) and Pin 2(-). These pins are bridged by a 1N4004 diode D6. This diode also is parallel to the emitter/collector of Q2, an A05. which is driven by another 4N26 opto-isolator (E47). S.O. is J4 pin 4. It is driven by a 7404 inverter (E62)-(Input is 7404 pin 3 connected to the diode cathode of the opto-isolator, output is 7404 pin 4, which connects directly to J4 pin 4, "S.O." serial out) Sincerely Larry Truthan

21 years, 5 months

Free MCA Card (possibly a Streaming Tape Adapter)

by ram_suganthi＠hotmail.com

Hi, I am sending this out again as I got no response. If I dont get one this time, out it goes. I have a MCA card that might be a streaming tape adapter (dont know as I dont have a MCA system). It is free for the taking (shipping charges do apply, unless you are willing to pick it up at 11553 Long Island)... Cheers, Ram _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 3 months FREE*. http://join.msn.com/?page=features/featuredemail&xAPID=42&PS=47575&PI=7324&… http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_addphotos_…

21 years, 5 months

New software acquisitions

by SUPRDAVE＠aol.com

Finding old computers at the second-hand stores is getting difficult now but I did goto one place and look through some software boxes they had. Lots of DOS based stuff and ... OS/2 ! I got: warp server IBM training book and VCR tape for 2.1 warp 4 with mic faxworks pro galactic civilizations still wrapped warp connect DB2 single user hyperaccess OS2 system sounds IBM attachpak for OS/2 I left behind warp red box but I'm glad I found it all. -- Antique Computer Virtual Museum www.nothingtodo.org

21 years, 5 months

Reward for SWTPC PR-40 printer

by Rick＠jelcoventures.com

I am looking for this pretty rare printer - a SWTPC PR-40. Am offering a $200 reward for information leading to a purchase. Rick Crandall rick(a)jelcoventures.com

21 years, 5 months

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test-drb December 2002