test-drb August 2005

test-drb@ccmp.vtda.org

227 participants
528 discussions

by aek＠bitsavers.org

> Does anyone recognize this card? probably MIL-1553B (1mbit network used in aircraft) Any vendor? Huntsville Microsystems made interfaces. Try googling for "1553B unibus" Haven't had to deal with that stuff in 25 years. Please check if the multifunction board (M7096) in the /44 for boot proms that aren't on Jay's M9312 page. The card looks like this: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5796306354 PN 23-E39A9 and 23-E22A9 are needed.

19 years, 4 months

DECassette questions 2

by rigdonj＠cfl.rr.com

PS Does anyone have any docs on this item or know what interface card it requires? I'm also looking for pinouts, etc in order to make an interface cable. Joe I picked one of these up a while back and stumbled across it yesterday. It's a model TU80 IIRC. Does anyone have anyexperience with them? I've never seen or heard of one in actual use but I know it's supposed to be useable on the PDP-8 so I may try to hand it on my -8 if they're any good (and I can find the right interface card). What kind of cassette tapes do they use and how hard are they to find and format? Joe

19 years, 4 months

TR: pb to find the NEC FIP16A5R datasheet

by bepain＠madwaves.com

Hi Tony, You could find the NEC FIP16A5R datasheet for this component?. If yes, please can you send by e-mail this datasheet. Also I will like to buy 2 or 3 FIP16A5R. Can you tell me where I can find this one?. Best regards, Brice. Subject: Re: Newbrain Display From: ard(-at-)p850ug1.demon.co.uk (Tony Duell) Id:<m1CvlRS-000JEXC at p850ug1> Date: Mon, 31 Jan 2005 23:58:48 +0000 (GMT) > > Near to the Nec FIP display in the Newbrain computer there is a little > circuit with a componet with 10 pins where you can read: > > 27 > CD-1867N > TDK > JAPAN I haev the official Newbrain scheamtics here.... That component is probably a transformer. The module it's part of is a DC-DC converter to run the display. It has, apparently, 7 connections : 1) +5V input 2, 5) linked together, seem to be a -ve output (22uF to ground 3) Output,also -ve (22uF togoround, also goes to Vbb on the DS8881, and the pull-downs on the segment (anode) leads) 4,6 ) Heater outputs to the display > > Somebody know what is this component? I think it is used to control voltage > supplied to de display. > > Somebody have the NEC FIP16A5R datasheet? It is the 16 character display in > the Newbrain AD I can at least tell you : Heater : 1,37 Grids (digit select) : 3,5,7,9,14,16,18,20,22,24,27,29,31,33,35 Anodes (segments) : 4,6,8,10,13,15,17,21,23,25,28,30,32,34 -tony

19 years, 4 months

pb to find the NEC FIP16A5R datasheet

by bepain＠madwaves.com

19 years, 4 months

More memory board problems

by ajp166＠bellatlantic.net

> >Subject: RE: More memory board problems > From: "Cini, Richard" <Richard.Cini at wachovia.com> > Date: Thu, 25 Aug 2005 10:59:32 -0400 > To: "'General Discussion: On-Topic and Off-Topic Posts'" > <cctalk at classiccmp.org> > >All I can say is thank goodness for emulators. My kingdom for a stable >memory board... > Try a Compupro Ram16 or 17 or any of the other 64k on one board using 2116 type memory. Then terminate the bus, you just have to. Speed is not an issue and for altair backplanes ususally faster is a source of pain though a good terminator board will really help. Allison

19 years, 4 months

More memory board problems

by ajp166＠bellatlantic.net

> >Subject: Re: More memory board problems > From: John Foust <jfoust at threedee.com> > Date: Thu, 25 Aug 2005 09:39:36 -0500 > To: <cctalk at classiccmp.org> > >At 08:52 PM 8/24/2005, Richard A. Cini wrote: >>I have to say that I'm nearly ready to throw this 8800b through a window. > >Altogether a truly classic experience with the Altairs and IMSAIs, >as I recall. :-) > >- John Exactly why I have and Altair8800 and went to a NS*, I wanted to compute not constantly troubleshoot. The altair was PITA! Allison

19 years, 4 months

More memory board problems

by Richard.Cini＠wachovia.com

All I can say is thank goodness for emulators. My kingdom for a stable memory board... -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of John Foust Sent: Thursday, August 25, 2005 10:40 AM To: cctalk at classiccmp.org Subject: Re: More memory board problems At 08:52 PM 8/24/2005, Richard A. Cini wrote: >I have to say that I'm nearly ready to throw this 8800b through a window. Altogether a truly classic experience with the Altairs and IMSAIs, as I recall. :-) - John

19 years, 4 months

More memory board problems

by rcini＠optonline.net

All: I have to say that I'm nearly ready to throw this 8800b through a window. I purchased, yet again, another memory board in an effort to nail-down some stable memory for this system and reach 48k with the fewest boards possible. I've got the system booting BASIC with 16k, but I want more. This board is a 64k Central Data Systems DRAM card. I confirmed that it was strapped properly for an 8080-based system (sets refresh rate, etc.). This time I get problem I've never seen before. On RESET, the data LEDs show 0xff. If you toggle a value and DEPOSIT it, it will usually store but the LEDs will still show 0xff. If you EXAMINE the location, it will show the right value. Any ideas? I'm going back to swapping boards around again. 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, 4 months

IBM Convertible 5140 saga

by kittstr＠earthlink.net

I just received a IBM Convertible 5140 in what looks like great condition. It even had the little "cardboard floppies" in the drives. It didn't come with any disks, so I downloaded the starter disk from ibm's ftp site. When I try to boot the computer I get the message 'Disk Boot Error' I tried 3 different startup floppies (all made with the thing I downloaded from ibm) and then I even tried an old ms dos 5 disk I had lying around. Then I cleaned the disk heads and tried everything all over again. (3 fresh floppies and the old dos disk) Still no results, So I googled up disassembly instructions and switched drive A with drive B, Then I repeated as above. Still 'Disk Boot Failure'. Does any one know what else I should try? Does any one have any extra known working drives sitting around? Thanks in advance for any help anyone can provide. Andrew Strouse ( kittstr at earthlink.net )

19 years, 4 months

Fwd: pdp8 virtual memory disk system -pick up free, or will be junked!

by aek＠bitsavers.org

Begin forwarded message: > From: Patrick Jankowiak <recycler at swbell.net> > Date: August 23, 2005 7:25:57 PM PDT > To: General at robot.net, Discussion at robot.net:On-Topic and Off-Topic > Posts <cctalk at classiccmp.org> > Cc: Al Kossow <aek at spies.com> > Subject: pdp8 virtual memory disk system -pick up free, or will be > junked! > > I hate to do this but someone please come get this, there is no space > and it will have to be scrapped if not rescued. It's for a pdp8i and > gives you about 700K more "RAM" memory on top of the 4 or 8K of core > you already have. > > This has to go this weekend or next at the latest, time is of the > utmost! > > Please follow the link and see > > "1969 BSL model 7118 Disk-Based Core Memory Expansion for pdp8 " > > http://rawfire.torche.com/~opcom/ > > contact 214-763-4764 > > thanks, > Patrick > Dallas Texas >

19 years, 4 months

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test-drb August 2005