test-drb

test-drb@ccmp.vtda.org

101090 discussions

by julesrichardsonuk＠yahoo.co.uk

> hi, > >> (the chip in question is a ST9293J9B1/AEL for the record, > What is this TV model & brand? It's a Ferguson T7073SJD, using an ICC9 chassis. One website containing a faults database listed the failure of that chip giving the exact symptoms that I see (no sound when the set warms up and the remote operation goes unresponsive). I've pulled the main board and will re-solder all the joints in that area just to check; there's only one electrolytic as part of the circuitry surrounding that chip but I'll replace it with a known-good just in case. Tony's point about the crystal was interesting - I didn't think those things ever failed. I'll see if I've got a spare to try anyway. The set's awful inside - very cheaply made with little thought to cable runs, connectors, and how the various boards plug together. Guess they must have had different teams working on different sections and management for the overall project wasn't exactly what it should have been... (typical of more modern equipment unfortunately!) cheers Jules For a better Internet experience http://www.yahoo.co.uk/btoffer

23 years, 1 month

IBM 5161

by cb＠mythtech.net

>But in the XT, one slot is different. Why? -chris <http://www.mythtech.net>

23 years, 1 month

DF32x4 questions; software needed

by djg＠drs-esg.com

>From: Ethan Dicks <erd_6502(a)yahoo.com> >--- "Dr. Charles E. Morris" <c.morris(a)townsqr.com> wrote: >> registers... Ethan Dicks has pointed out that I should look at the >> drivers in OS8 and TSS8 to see if this will be a compatibility problem. >> http://www.ibiblio.org/pub/academic/computer-science/history/pdp-8/os8/os8.… ftp://ftp.dbit.com/pub/pdp8/tss8 >As I mentioned earlier, I've only done some basic DF32 twiddling >from a PDP-8/i to prove that the interface mostly worked (and to >diagnose my repairs of a smoked rotation sensor board). I've never >had the joy of an 8K machine + DF32s, so I've never had an OS to >explore them. > 4k and 1 DF32 is enough for Disk Monitor System. I built an image with the standard programs and put it at ftp://ftp.pdp8.net/software/dms/ The paper tapes images to build it and the manual are pointed to in the readme. It was installed for 8k since my 8/i is 8k but can be installed for 4k. I also have programs to dump and restore DF32 images over the console port. They aren't online yet since they need a little more cleanup but I can send you a copy. Let me know if you need any help. David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights.

23 years, 1 month

Thanks for the welcome

by tradde＠excite.com

Well, I am mainly into pdp-8 and pdp-11. Those were my first computers when in high school and college. But pdp-10s also interest me. Actually anything pdp related might get my interest. I have a pdp-8e, pdp-11/34a, and a pdp-11/84e. One day I hope to have a pdp-8i as that was the first computer I ever used. I am still working on getting all my systems fully operational. The 8e will have a dual rk05 drive connected to it. The 11/34a will have an RL02. I am not sure what the 11/84 will have as I have only had it a short while. Tim Radde >Well, let me be the frist so say "hello" & welcome aboard! Yes, >you'll >like this place, it can get intresting, some of the discussions get a >little off on a tangent, but aside from that, I've learned a whole >bunch of info I never would have known. _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web!

23 years, 1 month

Interesting 8/L problem (more than you want to know about switching transistors)

by charlesmorris＠direcway.com

I was sending blocks of data to and from my DF32x4 emulator when I noticed that Bit 5 was always writing a zero to the disk - turned out to be a bad bus driver (M623 in slot D28) and I found a short >from collector to emitter of the output switching transistor. After destroying the transistor removing it, I found out the clamping diode was the actual shorted part :^P so after replacing it with a 1N4148, I grabbed the nearest 2N3904 switching transistor and put it in. Guess what - Bit 5 still didn't work, although it was now changing states! To make a long story short, I found that the rise time of a 2N3904 is reasonably fast (around 50 nS) but the storage time in the circuit DEC used (a 7402 NOR gate driving the transistor base through 390 ohms) is on the order of 500 nS. (Once a bipolar transistor is turned on, there is a significant time required to extract the charges from the base so it will turn off, especially if a negative drive voltage is not available). Although the 7402 output waveform was square, this particular transistor base voltage was dropping much more slowly than any of the others; I could see on the scope that this made the BMB5 output change from 0 to +5 volts AFTER my disk circuit wrote the data into the NVRAM! Some research through the data books showed that a 2N5769, for example, would have been a much better replacement, with a storage time spec of 13 nS. Fortunately, after a little experimenting with "peaking" capacitors across the 390 ohm resistor, an 820 pF gave a sufficiently fast turn-on and turn-off with the 2N3904. So the object lesson here is that all switching transistors are not created equal, even in 1960's technology! Naturally since the DEC part numbers are no longer available, some thought is needed before just deciding on PNP or NPN... -Charles (Relearning long-dormant EE skills!)

23 years, 1 month

New Finds & question

by quapla＠xs4all.nl

Hello all, This morning I picked up some Dec stuff : 1x Alpha 400/166 + 1 Dec storage tower running Unix 1x Alpha 400/166 + 1 Dec storage tower running NT 1 Infotower/infoserver 1000 with 5 CD-Rom's 1 Vax 4000/100 With it came a box of cables, for which I have no idea where they can be used for. One of the cables is marked BC18D-02 and is about 50cm long, the other is a cable which has on one end a sort of high density connector and has a small block in the middle which forks into 4 D25 connectors. The vax 4000 has the female connectors at the back, am I right if these cables are for terminals? Thanks, Ed -- The Wanderer | Politici zijn onbetrouwbaar quapla(a)xs4all.nl | Europarlementariers: zakkenvullers http://www.groenenberg.net | en neuspeuteraars. Unix Lives! M$ Windows is rommel! | Wie mij te na komt zal het weten. '97 TL1000S |

23 years, 1 month

Hello, I am new to this list

by tradde＠excite.com

I should have said Hello before my first post. I just found out about this list. It seems quite impressive and very useful. I know I will get much use from it. Hopefully I can answer a question ever now and then too. Tim Radde _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web!

23 years, 1 month

Available: Livingston PortMaster Internetwork Router.

by vaxzilla＠jarai.org

This was heading out towards the dumpster today, so I grabbed it. From what our network admin told me, this router is from the early 1990s. It looks like Livingston made several varieties of these plain gray boxes. The identifying markings on this one are very sparse, so I can't provide much in the way of info about /exactly/ which model this is. Dimensions are 3.2" x 16.8" x 11.5" and it weighs around 12 lbs. It has a DB-25F console/diag port. It has another DB-25F port that's switchable between RS-232 and V.35 (so, presumably, you could hook up a slower serial device or a T1/E1 device to this). And then it has a choice of RJ-45, BNC, or AUI ethernet port. The only identifying marking of note apart from the "PortMaster Internetwork Router" on the front is small label which reads "Model: IRX S/N: 1A13813". Some info related to the Livingston and their products can be found here: <http://portmasters.com/>. This one does power up and I was able to get a login prompt by connecting a terminal to the diag port with a null modem cable at 9600 8-N-1. The login and password are unknown. The condition of it is also unknown, though it's believed to have been working when it was taken out of service a number of years ago. Available to the first taker for US$2 + shipping to anywhere in the US or Canada from zip code 90232. It won't be until sometime next week that I'll have the time to pack, estimate shipping, and send this out. -brian.

23 years, 1 month

Soroc terminal/Northstar DOS wanted

by vcf＠siconic.com

See below and respond to the original sender. Reply-to: <paulmoadib(a)aol.com> ---------- Forwarded message ---------- Date: Fri, 4 Apr 2003 19:17:39 -0800 From: Philip Baily <paulmoadib(a)aol.com> To: vcf(a)siconic.com Subject: VCF Feedback! Do you know of anyone with a SOROC IQ 120 Terminal for sale? (I can offer $100.00+ for it if is in good working condition.) Also, I am looking for a copy of Northstar DOS / BASIC to run my NS Horizon computer. Do you know of anyone who might be able to help me get a copy? Many thanks, Phil Baily -- 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 *

23 years, 1 month

Need IRIS Antivirus software ($$$)

by vcf＠siconic.com

This is a follow-up to a message I posted on Monday. I am looking for some early (circa 1990) antivirus software made by a company called Iris (maybe spelled "iRiS"). This may have gone under the names of "Virus-Free", "Antivirus" and "Antivirus Plus" (sometimes in combination with the company name "IRIS"). The software was distributed by Iris and the software apparently written by Computers of Israel. The iRiS software was included in the system software that came with an Arche computer of the same vintage (1989-1990). It is the software that I am really after but the computer also has some use. If you tried contacting me about this but had your message bounce it was because I was moving my server around. Sorry. Please try again. I have posted bounties of $200 for the computer and $100 for the software. -- 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 *

23 years, 1 month

breathing life into old chips

by julesrichardsonuk＠yahoo.co.uk

hi, this is sort of off-topic as it applies to my TV and not a computer, but I bet some of the folks here can offer advice... :) the microcontroller in the set seems to have developed a fault which only appears when the set's warm. Tracking down a replacement seems to be easier said than done as the chip was obviously discontinued a while back (and then I'd have to worry about the on-board ROM anyway). At the moment though there's no heatsink on the chip - if I do stick a heatsink on it in the hope that it keeps it cool enough to operate, is it still likely to fail at a later date anyway? Once a chip's started to exhibit heat-related problems is that basically the end of it even if something's done about the cooling? I figure some of you people will likely know about these things :) (the chip in question is a ST9293J9B1/AEL for the record, but no infomation appears to exist on the web or on ST's site for it; wish I could get pin-outs to check that it is the chip and not surrounding circuitry that's failing) cheers! Jules For a better Internet experience http://www.yahoo.co.uk/btoffer

23 years, 1 month

Free (ish) tape drive & hard drive

by Lee.Davison＠merlincommunications.com

Further information .. The FACIT tape drive can be used an a PDP 11/34, see .. www.tno.nl/instit/fel/museum/computer/en/comp783E.html The AMPEX hard drive is 10MB, ST506 interface, full height 5.25" Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

23 years, 1 month

The Gospel according to ARD:

by jpl15＠panix.com

Tony Duell provides us with an exemplary indicator of the true collector: > >and give you a nasty (and possibly fatal) shock, or worse still do ^^^^^^^^^^^^^^ >serious damage to said classic computer. > Collectors are many; vintage computers, few! ;} Cheers John One-Hand-In-Back-Pocket-At-All-Times Lawson

23 years, 1 month

Cool calculator

by jrkeys＠concentric.net

I picked up a Compucorp 324G Scientist calculator/micro computer at a thrift today for $8.08. Seems to work great.

23 years, 1 month

H89 CP/M hard-secored boot diskette

by dwightk.elvey＠amd.com

>From: ard(a)p850ug1.demon.co.uk > >> MTR-90 is in the ROM on the 89's CPU board. My MTR-90 manual indicates > >[...] > >> It certainly seems as if you can run both controllers in one machine. > >You most certainly can. My Z90 (essentially the same machine -- AFAIK the >differences are that it came fully assembled ('Z', not 'H'), and came >with 64K RAM, has MTR-90, the hard sector controller and the >double-density soft sector controller. The former is cabled to the single >built-in drive, the latter to an external drive box. > >It will boot either HDOS or CP/M, and can use both types of disks > >-tony > The Z90 is built to be 64K a H89 isn't. As far as I recall, the H89 took more than a simple jumper or switch to make it CP/M compatable. Also, one should note that HDOS came in both hard and soft sectored. Dwight

23 years, 1 month

IBM 5161

by n8uhn＠yahoo.com

The ibm 5161 expansion box was designed for use with the ibm pc. the pc had fewer slots then the later released pc xt and it's power supply was too small to handle a hard drive. the exp box added a hard drive to the system and provided extra card slots ( i think the box also had additional bios or came with an extra fixed disk rom chip that went into the pc). the card that connects to the ribbon cables that come >from the exp box goes into one of the pc's card slots. i cannot remember if it is slot specific or if it can go into any slot - there is a plate on the pc's back that removes to allow the ribbon cables to exit the case. a local retired ibm ce had asked me years ago if i had ever seen one - as he was looking for one at the time. i was told that the expansion box was a little rare because, shortly after the pc was released that pc xt was released . the pc xt has a large enough power supply to support a hard drive as well as the bios to operate one and it has eight card slots. Bill Message: 44 From: "Witchy" <witchy(a)binarydinosaurs.co.uk> To: <cctech(a)classiccmp.org> Subject: IBM 5161 Date: Mon, 31 Mar 2003 20:25:09 +0100 Reply-To: cctech(a)classiccmp.org Hi collecting folks, A surprise consignment arrived for me this morning - an IBM 5150 in not bad condition complete with keyboard/monitor and a 5161 expansion box, spare expansion card and 2 extender cables.....reading the classiccmp archives back to 1998 makes me think I should be impressed since the 5161 isn't that common? It all apparently works but I won't be able to set it up fully till tomorrow. Not much info about it on the web either, though because 5161 is obviously bits of a phone number there's a very high signal to noise ratio..... cheers -- adrian/witchy www.binarydinosaurs.co.uk - the online computer museum www.snakebiteandblack.co.uk - monthly gothic shenanigans --__--__--

23 years, 1 month

Handheld Computer organizer available

by anheier＠owt.com

I have this cool little Psion Organizer II, model XP available. It's a 6800 processor powered handheld computer. I have the COM link cable and a 32K Datapak. It appears to be functional. It was made in the UK. Someone out there probably knows the history of this little device. Best offer, please send zip code for shipping costing and I prefer Paypal. Thanks Norm

23 years, 1 month

Free (ish) tape & hard drive

by Lee.Davison＠merlincommunications.com

I have surplus to requirements the following.. FACIT tape drive Model No. 4203 Prod. No. 9281 01 09 .. and .. AMPEX hard drive PYXIS 13 Part No. 3315422-01 Both are of unknown status having been stored in a garage for at least a decade and both show some signs of having been damp at some time (some corrosion). Both are heavy so will cost to post. Anyone interested in these please contact me off list. Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

23 years, 1 month

semi-OT: Power Computing 100 power supply

by cb＠mythtech.net

>I've got a Power Computing 100, one of the earliest Mac clones >(equivalent to Mac 8100/100, though the logic board is physically >different). It seems that its power supply has died. It is a Seasonic >SSH-200G. I'm pretty ignorant about PSU standards, so am not sure what >I need to look for in a replacement -- a friend said "it looks like an >AT power supply, but that little 4-pin plug [which connects to the >logic board, I think] is non-standard, so a standard AT PSU won't work >as a replacement." It also has two large 6-pin plugs that plug into the >motherboard as well. The rest of the plugs are standard 4-pin. If you find out any info, forward it on to me. I recently aquired one of those as well, and the power supply, along with every other cable in it, has had all the wires cut. It looks like someone either was fired and pissed off, so they took their revenge on the machine, or more likely (since the hard drive is missing as well), the machine was officially "decommissioned" and rendered to an unusable state to take it off the books. Before I go thru the effort of patching the leads together, if I can find a suitable, available replacement, I'll go that route for the purpose of testing it to see if the system has been damaged in other ways (then if it works, I'll go back and patch the power supply together, just because it will be fun). I did ask a Power Computing list if the Power100 used a standard AT power supply, and was told that it does not. However, the person that gave me the response spent no effort discussing how it differs, but did spend 3 paragraphs telling me not to waste my time with a Power100 and instead to buy a used PowerTower Pro. So that told me that they just didn't get it, and didn't understand the interest in reviving an old machine... which also makes me suspect the validity of their answer (not that failing to understand old computers equals a lack of knowledge of the power supply... just that it seemed more like an uninterested/uninformed wave off of the power supply question in the effort to push me to a newer faster machine). -chris <http://www.mythtech.net>

23 years, 1 month

DEC keyboard/mouse protocol

by erd_6502＠yahoo.com

Re: recent discussions Found this in section 14.38 of the VMS FAQ: http://h71000.www7.hp.com/wizard/faq/vmsfaq_016.html The protocol definition for the old DIGITAL keyboard and mouse interfaces is buried at the back of the QDSS section in the old VAXstation II manual, specifically, in the back of the VCB02 Video Subsystem Technical Manual (EK-104AA-TM). The keyboard wiring and protocol is in appendix B, and occupies circa 44 pages. The mouse is in appendix C, circa 12 pages. ... in case anyone wants to tackle a protocol converter. -ethan

23 years, 1 month

DF32x4 questions; software needed

by c.morris＠townsqr.com

My "DF32x4" disk emulator is alive and talking to my 8/L and appears to be reading and writing blocks of data correctly. There are a few instructions that I did not implement (e.g. the "Maintenance" IOT's 6631-4 which the manual says are only used in "diagnostic programming". Also the DCEA instruction does not clear the extended address and EA registers - it would have taken quite a bit more logic to implement and there was no more room on the PC board; additionally the DEAL instruction would be used anyway, which combines the clear action with a load of these registers from the AC - so the clear would be superfluous. The DEAL and DEAC load/read register commands are, of course, implemented). Ethan Dicks has pointed out that I should look at the drivers in OS8 and TSS8 to see if this will be a compatibility problem (i.e. they may expect to be able to clear EMA and EA for some reason, rather than loading them from the AC). Can anyone tell me where to find the source code so I can verify this? Also, I would love to have a paper tape copy of 4K Disk System Builder to start a build of Disk Monitor from scratch (I already have a copy of a DF32 build thanks to David Gesswein). Anyone? thanks Charles

23 years, 1 month

Ebka Familiarizor 6502

by Hans.Franke＠mch20.sbs.de

Now for something strange: Who of you has ever heared about a Ebka Industries Familiarizor 6502 I have just seen this little beast at ePay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1247&item=3409229078 Now, doing a quick search, nothing did show up, except a very short mentioning in Hans Pufals list. Any other info around? Gruss H. -- VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen http://www.vcfe.org/

23 years, 1 month

PDP-11/24 Available in Virginia

by timothy.p.radde＠lmco.com

Is this system still available? I am in Pennsylvania and might be interested.

23 years, 1 month

Ultrix Driver Question

by sridhar＠neurotica.com

Hi people. I assume that SDI disks show up as /dev/ra* on Ultrix? What do the SDI controllers show up as? Specifically, the XMI ones? Peace... Sridhar

23 years, 1 month

That pesky battery! (was: Re: semi-OT: Power Computing 100 power supply)

by mbates＠whoopis.com

Well okay then! I dug around in the pile of old Macs in the basement and found an identical 3.6v mb battery, which tested good...stuck that in there, plugged old PSU back in, and it boots! Hooray! Thanks for all the help, everyone! :) (Sorry Chris, guess I won't be getting parts to share with you now...good luck with your Power 100 repair project.) -- MB

23 years, 1 month

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb