test-drb July 2002

test-drb@ccmp.vtda.org

202 participants
380 discussions

by pat＠purdueriots.com

I've 'rescued' a stack of HM6116LP-3 SRAM's from a circuit board. Apart >from the fact that they're 2Kx8 SRAM's, I haven't been able to find any useful datasheets with both pinouts and timing diagrams for the chips. By any chance, does anyone have one laying around in PDF or that they'd be willing to scan? Minimally, I'd like to know the pinout, basic timing requirements, max clock speed, and data retention voltage. I've also removed an Intel P8291A, which has been just as hard to find information on, anything would be useful. Thanks! -- Pat

23 years, 1 month

Mark-8 *Faints*

by groovelists＠yahoo.com

'Evening all! :) I don't quite know what to say... I suppose I just wanted to tell some people. I'd purchased a computer on ebay listed as, "another VERY EARLY HOMEBREW COMPUTER," a while back for $9.00. It didn't come in a bit over a month... I contacted the owner and waited some more, but had pretty much given up hope on it. It arrived today... I peered about inside... It appears to be a Mark-8. Has at least the same CPU board... I came very close to thumping onto the floor... It has a homebuilt case... it's about sewing machine sized. It has 8 ports of some type, a tape port, a control port. Inside, it has the CPU board, some input type board, some output type board, a board labelled add, and 2 1011 1k memory cards, all attached to a homemade bus. I know it is missing at least a 74xx something chip and the power supply, but... I'll put up pictures of it sometime in the next day or two. Thanks for hearing me rant! :) Oh yes! Thanks, too, to the kindly people who helped me out with the AT&T 3B1 - your help was so very appreciated! :) Andy ___________________ grooveman(a)yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com

23 years, 1 month

Laserjet IIIp in Ohio

by paulrsm＠buckeye-express.com

Someone was asking about paper trays for a LaserJet IIIp in Ohio. I have a half-dozen broken LaserJet IIp's and one IIIp for parts, including the paper trays. I live just north of Toledo. Contact me if you still need it. -- Paul R. Santa-Maria Monroe, Michigan USA

23 years, 1 month

[CCTECH]PDP11/23 and Emulex Qbus Controller

by Andreas.Freiherr＠Vishay.com

Pierre, maybe someone else will provide practical experience with the combination QD32 & 11/23, but my first guess would be that bandwidth is not a problem: as long as all devices on the bus obey all the bus specifications, they should be compatible. Was your friend possibly talking about address width (in other words, the number of address lines on the bus)? - There are three variants, with 16, 18, or 22 address lines. Incompatibilities can arise if a *DMA controller* drives *less* address bits than the system actually uses. Non-DMA controllers have no problem because they never address memory themselves. A typical problem of this type is the RXV211 (RX02 floppy disk controller: DMA, 18 address bits) used in a 22 bit system. The problem can be circumvented in driver software by reserving a buffer area in the lower 256kB of main memory. IIRC, older versions of the 11/23 drive 18 address lines, making them capable of using up to 256kB (or 128kW) of memory. Later models (in particular, the 11/23-PLUS) supply all 22 possible address lines, allowing for up to 4MB (2MW) of RAM. I was told several years ago that some /23s can be upgraded by adding a couple of wires (and maybe a handful of bus drivers). The QD32 is no doubt a DMA controller, but I think I know it is 22 bit. Hence, it should be possible to use this controller in any Qbus system. Also IIRC, the QD32 uses MSCP to communicate with its driver software, so it should not even require any special software: a vanilla DU driver would be OK for RT-11 or RSX-11, for example. Anyone have better information to correct me? Regards, Andreas P.Gebhardt(a)gmx.de wrote: > Hello, > > is it possible to use an EMulex QD32 Controller (Qbus) with a PDP11/23 ? > I asked a friend and he told me that the bandwith of the bus could be > drifferent. > Is it right ? > > Greetings > > Pierre -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com _______________________________________________ cctech mailing list cctech(a)classiccmp.org http://www.classiccmp.org/mailman/listinfo/cctech

23 years, 1 month

Peek65 magazine, March, 1985

by Lee.Davison＠merlincommunications.com

Does anyone have a copy of this magazine or know where such can be found? Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ 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

help needed: problem with UNIBUS access on my PDP-11/70

by GOOI＠oce.nl

Hi Eric. Yes, very strange indeed. The G7273 is placed in slot positions C & D, the correct way. Edward suggested to use the Ohmmeter and check for a very fine disconnect on the etch of the G7273. The etched wire is indeed quite thin, I remember from yesterday. We'll see this evening ... - Henk. > -----Original Message----- > From: Eric Smith [mailto:eric@brouhaha.com] > Sent: dinsdag 16 juli 2002 10:43 > To: cctalk(a)classiccmp.org > Subject: RE: help needed: problem with UNIBUS access on my PDP-11/70 > > > However ... (I will check this again) > > RX11 in slot 41 --> hung and we know why. > > RX211 in slot 41 --> all OK and we know why. > > G7273 double grant in slot 41 --> THE HUNG IS BACK! Huh?? > > Very strange. You've got the G7273 in the right slots (C&D)? And > not upside-down? If it's inserted correctly, it can't help but pass > the grants through!

23 years, 1 month

"modern" CP/M system?

by archer＠topnow.com

Hi, I noted off a link on this list that somebody had implemented a "modern" CP/M SBC based on the Z180 CPU. This, unfortunately, is no longer being made. With the rise of retrocomputing (The new IMSAI and the upcoming Commodore C=1 come to mind), I was wondering if anybody knew of at least a PCB solution with a ready-made CP/M port? Also, are there any good "CP/M internals" books I should be looking out for in the used bookshops? Preferably with enough detail to understand what's needed to do a port? P.S.: I'd love to see CP/M running at 20+ Mhz. :) -- Ross

23 years, 1 month

NPR and the RX11 (was Re: help needed: problem with UNIBUS access on my PDP-11/70)

by mbg＠TheWorld.com

The RX11 isn't DMA... when you give a command, it reads to a silo which the driver has to dump, a character at a time, or writes the silo which has been written, a character at a time... I just checked the RT-11 RX01 driver source to confirm it... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: gentry at zk3.dec.com (work) | | Unix Support Engineering Group | mbg at world.std.com (home) | | Hewlett Packard | (s/ at /@/) | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

23 years, 1 month

OT: MECOS frequency device ?

by dwightk.elvey＠amd.com

Hi It might be some kind of bearing failure detection devise. The switches would be to select the frequency to listen at. In a large shop, with a lot of machines running ( like a printing press ), one needs something check each bearing to see if it about to fail. When a bearing is just starting to go bad, it growls. The frequencies mentioned are in the range one would expect for larger bearings. Dwight >From: "Lawrence Walker" <lgwalker(a)mts.net> > > No the LED is in the chassis. I started thinking it might be some sort of heart >device timer as the deceased former owner of the auctioned items was quite >elderly. I guess you could use it as a timer strobe. > >Lawrence > >> On Thu, 11 Jul 2002, Lawrence Walker wrote: >> >> > Likely way off topic, but I acquired some sort of frequency device in >> > an auction junk box. It's a well machined device made by MECOS, made >> > in W.Germant. It's about 2" square by 1/2" powered by a Li. battery >> > and has micro-switches labelled 3 hz, 7.8 hz, 14.0 hz and a small led >> > that flashes at the selected frequency. Anyone have any idea what it >> > might be ? >> > >> > A search turned up that MECOS makes Active Magnetic Bearings and >> > control boards and programs. >> >> Could this be some sort of timing device used for calibrating the speed of >> something? Is the led separate from the chassis? >> >> -Toth >> > > >lgwalker(a)mts.net >bigwalk_ca(a)yahoo.com >

23 years, 1 month

book finds

by carlos_murillo＠epm.net.co

I went to Bogota this weekend and found some good books, including: -VAX Architecture Reference Manual (1987) -Samuel Seely, Electron Tube Circuits, 2nd. Ed., McGraw-Hill (1958). This book is a gem. I saw it once at a library a long time ago and had been looking for it ever since. -A. Khinchin, A Course of Mathematical Analysis, translated from the 3rd. russian ed. and published by Hindustan Publishing Corp., Delhi, India. Not CC related but a real find. I paid less than $3 for all three books. Something to calm the collecting itch for a few days :-) . -------------------------------------------------------------- Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

23 years, 1 month

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test-drb July 2002