test-drb January 2002

test-drb@ccmp.vtda.org

303 participants
1201 discussions

by pete＠dunnington.u-net.com

On Jan 9, 2:11, Pete Turnbull wrote: > 10 and the #1 Control A board in slot 17. The #0 controllers handle the ^^^ That should be "B". That's what I get for using cut'n'paste too quickly :-( -- Pete Peter Turnbull Network Manager University of York

22 years, 11 months

Jumper settings needed for Heath H-27 disk controller

by Gary.Messick＠itt.com

Ethan, I'm pretty sure I have a copy of the H-27 manual(s). Do you still need them? What exactly are you looking for? Gary > -----Original Message----- > From: Ethan Dicks [mailto:erd_6502@yahoo.com] > Sent: Saturday, December 29, 2001 7:01 PM > To: classiccmp(a)classiccmp.org > Subject: Jumper settings needed for Heath H-27 disk controller > > > > As I've mentioned before, I have a Heathkit H-11 with > standard Heathkit > disk controller. The disk controller locks up the CPU if > it's in place > in the interrupt chain (it will begin the boot process if it's behind > all the cards with a gap in the grant chain, but after > loading the boot > sector and turning on interrupts, the OS, naturally, won't run). > > So... I have tested all the TTL chips in a chip tester. What I can't > test are the 88xx bus chips. From tracing the grant pins, I think > the 8837 is what hangs off the interrupt lines. I have finally found > some (unsoldered) loose replacements. What I still lack are > schematics > or at least a jumper map. > > The jumpers have been soldered and cut and resoldered before > I received > the card. As a result, I have no idea what they are supposed > to be set > at. Does anyone know the state of the jumpers for default operation? > > Thanks, > > -ethan > > > __________________________________________________ > Do You Yahoo!? > Send your FREE holiday greetings online! > http://greetings.yahoo.com > ************************************ If this email is not intended for you, or you are not responsible for the delivery of this message to the addressee, please note that this message may contain ITT Privileged/Proprietary Information. In such a case, you may not copy or deliver this message to anyone. You should destroy this message and kindly notify the sender by reply email. Information contained in this message that does not relate to the business of ITT is neither endorsed by nor attributable to ITT. ************************************

22 years, 11 months

Ceramic capacitor question

by Adrian.Graham＠corporatemicrosystems.com

Another question from me :) The Compukit UK101 has several ceramic capacitors, all marked 104Z 25V, which judging by what I've found on the web so far makes them .1uF. My local Maplins (sorry, that seems to be a swear word in some parts) only has 224Z at 25V (I'd guess .2uF?) and 104Z at 50V, half the size. What can I get away with? Or am I right in assuming I need to match exactly? Ta for any help.... -- Adrian Graham, Corporate Microsystems Ltd e: adrian.graham(a)corporatemicrosystems.com w: www.corporatemicrosystems.com w2: www.binarydinosaurs.co.uk (Online Computer Museum)

22 years, 11 months

Back to board washing for a moment

by Adrian.Graham＠corporatemicrosystems.com

Having read all the threads relating to board washing I've got a question. What are the panel's thoughts on video boards? I'm thinking of flyback transformers and the like......got a PET 8032SK here that I'm picking up on fixing again after a couple of months layoff - it's taken up smoking...... Anyway; it's been turned off since early november time, and since the board has a thick layer of greasy grime all over it I want to give it a wash since I can't see where the smoke's coming from apart from 'close to the front at the right'..... Any help appreciated -- Adrian Graham, Corporate Microsystems Ltd e: adrian.graham(a)corporatemicrosystems.com w: www.corporatemicrosystems.com w2: www.binarydinosaurs.co.uk (Online Computer Museum)

22 years, 11 months

CCITT G4 compression in WIN98

by djg＠drs-esg.com

>> It turns out that Windows comes with a program that >> does CCITT Group 3 and 4 compression. >well what was it! > Since I didn't see the author answer, I think is is the windows imaging program. Also called wang imaging and kodak imaging in various versions. Start->programs->accessories->imaging Use menu page->convert->compresssion and select CCITT Group 2(2d) Fax. I think this choice moves around some in the menu structure for the various options. You can also make that the default for scans under another menu. Didn't work properly with my sheet feeder though. Can do simple cleanup on the scans. Very fast for displaying and paging through the tiff files and doesn't have the display artifacts that Adobe PDF viewer sometimes has. (Select menu option view->scale to grey for best display quality). David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights.

22 years, 11 months

TCP programming question

by fmc＠reanimators.org

"Kevin Murrell" <kevin(a)xpuppy.freeserve.co.uk> wrote: > http://www.faqs.org/rfcs/rfc318.html > > ... is a good start for all things telnet! But keep in mind that it is obsolete. RFC 854 and 855 are the current standards for the basic Telnet protocol. -Frank McConnell

22 years, 11 months

TCP programming question

by fmc＠reanimators.org

"Cini, Richard" <RCini(a)congressfinancial.com> wrote: > Does anyone know if there is CR/LF translation across the telnet > channel? For example, if I hit <ENTER> in the telnet client, does that > produce <CR> or <CR><LF>? Is it dependent on the client settings? The simple > Windows telnet client provides only VT52 and VT100 emulation. This is one of those things that is poorly understood and apt to be implemented incorrectly and/or differently by different people. Telnet tries to provide a "network virtual terminal" abstraction, and one of the bits of that abstraction is encoding a "newline" across the Telnet connection. This was important way back when a terminal or host might send CR, LF, CR LF, or some other character sequence to indicate newline; and there was some thought being given to how to make it so you could use any terminal+host as a network virtual terminal to another host. The Telnet RFC provides two encodings: CR NUL and CR LF. When I worked on WIN/TCP for MPE/V I tried to make the Telnet server use CR NUL to mean "return the carriage to the left margin" and CR LF to mean "return the carriage to the left margin and advance to the next line" (there were MPE FWRITE carriage-controls that needed to be mapped to these). What I can't remember right now is whether that worked or whether I later changed the server to send CR NUL LF in some cases to appease clients that turned CR LF back into "return the carriage to the left margin". If a Telnet negotiates binary mode (sends IAC WILL BINARY and receives IAC DO BINARY) then it is saying that it will send raw 8-bit data and not do this NVT stuff. And of course some Telnet clients just do whatever, so just send CR when the user presses RETURN or ENTER. This is Wrong, but "be liberal in what you accept", so what you need to do for the NVT (non-binary) case is to run received data through a state machine: when you receive CR you enter a state for the next character where a NUL or LF is discarded but other characters are treated as received data. -Frank McConnell

22 years, 11 months

QBus IDE Controller

by doc＠mdrconsult.com

Most of y'all have probably seen this thread, but considering the rarity & price of medium/high capacity storage controllers, I thought this worth posting. There's a thread ongoing on alt.sys.pdp11 about a working QBus IDE adapter. The designer has a working prototype, 2.11BSD drivers, and a NetBSD driver in progress. He's asking for input as to interest in developing & producing these, and has docs, schematics, and I think drivers up at: http://www.chd.dyndns.org/qbus_ide/ Doc

22 years, 11 months

Mini-Mini computer scans

by dhquebbeman＠theestopinalgroup.com

> > Actually, these jpegs are great. I wish more scanned documents were made > > available in this format. Once I have my equipment set back up, I'll set > > about processing them with OCR software. The author's block printing > > should OCR well since his handwriting is very good. Once I have them OCR'd > > I'll work on converting them to postscript. > > JPEG is a lossy imaging format. You lose detail with this format. > Use something else! In theory, correct... but knowing in advance just exactly *how* and *why* it's lossy, using it for black and white text works just fine. Regards, -dq

22 years, 11 months

More off-topic drivel: Re: Language and English

by pete＠dunnington.u-net.com

On Jan 4, 19:34, Sean 'Captain Napalm' Conner wrote: > A Plan for the Improvement of English Spelling > by Mark Twain It is wonderful, although it's not by Mark Twain, but by M.J. Shields in a letter to The Economist. It was in response to George Bernard Shaw's suggestions to reform the English alphabet by adding 14 letters to eliminate spelling anomalies. Another wonder in the same vein is to be found at http://www.d.kth.se/~d92-abj/humor/spelling_reform.html. It concludes: Kontinuing cis proses, ier after ier, we would eventuali hav a reali sensibl writen langug. By 1975, wi ventyur tu sei, cer wud bi no mor uv ces teribli trublsum difikultis, wic no tu leters usd to indikeit ce seim nois, and laikwais no tui noises riten wic ce seim leter. Even Mr. Yaw, wi beliv, wud be hapi in ce nog cat his drims fainali keim tru. -- Pete Peter Turnbull Network Manager University of York

22 years, 11 months

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test-drb January 2002