test-drb March 2000

test-drb@ccmp.vtda.org

150 participants
515 discussions

by allisonp＠world.std.com

<> Or, wouldn't it work to just use a Q18 backplane which doesn't bus BDAL21 <> I would think that even the 11/73 CPU would be OK then, as long as you do <> mind living with 248 KB memory... < <Or maybe you could put the CPU/RAM/DMA peripherals in a Q22 backplane and <then link that to a Q18 backplay with the ADV11 card in it. If you like, <you could connect BDAL18-BDAL21 between Qbus In and Qbus Out on that <backplane, so that you could have more Q22 backplanes 'dowstream' of it. You can but the collective system will be the least of the two and not additive on items like address bus width. Likely that would have wraparound if enough memory or a non BBS7 compatable IO. If a bord is only Q16 or Q18 the options are mod it if possible for q22 or restrict the bus useage to the level of the least board. Allison

24 years, 9 months

PDP-11/23 deskside machine

by allisonp＠world.std.com

<I guess I must have just gotten lucky to get it to boot those two times. <This is what the machine does <most> of the time. < <KDF11B-BE ROM V0.9 < < 512KB MEMORY <9 STEP MEMORY TEST < STEP 1 2 ERR RAP <173714 <@ 173714 is the address at which the boot selftest program failed. not in ram as 173xxx, is the boot/room page. The count down is each specific test either you get a memeory test error something else. Assumeing the board and rom are ones I know a stop at that address means a NO was types on the terminal duriing console test! To be sure we'd need to know the board handle numbers and rom numbers. to gove that answer I assumed 11/23+ M8189 cpu card, but the message appears to be for an 11/23B cpu/rom set. My guess is you have a bum tube! Also don't apply PC troubleshooting rules to a PDP-11, you'll make youself nuts! <Does this mean that the ram card is bad at a given location? If so, there <is no reason I can't replace the ram on the card with a desoldering iron. <I would like to socketize the ram but I don't think there is enough room <between cards to make that happen so I'll have to solder them directly to <the board and pray I have no more failures. You can, it's possible, you have no clue yeat if it's bad ram. <Is the above 6digit number the location of the failed bit/byte of memory? No, it's a location in rom where the program failed. Allison

24 years, 9 months

teletype wanted.....

by pete＠dunnington.u-net.com

On Mar 23, 16:05, Cameron Kaiser wrote: > They're black, about the size of (spit) a Windows CE box, I guess. It folds > open to reveal a keyboard with red, orange and burgundy-ish keys, and then a > single row 40?-character LCD with a "summary of commands" below that (in > Dutch, not much good to me). Does this ring any bells? Hmm... not really -- it's not quite what I thought. Teletext and Viewdata normally use colour, chunky graphics (each character cell is divided into a 2 x 3 mosaic grid), and a 40 x 25 character screen. So either this is some really simple device, or that's just a status display: is there any socket anywhere that could be a video or TV connector? Serial connector? Any others? What's marked on the keys? > I'm particularly interested in figuring out how to talk to them *without* > having one unit on one end, like, say, have my workhorse C128 talk to them, > upload and download from them, etc. > > I'm confident the baud rate would be low enough for the Commodore to handle > a transfer, but I'm not sure if a regular modem and the Text Tell could even > communicate (using the same modulation, etc.) I'm afraid I don't know much > about telecom standards, so the V.23 note went over my head. :-( If it's European, it will use CCITT tones rather than Bell tones (I'm assuming it's simple FSK modulation). The V23 standard is rather like Bell 202 (V23 uses 2100/1300Hz and 202 uses 2200/1200Hz); half-duplex except that it has a modulated 75 baud back-channel, while Bell 202 has a 5 baud CW back-channel, a 387Hz tone keyed on and off for signalling. The answer tones are slightly different too. However, there's a small chance it might be V21, which is 300 baud full duplex. Again, though, CCITT V21 uses different tones to Bell 103. As an aside, when viewdata was popular over here, there were low-cost adapters and software for lots of common machines, including Commodores. > ::Ob.pedantry: it would be Viewdata (comms channels), not teletext > ::(broadcast). > > *blush* :-) I'll let you off -- lots of people don't know the difference :-) -- Pete Peter Turnbull Dept. of Computer Science University of York

24 years, 9 months

FOCAL language reference manual?

by paulrsm＠ameritech.net

Thanks, Tim, I was actually hoping for a FOCAL language reference manual. I started learning computers with a KIM and machine code. I did a little work with FOCAL on the KIM but my memory is very hazy about the language itself. ---------- > From: CLASSICCMP(a)trailing-edge.com > To: classiccmp(a)classiccmp.org > Subject: RE: FOCAL (was: KIM/6502 code) > Date: Thursday, March 23, 2000 12:27 PM > > I hope this helps. If none of these packages meets your needs, you > might ask again for your specific platform(s). Enjoy!

24 years, 9 months

DEC ADV11-A A/D Converter

by mbg＠world.std.com

>That's kind of what I thought it meant :^( Guess I really will have to >get the PDP-11/23 up and running if I want to play with this board. Make sure it is a 11/23, not 11/23+, and make sure it is a Rev.A board or it too will be looking at BDAL18... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

24 years, 9 months

DEC ADV11-A A/D Converter

by pete＠dunnington.u-net.com

On Mar 23, 16:33, healyzh(a)aracnet.com wrote: > Well, I know it's a /23, but I don't know the rev, knowing my luck it's not > a Rev A. I'll have to check, thanks for the warning! > > <Sigh> I gather these things would work in a 16-bit backplane such as my > /03's? Yup, that's what they were designed for. -- Pete Peter Turnbull Dept. of Computer Science University of York

24 years, 9 months

teletype wanted.....

by pete＠dunnington.u-net.com

On Mar 23, 13:40, Cameron Kaiser wrote: > Speaking of teletypes, I ended up with a matching set of Philips TX-1000 > Text Tells which are, I guess, meant for teletext transfer over phone lines. > (The manual and the machines are Dutch.) Anyone ever dealt with these? > Know the communication protocol, or are they just like any other traditional > modem when they transmit/receive? The type number looks familiar, but I can't be certain. What do they look like? I expect they'll be V23 Mode 2 (1200 baud FSK receive using 2100/1300Hz, 75 baud FSK transmit using 450/390Hz CCITT tones). If they're what I think they are, they can be programmed with a number to dial, a user ID and a (numeric) password which is sent on receipt of a ctrl-E (ENQ) from the remote end, but it should also be possible to use them manually. Ob.pedantry: it would be Viewdata (comms channels), not teletext (broadcast). -- Pete Peter Turnbull Dept. of Computer Science University of York

24 years, 9 months

DEC ADV11-A A/D Converter

by pete＠dunnington.u-net.com

On Mar 23, 14:31, Chuck McManis wrote: > You mean like "this board isn't compatible with a 22bit backplane" kinds of > things. (which it isn't BTW, that's what the note is about BDAL18 is > address line 18 which is called BC1 on 18 bit backplanes.) > > I'm not sure how you would use it in a system with a 22 bit backplane. Even > if you pulled the address line off the back plane the board's CSR registers > would show up in memory space and you would have bus contention. I don't believe that's true -- that board uses BBS7 to decode I/O space, so it should appear at the correct address. The only problem is BC1, which, like other "unused" contacts, is grounded (presumably to reduce noise). Just cut the track from the BC1 finger. The ADV11 is listed as "restricted compatibility", not "incompatible". -- Pete Peter Turnbull Dept. of Computer Science University of York

24 years, 9 months

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by pete＠dunnington.u-net.com

On Mar 21, 23:05, Allison J Parent wrote: > > <I don't really see how the fanout units on offer (or my unsuccessful > <back-to-back device) could do that -- the termination isn't in the > <transceiver or fanout unit, it's a resistor on the end of the cable. > < Anyway, it would still only be one termination domain. Or maybe I've > <misunderstood what you mean? If you mean my back-to-back transceiver idea > <yes, if it had worked, you could use it to split a termination domain into > <two, just like a two-port repeater, or a very simple bridge (except a > <bridge usually separates collision domains too). > > Anyone ever heard of a DELNI? Ok, it was an 8 port AUI to AUI with a 9th > for AUI to h4000 fat eithernet cable. Popular use was for cobbing 4-7 > system together locally if you didn't have the BIG backbone. Logial > equivilent of a 8 port hub used for 10bt. Yes, never knowingly used one, but I've seen them. 3Com made an 8-port(? or 6?) AUI repeater -- one of my friends used one as his hub for a while, I believe. -- Pete Peter Turnbull Dept. of Computer Science University of York

24 years, 9 months

teletype wanted.....

by acierno＠mindspring.com

Hi everyone.... I tried to post the message before but never saw it posted so excuse me if you see this twice. I'm trying to find a teletype to add to my KIM-1- if anyone has one that they are willing to part with ( for a reasonable price) or knows anyone who is selling one please let me know.I've checked the obvious places (e-bay-hell) and have not yet seen one. mark ------- ICQ 40439199 http://www2.msstate.edu/~mja2

24 years, 9 months

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test-drb March 2000