test-drb August 2005

test-drb@ccmp.vtda.org

227 participants
528 discussions

by Richard.Cini＠wachovia.com

Refining the BBS idea a bit, the problem with it is multiplexing. You'd need to run a modem bank (like Hayes or Multitech) into the PBX and use an n-port serial card in the host PC. The PBX I'm sure can be set for number fallover so if you keep dialing extension "101" and it's busy, it will roll to extension 102, etc. I used to have a 24-modem (2400 baud) Multitech modem bank from an old DEC installation but I got rid of it a long time ago. Just another piece of hardware I should have kept... Rich -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vintage Computer Festival Sent: Tuesday, August 02, 2005 11:38 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: RE: Analog modem emulator? On Tue, 2 Aug 2005, Cini, Richard wrote: > This setup should then work if I wanted to demonstrate old BBSes and > how one could dial into them using classic hardware. For example, using > classic machines like the Apple II or even an IMSAI with a 212A modem or the > DC Hayes board to dial into a CBBS setup hosted on a PC. This would be a > great VCF demonstration, particularly if you could have a few machines from > different displays "dialing-into" the BBS. That's a great idea. Next VCF I could run a PBX through the exhibit area and then anyone exhibiting a live computer with a modem could hook it up to the PBX and we could have people dialing each other's exhibits. Not very practical but fun. An even better idea that I've been toying around with is to do a version of Core Wars. I'd come up with a basic specification and then it would be up to each exhibitor to write an implementation on their exhibited computer. The network would be serial based so just about anyone should be able to hookup. Whoever wins would get the Grand Prize ;) If this sounds like fun to you then please send me some feedback (directly preferred). If there's enough demand then I'll put it higher on my priority list amongst the 30,000 projects I already have going on. -- Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

20 years

Emulex DM01 information

by aek＠bitsavers.org

A DM01 manual scan is up now at http://www.bitsavers.org/pdf/emulex/DM0151002-B_DM01tech_Apr89.pdf

20 years

Replace roller rubber on HP 9825 tape drive

by vp＠cs.drexel.edu

ard at p850ug1.demon.co.uk (Tony Duell) wrote: > Can't be! The 9830 tape drive and cassette are very different to those > used in the 9825. Mea Culpa. Its from the 9825A manual. The web page had the correct attribution all along. I do not know what I was thinking as I was typing the article (prob 9835 as I have the service manual for that one as well). ---------------------------- "Joe R." <rigdonj at cfl.rr.com> wrote: > You might want to add this picture <http://www.classiccmp.org/hp/hp-tape.jpg> > from my website. It shows the tape and belt paths better than the one you > have does. I have added it to the page, much appreciate it. It is better, although kinda low res. Anybody have a better scan of that image? Thanks **vp

20 years

Analog modem emulator?

by Richard.Cini＠wachovia.com

Sellam: This setup should then work if I wanted to demonstrate old BBSes and how one could dial into them using classic hardware. For example, using classic machines like the Apple II or even an IMSAI with a 212A modem or the DC Hayes board to dial into a CBBS setup hosted on a PC. This would be a great VCF demonstration, particularly if you could have a few machines from different displays "dialing-into" the BBS. Rich -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vintage Computer Festival Sent: Tuesday, August 02, 2005 10:33 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Analog modem emulator? On Mon, 1 Aug 2005, Pete Bartusek wrote: > ...but my scenario is different in that I want the connection going to the > PC to still be analog lines. So, this device would have to have some sort of > modem emulation of its own. I doubt you'll find anything to do this, not that they don't exist, but if you do it'll probably be outside your price range. Sounds like a custom solution to me. Get a Linux box with a modem and an external switch (in this case "switch" meaning a PBX of some sort). A Panasonic 606 is perfect for what you need: small, easy to program (the default programming will work), and it's a hybrid so it uses both proprietary digital sets and normal analog sets (auto-sensing). They're also abundant and probably cheap by now. In fact, I think I have one I can sell you. A Panasonic 1232 is the same thing with just more ports (12 CO trunks, 32 stations) but overkill. Plug the 4 modems of the target box into one of the 16 extensions, then plug the modem on the Linux gateway into a fifth extension. The Linux modem can then dial directly into any one of the 4 target machine modems by dialing its extension number. Then, write some software to do the conversion :) -- Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

20 years

Analog modem emulator?

by Richard.Cini＠wachovia.com

JDR Microdevices has an 8-port PCI card for $128. Look for item MCT-P8S-1. I noticed that they also have a 4-port ISA card, too. That's $48 (item MCT-4S-1). Rich -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vintage Computer Festival Sent: Tuesday, August 02, 2005 10:20 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Analog modem emulator? On Mon, 1 Aug 2005, Vintage Computer Festival wrote: > I have a great multi-port (8) ISA serial card that's super > easy to configure. It uses standard 16550s mapped to standard base > addresses and uses one interrupt. You can even chain up to 4(?) more > cards to it that share the same interrupt. It has an external connector > (something like a DD-50) that then plugs into a breakout box where you > have all 8 ports as DB-25s. It's a generic board and I don't have any > info off-hand to help you find one but if anyone's interested then e-mail > me and I'll find out where you might be able to order one. I'm sure they > turn up on eBay from time to time as well. It's called the Decision Computer Group PC-COM ISA Bus 8 port RS-232/422 card. Here's some technical info: http://www.thegreenhouse.us/th99/i/C-D/52585.htm http://www.thegreenhouse.us/th99/i/C-D/52584.htm Here's their website apparently: http://www.qna2002.com/ Not sure how you're supposed to order one. I used to buy mine through the same company that wrote the C serial port library I used. -- Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

20 years

Emulex DM01 information

by fm.arnold＠gmx.net

Message: 26 Subject: Re: Emulex DM01 information >Jerome H. Fine wrote: >> >Gordon JC Pearce wrote: >> >>> Hi there, >>> I need to find out about the ST506 cables for an Emulex DM01 QBUS >>> card. I've just got one with no cables. I understand that it's >>> similar to other Emulex MSCP cards (makes sense really) but it has a >>> 50-pin cable to connect the drives up. Anyone know how to make up a >>> cable for this? Or even, got a spare cable? >> >> >> Jerome Fine replies: >> >> Making up the cable is actually rather easy in this case. >> But my cable is buried somewhere at the moment. Basically, >> 34 lines are used for the 34 pin edge connector (daisy >> chained if there are 2 drives) and the remaining 16 lines >> are split into 2 groups of 8 lines, one for each of the >> two 20 pin edge connectors, i.e. one for each drive. The >> DM01 supports two MFM drives. If no one replies in a day >> or two, I will try and locate my cable and specify exactly >> how the connectors are set up. >> > >Did you ever turn this cable up? And does anyone know if the DM01 >controller will be compatible with the breakout board and 50-pin plug in >a BA23 enclosure? Yes, I did make those cabes some long time ago. I have no idea if the DM01 and the RQDX3 have the same pinout on the Drive-plug. But if you have the breakout board and a ohm-meter at hand I can suppley you with the relevant manual pages of the DM01 so you can make the cable and tell us the nice to know answer to the compatibility issue. Just tell me where to sent this, if not above adress. I will scan these pages tonight. Frank

20 years

VCF Midwest - off to a great start

by jack.rubin＠ameritech.net

My wife and I just got back from beautiful West Lafayette, IN, home of the (first annual) Vintage Computer Festival Midwest. I'm sure Pat will provide all the details relating to attendance numbers, etc. but from at least one participant's point of view, it was a great event. Ethan Dicks and Ray Borrill were the scheduled speakers; Hans Franke also gave a (relatively) impromptu presentation on photographing vintage computers. All the presentations were great though the audio quality in the room left a bit to be desired, especially for the more vintage among us who might be a bit lacking in audio input capabilities. The exhibit/swap section was small but a decent crowd showed up to view and buy/swap. My goal as a vendor was to return home with an empty car and I came close to achieving it, not counting the "new" treasures I picked up in exchange. Participants in the now traditional post-fest dinner included Pat Finnegan and crew, Tom Uban, Jay West, Dan and Karen Cohoe, and of course, Hans who, contrary to expectations generated by a well-known vintage computer journalist, had only one entr?e. Thanks again to Pat for putting this all together and giving those of us in the Heartland an opportunity to share our passion/affliction closer to home. Looking forward to next year ... Jack

20 years

Apple Classics found at local salvation army...

by john_boffemmyer_iv＠boff-net.dhs.org

Browsing Wappingers Falls, NY, USA salvation army today and walked past an Apple Performa 6115 and an Apple PowerPC 7200/120 with 10/100 Ethernet add-on card! Both work and there is an Apple 14" monitor, keyboard and video cable adapter too. Talked to the manager lady and she said she'd let it all go for $14.99 US. I don't do Apples too much and don't have the money to spend, but if anyone in the area wants em, they are still available. -John Boffemmyer IV

20 years

TG43 signal and the Nec 765 (Jules Richardson)

by ajp166＠bellatlantic.net

> >Subject: Re: TG43 signal and the Nec 765 (Jules Richardson) > From: "Herbert C. Williams" <herby1620 at yahoo.com> > Date: Mon, 01 Aug 2005 01:14:58 -0700 (PDT) > To: cctech at classiccmp.org > >The TG43 signal has NOTHING to do with pre-compensation. The original >IBM specification for single density (128 byte per sector, 26 sector >per >track, 77 tracks) floppies has an option to change the write current on IBM spec aside that, had little to do with what was done. >the drive head for the more densely packed sectors on the interior of >the disk. because of the constant angular velocity (360 rpm to be >exact) the interior tracks were more dense than the outer ones. To >prevent the bits from blasting into each other they (IBM) reduced the >write current on the inside (greater than 43, thus TG43) of the disk. >This was purely a drive option. Some later drives had more smarts and >could count track position on their own, and didn't need the signal. Precomp wasn't _required_ for Single density,however double density it was required. Also some vendows found that modifying the precompensation amount (due to bit crowding) based on TG43. Now I'd also add that TG43s effect on write current also had a similar effect on the bit shift that precomp would and the combined effect could be very profound. >Precompensation was NOT used on single density 8 inch drives. When Look at what you have already stated. Reduced write current was used to compensate for bit crowding on inner tracks.. if that not write compensation? Precomp is used for the the same reason only its based on the bit pattern. >things changed to double density drives (MFM encoding) precompensation >was necessary when too many transitions were next to each other. The >floppy formatter chip usually did this internally, and since it had the >track register, it could do it "automagically". Some did it >differently, but it basically shifted the bits a bit to one side or the >other to "compensate" for bit crowding. Actually the first generation (1791 and 765A) double density FDC chips did NOT do the precomp internally but instead supplied the signals needed to do it externally using fast TTL. Allison

20 years

HP 9825 computer/calculator manuals & Re: HPL manual request

by Steven_R_Hutchins＠raytheon.com

when he gets them scanned, where will they end up? Question on HPL, for anyone willing to help, The following line of code gets a value from the keyboard buffer. I looked in HPL Operating Manual 98614-90010 manual for keycode conversion table ( page B-3) and it only goes to 255. Where do I find out what these 2874,2873...ect values are , with respect to the keyboard buffer? 65: "kbd":pbeep 2460,.05;key}K;if K=2874 or K=2873;1}Z;kret 66: if K=2867;1}Z}W;kret 67: if K>=2896 and K<=2906;gto "char" 68: if K>=2916 and K<=2941;gto "char" 69: if K>=2788 and K<=2813;gto "char" 70: if K=2782;gto "char" 71: if K=2862;if T>0;" "}V$[T,T];T-1}T;gto "kret" 72: if K=2845;aclr ;gclr;tabxy 61,17;prt "(RAM) HPL 2.1 Ready";stp ;end 73: gto "kret" 74: 75: "kret":V$[1,16]}T$[1];kret 76: 77: "char":if D=0;1}S;if T<16;T+1}T;char(asc K)}V$[T,T];gto "kret" 78: if D>0 and D<5;if T<6;T+1}T;char(asc K)}V$[T,T];gto "kret" 79: gto "kret" |---------+-----------------------------> | | "Joe R." | | | <rigdonj at cfl.rr.co| | | m> | | | Sent by: | | | cctech-bounces at cla| | | ssiccmp.org | | | | | | | | | 07/30/2005 10:19 | | | AM | | | Please respond to | | | "General | | | Discussion: | | | On-Topic Posts | | | Only" | | | | |---------+-----------------------------> >---------------------------------------------------------------------------------------------------------------| | | | To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> | | cc: | | Subject: HP 9825 computer/calculator manuals & Re: HPL manual request | >---------------------------------------------------------------------------------------------------------------| Oops! I forgot to add that HP refers the HPL users to the HP 9825 Calculator manual for more details on HPL. There's an auction of E-bay right now for a set of HP 9825 manuals. That's what reminded me about the referral. <ttp://cgi.ebay.com/HP-9825-computer-calculator-manuals_W0QQitemZ6788289667Q QcategoryZ16210QQrdZ1QQcmdZViewItem> Joe At 09:58 AM 7/27/05 -0400, you wrote: > > > > >I was able to find HPL Operating Manual and Programming Update >(09826-90040) on bitsavers website. I have HPL Operating Manual >(98614-90010). Does anyone know if HPL Condensed Reference (98614-90020) >is archived anywhere? Is there any other references available for HPL 2.1? > >Hutch I just finished packing a BUNCH of HP manuals and shipping them to Al to be scanned and archived. In the pile are several HPL manuals, a manual for BTL (Board Test Language, a variation of HPL that was used on the 3060 circuit card test station) and a photocopy of the HPL Condensed Reference Manual. Joe

20 years

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test-drb August 2005