test-drb October 2005

test-drb@ccmp.vtda.org

264 participants
655 discussions

by henk.gooijen＠oce.com

Hi all, I finally got juice on the main power line connection in my museum. I am connecting my machines bit by bit, after 2 years of inactivity. I have found the following problem with my 11/34C. (I will keep the description short, and tell only the end result) The console of the 11/34C (11/34A plus cache option) shows weird (=wrong) behaviour. It was working fine! The display shows "000000", and the RUN LED is off. If I press the 'LSR' button, the 'SR DISP' LED goes on. However, if I press any of the numerical buttons, '1-6', a digit in the display only flashes very brief. I cannot say what the digit was. It looks like the M7859 has developed a problem. To make things more weird the following happens if I start with pressing the 'CLR' button and then the numerical buttons. 1) press CLR (display stays at "000000") 2) press e.g. 6 (some of the rightmost digit segments briefly flash) 3) press 6 again (1st and 2nd of the right display flashes) 4) press 6 again (1st, 2nd and 3rd of the right display flashes) The first leftmost three displays remain "000" and do not show any sign of changes. Pressing 6 after the first 3 times, repeats the flashing of some segments in the three rightmost displays. So, I have the impression it has the problem to do with the M7958. AFAIK, the entry of the digits, for example the numeric entry '165020' does *not* need the UNIBUS, but only sets up an internal register. The 'LAD' button, and 'DIS AD' will start a UNIBUS cycle (to access a memory location). Correct? BTW, the voltage on the CPU backplane (DD11-PK) is 5.08 V. and the +15 and -15 read +/-15.x V. (Can't remember the exact value). I have an other 11/34 with an M7958, but never powered up that box. I took that M7859 and installed it in the 11/34C. The display stays dark. According to the M7859 doc, that basically means that the board is dead. So much for board swapping. Sorry, could not resist to try an easy success. I don't have other spare M7859 ... If you are interested, I can tell the steps I did before I stumbled on this M7859 (?) problem ... Anybody seen this display / console panel behaviour on the 11/34 ? Any clues ? All input is appreciated ! thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.

19 years, 1 month

Waht is an MC1806 ?

by technobug＠comcast.net

On Sun, 30 Oct 2005 22:41:27 +0000 (GMT), rd at p850ug1.demon.co.uk (Tony Duell) wrote: > I am working on an HP59405, which is the HPIB interface for the HP9830 > 'calculator'. On the PCB are 2 chips which cross to something > called an > MC1806. This is not in any of my Motorola databooks. > > > Does anyone have a databook that lists it? > > -tony > > > This is the short description: Part Number = MC1806P Description = 2-Input AND-Function Logic Gate Manufacturer = Motorola Circuits Per Package = 4 t(PLH) Maximum (S) = 35n P(D) Max.(W) Power Dissipation = 75m Vsup Nom.(V) Supply Voltage = 5.0 Status = Discontinued Package = TO-116 Pins = 14 Military = N Technology = DTL The attached PDF is a overall listing of the Motorola DTL. Hope this helps. CRC?

19 years, 1 month

Big dollars paid for Altair 8800 on Ebay

by ajp166＠bellatlantic.net

> >Subject: RE: Big dollars paid for Altair 8800 on Ebay > From: "Chuck Guzis" <cclist at sydex.com> > Date: Mon, 31 Oct 2005 15:31:35 -0800 > To: cctalk at classiccmp.org > >On 10/31/2005 at 5:06 PM Gil Carrick wrote: > >>SWTP being a Texas company they would go well in our museum. What are you >>looking for? > >Gil, I'm not a collector. Just finding someone with a SWTP TVT that >they're trying to get operational would be sufficient. I also have the >assembly instructions and schematics. > >I've long since discarded the (very heavily modified) main board. One of >the first changes I recall doing was modifying it to display 16 lines of 64 >characters and recognize a few more control characters. Interestingly, >that last was mostly done with diodes and pullups instead of TTL gates. >Shortly after that, I graduated to a Beehive Super Bee terminal. > >The serial board has an NE555 installed on it with a small trimpot as a >baud rate generator. IIRC, 7497's were pretty hard to come by back then. > >I think I've got a taker, for the cards, BTW. Just need to get them into a >small Priority Mail box and off to the PO. > >Cheers, >Chuck > >>... >>> Speaking of old stuff, when looking for something else, I ran >>> across the serial and RAM cards for the SWTP TV >>> Typewriter--are they worth anything or are they better used >>> as landfill material? Not landfill fur sure. I acutally have a working TVT and most of it's docs with same mods you did save for mine was interfaced as parallel to the Altair. Works ok with a modern LCD TV! Allison

19 years, 1 month

Need help configuring DZQ11s on 2.11BSD for VCF!

by bob＠jfcl.com

Hi Guys, Debee is depending on me to get this PDP-11 working for VCF this weekend (she's speaking on Sunday!). I've got a 11/73 with 2.11BSD. The hardware configuration is pretty typical - RQDX3, DEQNA, TK50, and one DZQ11. Everything runs fine, but I need to install a second DZQ. The first DZQ has csr 160100 and vector 300, so according to my calculations the second should be at 160110 and vector 310. I set the switches, install the card, and then edit my system configuration to change NDZ to be 2, rebuild the kernel, reboot, and, .... Disappointment! When it gets up to init, it says: init: configure system dz 0 csr 160100 vector 300 attached ra 0 .... 172150 .... 154 tms 0 .... 174500 ... 260 ... etc ... nothing about the second DZQ. Everything else still works, including the original DZQ11, and it boots up just fine except that there's no sign of the second DZQ11. I figured I made a mistake building the kernel, so I double check my kernel configuration and yes, the file dz.h contains "#define NDZ 2". Just to be safe I delete all the objects from my machine's configuration directory and rebuild the entire kernel from sources (takes a couple of hours on a 11/73!). Still no joy - init only finds one DZ... And I'm sure I'm booting the new kernel because of the timestamp it prints out when you boot it. At this point I figured it's a hardware problem. Just to be sure, I pulled out both DZQs and swapped the switch settings on the two cards. This makes the original DZQ card now the "second" one at 160110/310 and the new card the "first" DZQ at 160100/300. Put it all back together and boot it up again - same results! Init finds the first DZ but not the second! Moreover, all the serial ports on the back that are now connected to dz0 (which is the card that used to be the second dz) still work! Of course, the ports on dz 1 (which is the card that used to work) are now dead. It seems like the two DZQ11 cards must be OK. Oh, and BTW, I even used the 11/73's console ODT to verify that all addresses from 17760100 to 17760117 respond. The only explanation I'm left with is a configuration problem. Is there something I don't know about rebuilding the 2.11bsd kernel? Is 160110/310 the wrong location for the second DZQ11? Thanks much, any suggestions are appreciated. Bob Armstrong

19 years, 1 month

whatsit?? Old stuff, bench electronics? Radio? I dunno.

by jwest＠classiccmp.org

Quite some time ago I got this stuff from my high school, I believe it came >from the physics department. I mentioned it on the list and some expressed interest in pictures. Just now got around to it. See http://www.ezwind.net/jwest/whatsit Should I pitch this stuff? Anyone know what it is? Jay

19 years, 1 month

PC disk drive termination

by ard＠p850ug1.demon.co.uk

Somebody earlier claimed that IBM didn't bother with termination on the disk drives in the PC family. I've just looked in the 'Hardware Maintenance and Service' manual for the PC/AT. This is the only HMS manual I have (I don't normally bother with boardswapper guides), but I would be suprised if the same principles didn't apply to the PC. Anyway, the manual says : 'Diskette Drive o The terminating resistor must be installed on drive A (top unit). o In a system unit with 2 diskette drives, remove the terminating resistor from drive B (bottom unit) for proper operation. o The diskette drive end of the signal cable is attached to diskette drive A. Fixed disk drive o The terminating resistor must be installed on fixed disk drive C (left unit) o In a system unit with 2 fixed disk drives, remove the terminating resistor from fixed disk drive D (right unit) for proper operation ' There are diagramss showing the location of the terminating resistor pack on the drive PCB that I can't sensibly reproduce in ASCII. -tony

19 years, 1 month

PC Ephemera

by cclist＠sydex.com

I've been going through some old files and discovered a few of documents that I can't decide if they belong in the the shredder or with someone who gives a darn about them. Does anyone remember the background behind the "Explorer 88 PC" by Netronics R&D circa 1983? Was it a do-it-yourself PC kit? Anyway, I've got the schematics for the thing. I've also got the guide by Purple Computing for their Purple -2 Kit on how to put 256K on your PC motherboard by cutting and changing a few jumpers and then adding a board that attaches over the memory array that holds 64K DRAMS. I'd forgotten that the original PC was limitied to 64K on the mobo. Time erodes one's memory. I've also got the manual for the Teletype 410640 printer logic card assembly. IIRC, this was for the Model 40 line printer. It includes schematics and parts layout. ...and I discovered a complete unopened OEM kit for MP/M II, complete with licensing pricelist and 8" floppies. I'd forgotten all about it. (I may hang on to this one for the time being). Funny thing is that I don't remember half the stuff in my files... Cheers, Chuck

19 years, 1 month

TX990 diskettes--recycle or useful?

by cclist＠sydex.com

Just ran across a box I thought had nothing but blank 8" diskettes and found instead 7 diskettes, labeled "TX990/TXDS Release 2.0"; diskettes 1-5, with what appears to be dupes of diskette 2-4. All are stamped "Property of Texas Instruments Incorporated" "(C) 1977, Texas Instruments Incorporated" Are these worth anything or can they be tossed into the "reuse" pile? I haven't tried reading them yet. Cheers, Chuck

19 years, 1 month

Big dollars paid for Altair 8800 on Ebay

by GFisher＠tristonecapital.com

Take a look at item #8707485844 http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=8707485844&rd=1&sspagenam… which ended on Thursday. It went for USD $7,877.11 for a supposedly serial number 3 unit, run up by bidders from Switzerland, the US and finally the UK. It had been heavily modified internally, with even a hard disk inside. My question to all is that was the unit more valuable (because of the low serial number) than a later unit that had all of the original MITS cards, motherboard and powersupply? My experience with car collectors (Corvettes), is that a unit in stock factory condition is more valuable than one that has been heavily modified. I suppose the buyer is going to restore the original MITS cards as it was first available, or is he going to keep it intact as it was sold to him? It would be interesting (to me) to know peoples collecting philosophies about that. Gary Fisher Tristone Capital Inc. This e-mail and any attachments may contain confidential and privileged information. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this e-mail and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal. Unless otherwise stated, opinions expressed in this e-mail are those of the author and are not endorsed by the author's employer.

19 years, 1 month

FS/FT: IBM S/390 parts

by pat＠computer-refuge.org

I've got 3 x QX46 512MB memory modules from my old 9672-RC4. Asking $10+shipping apiece. Also have a few (4-5?) 4-port ESCON cards, each has a Siemens 100MHz optical transceiver on it, if you want it for parts. Asking $5/board + shipping. I don't have the aluminum frame they came in any more, they're just the PCB part of the module. No responses by Wednesday and they'll be off to the scrapper. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

19 years, 1 month

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test-drb October 2005