test-drb October 2013

test-drb@ccmp.vtda.org

178 participants
205 discussions

pdp8 and pdp11 front panel keys available.

by roe＠liveblockauctions.com

I've had 10 dec # XX2247 front panel tubular keys machined from the original DEC code settings. These are not duplicates of an existing key, but freshly machined based on the actual key requirements, so they are suitable as master originals. They have all been tested in my pdp11/20 and work perfectly. These will fit pdp8 (classic), pdp8/e, 8/I, 8/L, 8/m, and the 8/L expansion box, as well as the pdp11/15, /20, /30, /45, /60 and /70; also fits the VAX 11/750. They will also work in the pdp 11/24 and 11/44, but are not really required; any ACE blank will work with these two machines. Price is $16 USD including postage in North America; I imagine postage to the EU and points east will be slightly more expensive. Available immediately.

10 years, 6 months

Working Atari Mega 4 ST for sale

by shawn-gordon＠cox.net

I have it on craigslist, but I have all the parts and a ton of software. Feel free to contact me directly. If it needs to be shipped, we'll have to figure that out. Thanks. http://orangecounty.craigslist.org/sys/4151372025.html

10 years, 6 months

Floppy drive head protector cardboard.

by me＠GarrettMeiers.com

Does anyone know of a source to purchase, in quantity, the cardboard head protectors for 5.25" floppy drives? Thanks, Garrett Meiers www.linkedin.com/in/theunixguy

10 years, 6 months

AW: Re: Nuclear Data ND600 system documents and schematics

by p.gebhardt＠ymail.com

Hello Richard, sorry I did forget to answer your mail. I contacted Al a few days ago before uploading the docs to the bitsavers ftp-server. He will put them online. Kind regards, Pierre ------------------------------ Richard schrieb am So., 27. Okt 2013 19:46 PDT: > >In article <1382506053.54989.YahooMailNeo at web133101.mail.ir2.yahoo.com>, > P Gebhardt <p.gebhardt at ymail.com> writes: > >> somebody asked for documentation about the ND600 system. > >That was me. I sent you a private email, but never heard back. If >you email the PDFs to me I'll get them onto bitsavers. >-- >"The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> > The Computer Graphics Museum <http://ComputerGraphicsMuseum.org> > The Terminals Wiki <http://terminals.classiccmp.org> > Legalize Adulthood! (my blog) <http://LegalizeAdulthood.wordpress.com>

10 years, 6 months

S-100 80286 CPU board now running at 12 MHz.

by monahan＠vitasoft.org

More good news Guys. I now have our 80286 S-100 board running at 12 MHz (no wait states) with our 4MG Static RAM board. I noticed that my bus controller (U68) was a 82C288. Looking around here I found I had an 82C288-10. When I tried that, the board came up fine at 12MHz (no wait states). Clearly the CMOS clock generator while rated for 10MHz, works at a higher speed. The original 82C288 I think is for 8MHz, pushing it to 12 was too much. Fortunately I already have a 12Mhz clock generator (28C284-12) on board. Looking here:- http://www.cpu-world.com/CPUs/80286/MANUF-AMD.html I see there are PLCC 16MHz AMD chips. Does anybody know where to find these chips and the corresponding -16 clock generator and bus controllers. John From: n8vem-s100 at googlegroups.com [mailto:n8vem-s100 at googlegroups.com] On Behalf Of David Fry Sent: Saturday, October 26, 2013 1:22 PM To: n8vem-s100 at googlegroups.com Cc: cctalk at classiccmp.org; Andrew Lynch; monahan at vitasoft.org Subject: [N8VEM-S100:2006] Re: S-100 80286 CPU board write-up Hi John Excellent news :-) I was kinda holding off on starting my 80286 board in case the mods/fix ended up being extensive (I have the S-100 Ram/Rom board on order also) Just wondering if will you be investigating why the final board will only manage 11Mhz when the prototype manages 12Mhz ? It's not a big issue but would be nice to get to 12Mhz if possible. regards and thanks David Fry On Saturday, October 26, 2013 7:06:09 PM UTC+1, monahanz wrote: Good news, It now looks like our new 80286 Master/Slave S100 bus CPU board works fine with not only our 4MG Static RAM board bit also the 1M RAM/ROM board. The problem I outlined below was due to the fact that I had jumpers wrong on both the CPU and ROM/RAM boards. The 80286 works fine with both boards at 11MHz (with no wait states). One of the reasons for "upgrading" the ROM/RAM board was to simplify the "rats nest" of jumpers on the earlier boards for the diverse range of RAM & RAM chips (including flash RAM) that board can use. The new RAM/ROM boards should be here soon. If you have the older board, consider switching over (it uses all the same chips/parts) . For new users it is a very useful memory board. One remaining bug I see with the 80286 board is that some older S100 Static RAM boards (particularly those that use PALs, such as the Godbout 128K static "RAM21" board or the BG Computers 256K Static RAM board), need a patch. You need to bend out pin 2 of U56 and jumper it to pin 9 of U68 - the bus controller. This seems to provide the early MWRITE status signal these boards require. Interestingly this is also the case for our 8088 CPU board (jumper K5,2-3), but not the 8086 board. I have written up a detailed account for the 80286 boards construction here:- http://www.s100computers.com/My%20System%20Pages/80286%20Board/80286%20CPU%2 0Board.htm And a description of the RAM/ROM board here. http://www.s100computers.com/My%20System%20Pages/RAM <http://www.s100computers.com/My%20System%20Pages/RAM&ROM%20Board/RAM&PROM%2 0Board.htm> &ROM%20Board/RAM&PROM%20Board.htm Enjoy John From: John Monahan [mailto:mon... at vitasoft.org <javascript:> ] Sent: Sunday, October 20, 2013 10:53 AM To: 'n8vem... at googlegroups.com <javascript:> ' Cc: 'cct... at classiccmp.org <javascript:> '; Andrew Lynch (andrew... at sbcglobal.net <javascript:> ) Subject: S-100 80286 CPU board write-up Hi everybody. I have just written up construction notes on this 80286 CPU board. Please see here:- for details:- http://www.s100computers.com/My%20System%20Pages/80286%20Board/80286%20CPU%2 0Board.htm Unfortunately there are some strange issues with the board running with RAM boards other than our 4MG Static RAM board (described here:-) http://www.s100computers.com/My%20System%20Pages/RAM%20Board/4MG%20RAM%20Boa rd.htm With that RAM board, the 80286 is rock solid at 11MHz (no I/O or ROM wait states required). Please see the bottom of the page for details. I am traveling all of next week but will explore further when I get back. Sorry about the bad news John -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+unsubscribe at googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.

10 years, 6 months

Nuclear Data ND600 system documents and schematics

by p.gebhardt＠ymail.com

Hello list, somebody asked for documentation about the ND600 system. Finally, I found some time to scan all docs I have about it. They're available as PDFs. Contact me off-list to get them. Alternatively, the docs could be put online on bitsavers, if Al would be fine with it and finds the time to do so. Kind regards, Pierre ? ------------------------------------------------------------------------------- Pierre's collection of classic computers : http://classic-computing.dyndns.org/

10 years, 6 months

My Acorn A4000 on You Tube

by terry＠webweavers.co.nz

It's been a long time between drinks, but finally a video on my Acorn A4000. http://youtu.be/_iodsz5LPio

10 years, 6 months

Manchester UK - Friday 1st December

by dave.g4ugm＠gmail.com

I Know I should have Classic in there as well... http://www.meetup.com/Manchester-Vintage-and-Retro-Computing/ but I don't, but if you are in the area come along any way... Dave

10 years, 6 months

Netcom system with an HV-1148 backplane

by jhfinedp3k＠compsys.to

>azd30 wrote: >Hi, > >I recently aquired an old Netcom system and I'd like to find out a bit more info about this backplane. >It's an 11/23 system (based on CPU) . It has some standard DEC >cards in it (M8186 CPU, DLV11, BDV11 bootstrap board ) as well as a thrid party 256Kb memory board and an MXV22 floppy controller. >Apparently the system ran RT-11 from floppies a few years back before it was put in storage. > > If you can specify all the boards (or at least the DEC boards) by their board number (i.e. M8186), it would be more useful. Is the DLV11 an M8043 (actually DLV11-J)? Just in Case, please also mention dual or quad board. >I have read through the PUPS archives, esp. a post from Michael Sokolov back in 98, where he describes >the different types of QBus'es. Q/Q, Q/CD etc. Have also read through the info on hampage.hu and various other sites that host PDP11 related info, >but am still unsure about this particular beast. > >It looks like the backplane that I have (according to the archives and some documents written at SLAC in late 70's) >is a serpentine or sinusoidal type configuration. The SLAC documents actually refer to the Netcom backplane but they >describe it a simple serpentine type. > >A diagram on my cardcage describes it as follows: > >A B C D >------------> ><----------- >-------------> ><------------ > >There is also a blurb about slot 2/CD being wired differently. Two slots on the diagram are pre-printed for RL controllers. I can't rembeber the exact wording, since I don't have the computer in front of me. > > This is possible, but seems VERY unlikely with just a 4 slot backplane. As far as I understand, in order to be useful to support an RL controller, at least 2 slots must be wired as ABCD. The BA23 box has the first three slots as ABCD and the other five slots as ABAB, so the concept is possible. Having two ABCD slots also supports PMI memory with the memory being placed in slot 1 and the CPU in slot 2, but that requires at least a quad M8190 CPU card. >It gather that I insert the CPU in 1AB, then rather than putting the next card in 2AB, I would place it in 1CD. Next would be 2CD and so on ,snaking down the line. Is this correct? While this is all fine for dual cards, but how does this configuration >handle quad cards? I'm guessing that it has to do something with that 'blurb', but that would mean that I can only have one quad card installed, and it would be right towards the begining of the bus. The BDV11 should >be the last card in the chain from what I can remember. > > I forgot to add, please also specify where all the current cards are located in the back plane. With an M8186 to start, the BDAL17-20 lines should be either unconnected (for an 18 bit backplane) or ONLY connected to each other (for a 22 bit backplane). If they are unconnected, installing connections should convert to a 22 bit backplane and you M8186 should be able to access as much memory as you are able to place in the backplane (up to 4 MB of course). At one point, a VT103 backplane was upgraded to 22 bits and a 4 MB memory board installed. >Also, my CPU card is a rev. D so it can do 22bit addressing. I'd like (if possible) to run 22bits, since this would allow >me at a later time to put in a 11/73 cpu that would give me more flexibility in what OS's i can install on the machine. > >I'll have to check if the backplane is wired for 22bits or not. I seem to remeber the standard qbuses had the W1-W4 pins (?) >that you could wirewrap to change from 18to22 (i'm assuming that this operation propagated the BDAL17-20 from slot 1 to the other slots) but this backplane has nothing like that. >I'm planning on checking it with an ohmmeter, and it should be very obvious if these signals are present across slots. > >The backplane is a PCB style, but it does have std. wire wrap pins sticking out from the PCB. If the BDAL17-20's are not present across slots, can I just simply extend them thru by wirewrapping? > > Probably. For the VT103, there were no pins, just the solder bumps. That was sufficient to attach the required wires. Note that all of the ABs must be connected, not just the ABs on the left side of the backplane. For the VT103 with a 4 slot ABAB backplane, that meant eight connections per each of the four wires to connect the BDAL17-20 together (each to themselves of course). >If anyone can shed any light on this backplane, it would be greatly appreciated. > >thanks in advance for any replies. > >-- >alex > If you have any more questions and you answer the questions, it may be possible to help some more. Jerome Fine

10 years, 6 months

Original Boxes

by nf6x＠nf6x.net

Some of the items I've acquired lately have come in original boxes: * Tandy Color Computer 3 * Tandy CM-8 Monitor for Color Computer 3 * Tandy CCR-81 Cassette Recorder * Star Micronics Gemini 10X Printer * Kensington System Saver for Apple IIe * HP 82240B IR Printer (for HP 48 calculator family) Most of the boxes aren't in great shape, box collecting doesn't interest me, and I don't want them taking up my space. Is anybody interested in any of them before I throw them out? I'm in southern California, so they could be picked up near Riverside (weekends) or Irvine (weekdays) if desired. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

10 years, 6 months

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test-drb October 2013