test-drb June 2009

test-drb@ccmp.vtda.org

233 participants
404 discussions

by iamvirtual＠gmail.com

Dennis Boone drb at msu.edu wrote: > > "I was thinking of using vtserver to transfer the image over a serial > > line, but the 'copy' program is not compatible with my PDP-11/05 (it > > uses the 'mul' and 'div' instructions which is not available on my > > PDP-11/10)." > > I haven't exhaustively searched for such instructions, but a sample > multiplication found in the C source didn't turn into a mul > instruction. You sure this is the cause? > > De Looking at the source for vtserver v2.3, the srt0.s file contains the 'mul' instructions. The copy program is aware of the I&D space. It appears the primary purpose of vtserver is to allow the installation/copy of early Unix versions onto RK05's. The source to vtserver appears to be implemented using the early unix version, so it is not really what I need since I cannot modify it to work on my PDP-11/10. The initial vtboot portion of vtserver does work properly on my PDP-11/10. I am able to have the 'copy' program transferred over to the /10 but the processor halts soon after execution begins. The source for vtboot does look like it should work on most machines. I updated the code slightly to make it position independent. I am thinking I will need to write something that will allow me to transfer the disk image over a serial port. I just don't want to re-invent the wheel ;-) My needs are to take a disk image on a host machine and get it transferred over to a PDP-11 via a serial port to be scribbled onto a RK05 disk. Does anyone know of another tool that can do this? I am aware of the TU58 emulator, but that only helps getting something into memory on the PDP-11, but does not help in getting the data onto the RK05. Thank you so much for the information to date! I really appreciate the pointers and discussion. --barrym

16 years, 1 month

govliq: SGI 4D/280GTXB, IBM 9395, 3 RL02, VAX-6000/310, PDP-11/84, PDP-11 kennedy 9400 (Jacksonville, FL)

by legalize＠xmission.com

Large bundle of stuff. The SGI machine looks in great cosmetic condition. RL02s look a little beat up, VAX and PDP-11/84 look in good cosmetic shape. <http://www.govliquidation.com/auction/view?id=2439594&convertTo=USD> The lot description says Textile Scrap, Misc. so I would enquire directly with the contact phone first before bidding. Roughly two weeks left to bid on it, though. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

16 years, 1 month

bizarre capacitance

by dgriffi＠cs.csubak.edu

Anyone here use an Extech multimeter? This thing seems to get confused with certain capacitors. In particular, a new 10uF electrolytic register randomly from 1 to 8 nF whereas a 1-year-old 1uF electrolytic registers fine. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

16 years, 1 month

Remembering the true* first portable computer ? The Register

by mross666＠hotmail.com

Why would the crypto guys want anything portable way back then? Common sense says it's easier to send the data to the computer than the computer to the data! Mike http://www.corestore.org _________________________________________________________________ Lauren found her dream laptop. Find the PC that?s right for you. http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290

16 years, 1 month

Further 11/40 unibus questions...

by bqt＠softjar.se

Paul Anderson <useddec at gmail.com> wrote: > I always used a M930 in the 11/40 and older machines, and the M9300 in the > 11/34 and newer machines. I have no way to check on the differences > now. now. Also, there may be a trick using MOS in an 11/40. I can't remember that there should be any functional difference between a M930 and a M9300. The later is just an improved design. As for the original posters problems. When you get a stuck machine when the terminator is in, but a somewhat more functional machine when the bus terminator is out, you have a problem on the bus. Most likely a bus grant or NPR grant. A third possibility is a problem in the CPU with the logic related to these signals. I'd go over the bus grants once more. Check that they *really* are the right way, since it's so easy to put them in the wrong way, and there is basically no visible clue to which way they should go. Look at some other card to get help. They will also have connections on the same places the BG cards have, except they will likely run them up to the priority plug. If you have some Unibus memory, they are nice, since they have the BG lines wired straight through, just like the BG cards. I would have started by removing *all* cards from the Unibus (with the exception of some memory), and make sure all bus grants and NPRs were in, the terminator was in place and that all power supplies were delivering the right voltage. Also check that all cards in the CPU box are in place, and are firmly seated. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

16 years, 1 month

loading disk image on PDP-11

by iamvirtual＠gmail.com

I am finally ready to load a disk image onto a RK05 disk for my PDP-11/10. I have RK05 disk images for RSTS-11 (my goal). What is the easiest way to load the disk image onto a RK05 cartridge? I was thinking of using vtserver to transfer the image over a serial line, but the 'copy' program is not compatible with my PDP-11/05 (it uses the 'mul' and 'div' instructions which is not available on my PDP-11/10). Here is what I have available: PDP-11/10 with 32kw core memory serial connection (max 2400 baud) RK05 (non-bootable cartridge but does load properly) external dual TU58 DecTapeII drive Many thanks for any information. I am really looking for a nudge in the right direction. ;-) --barrym

16 years, 1 month

Thanks to Henk G for Cipher 100X parts

by jws＠jwsss.com

Henk has sent a care package from the Netherlands to LA, Ca with the most useful 10 kilo's of parts from a 100X he was scrapping out. Just wanted to relay thanks to him for a really long distance scrounge via the group. I just reorganized the stash with one of the most serviceable of my drives, so it will be interesting to compare the parts with my drive revision when they get here. I prioritized the selection to take the parts with the most likely to degrade first, then the motion control and read/write boards, then a variety of other sensors and power supply boards. The entire drive would have been prohibitive to ship. Anyone else had to distill a large unit and what were the priorities or choices made to scrounge? Did they pay off yet (have you ever raided your stash and actually fixed one of your units or someone else's?) Jim

16 years, 1 month

S-100 home brew project

by lynchaj＠yahoo.com

Hi! Is anyone interested in an S-100 home brew project? I am thinking build a system using the principles in the Libes and Bursky books. A group project where everyone builds the boards on prototyping boards as we go. For example, an 8080A or Z80 CPU board, a SRAM/ROM board, a serial board, etc. Keep the boards relatively simple and low chip count -- nothing exotic. Thanks and have a nice day! Andrew Lynch

16 years, 1 month

DTC-510B controller

by r.bazzano＠ulm.it

Hello. I'm trying to replace a Xebec S1410A SASI controller with a Data Technology Corp. DTC-510B or DTC-510A, for a old homebrew computer (http://www.z80ne.com) The problem is that, even if the controllers should be "almost" compatible, the DTC-510A/B doesn't work (while the Xebec works fine). I'm not able to find any manual about it, only some dipswitch settings. Perhaps has someone a user manual for DTC-510B (and DTC-510A) so that I can compare commands, configurations, etc. with Xebec S1410A? Thank you very much. Roberto Bazzano

16 years, 1 month

Classic mac fun (and some questions)

by trag＠io.com

> Date: Sun, 7 Jun 2009 21:47:05 -0500 > From: Brian Lanning <brianlanning at gmail.com> > On Sun, Jun 7, 2009 at 9:41 PM, Cameron Kaiser<spectre at floodgap.com> > wrote: >>> > Quadra 700 > I could easily be wrong. It might be 4 4s instead of 4 1s. The Q700 has 4 MB soldered to the logic board and four 30-pin SIMM sockets. So the minimum RAM is 4 MB unless someone has been stealing chips off of the thing. With four SIMMs installed, it should have at least 8 MB, although if 256KB SIMMs were supported it could be as low as 5 MB. I don't remember if they were. It supports up to 16 MB SIMMs, so the maximum RAM possible is 68 MB. Its big brother, the Quadra 900, supports up to 256 MB of RAM with sixteen 30-pin SIMM sockets. Pretty good for a computer from 1991. Jeff Walther

16 years, 1 month

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test-drb June 2009