test-drb

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101090 discussions

by cctalk＠snarc.net

The pre-production Apple 1 auctioned via CharityBuzz and displayed at VCF West closed just now for $1,210,000. Blows away the old record of $900-something. Amazing!!!

9 years, 5 months

RQDX3 disk image for Gesswein's MFM emulator

by chd＠chdickman.com

I am looking for an RQDX3 compatible disk image for Dave Gesswein's MFM disk emulator. I don't have a functional disk to image and the ZRQCH0 won't cooperate.

9 years, 5 months

PATA HBA and drive wanted

by t.gardner＠computer.org

Hi: I'm looking for a PATA host bus adapter card (either ISA or PCI) and a PATA drive preferably UDMA/33 but no later than UDMA/100. This would probably come from a system built in the mid-1990s before the PATA interface got embedded into the chip set. It might even be from an older system that was upgraded by replacing an ST412 HBA and drive with and EIDE HBA and drive. Will rent, buy or borrow as appropriate Contact me off line Tom Gardner (650) 941-5324 t.gardner at computer.org

9 years, 5 months

PDP-8 diagnostic tests

by scott.l.baker＠gmail.com

Hi, I have written a PDP-8 VHDL model and I have it running in an FPGA https://github.com/scottlbaker/PDP8-SOC At this time it has passed a basic DEC diagnostic instruction test but I found some interesting things when getting that instruction test to pass. For example: The following segment of code implies that IAC instruction affects the Link bit 1797 /GROUP 1 OPERATE TEST 33 1798 02626 7300 CLA CLL /AC=0000 LINK=0 1799 02627 1053 TAD K2525 /AC=2525 1800 02630 7261 CLA CMA CML IAC /TEST COMBINATION 1801 02631 7420 SNL 1802 02632 7430 SZL 1803 02633 7402 HLT /CLA CMA CML IAC FAILED, AC SHOULD 1804 /BE 0000, LINK SHOULD BE ZERO but the PDP-8 Handbook ; DEC copyright 1966; page 14 says nothing about the Link bit being affected by the IAC instruction. The simh PDP-8 simulator also shows that L is affected by IAC. If I change this test line from 1800 02630 7261 CLA CMA CML IAC /TEST COMBINATION << link=0 to: 1800 02630 7261 CLA CMA CML /TEST COMBINATION << link=1 Can anyone point me to: 1) DEC documentation which more fully describes all the instruction set (in more detail than the PDP-8 handbook) 2) Some more instruction tests in assembler source code format. I have found lots of binary files but I would prefer assembler source code format. I am using a pal compatible cross assembler. Thanks and Regards, Scott

9 years, 5 months

"Unix Implementation" paper in HTML

by jnc＠mercury.lcs.mit.edu

So, I'm hoping someone can help me with a minor mystery. At same point, I ran across, and saved, this: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/BSTJ_July-August_1978.htm which is a very nice HTML recreation of the famous first BSTJ Unix issue. Notice that it contains links to online HTMl versions of two of the papers; the basic Unix paper (the one that was famously in CACM), and "UNIX Implementation" by Ken Thompson. Alas, I appear not to have downloaded and saved the 'Unix Implementation' paper; I have searched high and low on my machines, and no sign of it. Double alas, because it doesn't seem to be online anywhere either! I have found a PDF version online, and also the NROFF source, but not this HTML version. I just don't recall exactly where I found this, so I can look in the Wayback Machine for the HTML. I _thought_ it might have been from Ken or DMR's Web page, so I found both of them in the Wayback Machine, but in sampling them both over the years, neither one seems to have had this. (And the Wayback machine doesn't have a search function that I know of, to search for it directly.) So does this page ring any bells for anyone, or alternatively, has anyone saved the HTML version "Unix Implementation"? (Yes, I know it's no biggie, with the PDF version available, I'm just being anal.... :-) Noel

9 years, 5 months

Turbo Pascal v3.01a for CP/M...

by geneb＠deltasoft.com

I'm looking for a copy of Turbo Pascal 3.01a for CP/M - specifically a disk image. I know there's tons of copies in individual-files-in-a-zip form, but I'd like to get an original disk image. (I've got a problem with TINST on one of my machines and I want to ensure it's not bit rot on the behalf of TINST or the data files it uses.) Disk image format isn't that important as I can use various tools to extract the files. Zipping up the files from an original disk would work as well. Thanks! g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://scarlet.deltasoft.com - Get it _today_!

9 years, 5 months

PDP-8/i Panel Pics

by rodsmallwood52＠btinternet.com

Hi Guys I sent out a photo of the new PDP-8/i with a real one for comparison to everybody who might be interested. If you did not get the email and would like one please let me know Rod (Panelman) Smallwood

9 years, 5 months

Differences between the PDP-11/15 and PDP-11/20

by jnc＠mercury.lcs.mit.edu

> From: Paul Popelka > I was wondering how much delay the KT-11B introduces. That's a _very_ interesting question; AFAIK, the documentation doesn't say. If there's a cache miss, of course, there's one memory cycle delay to load it. If the cache hits, though, there's still added gate delays going through the KT11 - perhaps 20-30 or so (to make a complete guess) - at ~10nsec each, that would be an extra 200 nsec per memory cycle. Not insignificant... > There is still the actual implementation of the KA11 changes that can > be reverse engineered if someone is so inclined. Well, that might not be trivial - if the boards have ECOs, it may be hard to tell them from the KT11 changes. The sheet which gives the wiring changes for the KA11 backplane _is_ still there - although there are indications on it that the actual machine differs from the prints! Wheee! :-( Noel

9 years, 5 months

BEL constant in MAINDEC-8E-D0AB-PB

by pontus＠Update.UU.SE

Hi I've been running and looking at the PDP-8/E INSTRUCTION TEST 1. And it is supposed to write the BEL (07) character after each round of passed tests. However the code loads and outputs the constant "0207", which is 07 with the eigth bit set. I think the 8/E serial interface outputs all eight bits in this case? I suppose a real ASR-33 would ignore the eight bit? Why does the code not load 07? Thank you, Pontus.

9 years, 5 months

DEC Indicator Panels page

by jnc＠mercury.lcs.mit.edu

> Oooh, thanks ever so much for turning that up!!! OK, I have added them to the page - I lost a little resolution rotating them to be level, but there's still more than enough to recogize them, and mostly read them. > So that mystery panel seems to be a general panel, more associated with > the CPU than anything else; one line does seem to be the reader, but > one quadrant is the KT15 memory management, one is the KA15 priority > interrupt system, and there's general CPU/system stuff throughout With that, I think we have most of the PDP-15 panels (although the VT15 image is still pretty crummy). That leaves only these two: http://www.simulogics.com/nostalgia/DEC/15_05.jpg although that looks like early marketing material, so perhaps those panels neve made it into production machines? I wonder if one of them is a BD15 (whatever that might be) - or if that's the name for the CPU panel (above)? Noel

9 years, 5 months

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