test-drb February 2017

test-drb@ccmp.vtda.org

153 participants
189 discussions

by systems.glitch＠gmail.com

IT LIVES! I spent most of today hacking on the 560Z board. I got the 12-bit porthole going first, took a bit as the manual doesn't tell you that you need IC CC installed if you want to be able to write to the 4K exposed in the porthole. After that, I plugged in a Z80 and tried to get it running the test code in the manual. Turns out I had a dud Z80 :) With a good one installed the test code ran no-problem, as did a little hand written code to push data to the lamp register on the new memory board. I plugged in an IM-6100 and pretty much determined that at least the first one I tried is dead. I'll recheck the soldering on it later -- it's stuffed into a machine pin socket and soldered in, since half of the legs were rotted off by that corrosive black foam everyone loves so much. Anyway, the second IM-6100 works! And the 560Z board works! And the 12-bit RAM board works! I made a (low-res, poorly focused) video with our old digital point-n-shoot: https://www.youtube.com/watch?v=ZYbGXHJST8U The IM-6100 is running a little loop that increments the accumulator and stores it to the lamp register. Storing of course clears the accumulator, but I have the lamp register mapped over RAM, so I just read the value back out of it. My first foray into PDP-8 code, it's certainly different, but it's still just machine code. Very happy that this seems to be coming fully together! Now if only I could find more IM-6100s...I'll test the remaining 3 tomorrow. Thanks, Jonathan

8 years, 1 month

LGP-30 Video Update

by COURYHOUSE＠aol.com

GREAT TO SEE PROGRESS! Keep up the good work Cory! yes, heads have to be close to work.. at least that is the way it was with the VRC drums for storage on the GEPAC process control systyems Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 2/25/2017 7:24:30 P.M. US Mountain Standard Time, coryheisterkamp at gmail.com writes: Some promising news on getting the LGP-30 up and running. With all systems stable, I tightened the head spacing on the three timing track heads (using brass 0.001" feeler gauges though I may have to go closer). This has resolved 'hanging' when hitting Start; it actually appears to execute for a cycle before toggling back to Stop for each press of the Start key. Of course without being able to see what's happening, it's likely just 'executing' garbage, but it's a solid first step. In Manual mode, keystrokes from the Flexowriter now trigger a Stop/Compute toggle for each key entered and status neons on the flip-flop cards are registering unique bit patterns as each comes in. I put the scope on the (rebuilt) clock generator card and we have good 'T' and 'T-bar' signals propagating, but still haven't licked the 'digital display' issue. After further probing, the display began to stabilize and the single line expanded into the proper 3 for Counter, Instruction and Accumulator, and eventually a bit pattern emerged for the Instruction. No signs of data yet for Counter nor Accumulator, and there is an extremely pronounced 'throbbing' and visible refreshing. Here's a video: https://youtu.be/Nhya46V-l70 System timing looks spot on (top trace), but I also see some 'throbbing' when putting my scope on any of the three timing heads which seems a little strange to me (example on lower trace). Here's a quick vid: https://youtu.be/JjRKDWVUyjA One thought is that the timing and short register heads are still too far off the drum surface for a solid signal, purely conjecture at this stage. -C

8 years, 1 month

HP 2647F cable

by COURYHOUSE＠aol.com

I have a 2647 or a 2628.. ( has cassettes in it) I thought there was basic for it... neat.. how do we generate the tape to load it? Bet the rollers in the drive are toast? details? thanks ed# In a message dated 2/25/2017 4:46:10 P.M. US Mountain Standard Time, mloewen at cpumagic.scol.pa.us writes: On Sat, 25 Feb 2017, Dave wrote: > Also, the online documentation indicates that there is supposed to be a > "BASIC/Autoplot/47" disk, but I only see an "Autoplot/47" disk among the > included floppies. Is this likely to contain the BASIC as well, or am I > missing a disk? I'd be interested in any software anyone may have for > this machine. The HP Museum site has a ZIP file available for download that has 3 disk images: http://www.hpmuseum.net/display_item.php?sw=306 Mike Loewen mloewen at cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

8 years, 1 month

LGP-30 Video Update

by coryheisterkamp＠gmail.com

Some promising news on getting the LGP-30 up and running. With all systems stable, I tightened the head spacing on the three timing track heads (using brass 0.001" feeler gauges though I may have to go closer). This has resolved 'hanging' when hitting Start; it actually appears to execute for a cycle before toggling back to Stop for each press of the Start key. Of course without being able to see what's happening, it's likely just 'executing' garbage, but it's a solid first step. In Manual mode, keystrokes from the Flexowriter now trigger a Stop/Compute toggle for each key entered and status neons on the flip-flop cards are registering unique bit patterns as each comes in. I put the scope on the (rebuilt) clock generator card and we have good 'T' and 'T-bar' signals propagating, but still haven't licked the 'digital display' issue. After further probing, the display began to stabilize and the single line expanded into the proper 3 for Counter, Instruction and Accumulator, and eventually a bit pattern emerged for the Instruction. No signs of data yet for Counter nor Accumulator, and there is an extremely pronounced 'throbbing' and visible refreshing. Here's a video: https://youtu.be/Nhya46V-l70 System timing looks spot on (top trace), but I also see some 'throbbing' when putting my scope on any of the three timing heads which seems a little strange to me (example on lower trace). Here's a quick vid: https://youtu.be/JjRKDWVUyjA One thought is that the timing and short register heads are still too far off the drum surface for a solid signal, purely conjecture at this stage. -C

8 years, 1 month

VIC 20 in film

by spacewar＠gmail.com

Anyone else notice it in _John Wick Chapter Two_? I don't recall having ever seen a VIC 20 in a mainstream film before.

8 years, 1 month

VIA SMECC __ PART 1 RTTY Journal A Gift to all of us From Bill Henry

by COURYHOUSE＠aol.com

LINKS FOR DOWNLOADING THE RTTY JOURNAL AND FOLLOW ON PUBLICATIONS FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILES FROM THIS SECTION ONLY Thanks to Bill Henry of HAL for putting these into the public domain for all to enjoy. These are ZIP files which will break down to individual issues. They are presented in groups like this to enable easier and quicker downloading. Dates are in filename! These files below represent all of the RTTY Journal that were collected into a set CD-ROMs by Bill Henry K9GWT the owner and most recent publisher and Wayne Matlock, K7WM (SK). These journals represent 50 years or RTTY history in the Amateur Radio Field and along with the ARTS journals (an east coast publication) at SMECC represent a truly fantastic study of Amateur RTTY. The RTTY Journal was first published by the Southern California Radio Teletype Society as the RTTY Bulletin in January 1953. Over the years, the name has changed to RTTY Journal, RTTY Digital Journal and The New RTTY Journal. Past editors included Dusty Dunn (W8CQ), Don and Dee Krumpton, Dale Sinner W6IWO, Jim Mortensen N2HOS (SK) and Bill Henry. Thanks to Chen K7AY and Jay WS7I for distributing these. You will want to pull all of these down and expand them on your hard drive - then, you have the entire publication run as it evolved!. Enjoy! I am spending hours reading these! Ed Sharpe archivist for SMECC FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILES FROM THIS SECTION ONLY _www.smecc.org/media/rttyjournalzip/1953-1962.zip_ (http://www.smecc.org/media/rttyjournalzip/1953-1962.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1963-1972.zip_ (http://www.smecc.org/media/rttyjournalzip/1963-1972.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1973-1977.zip_ (http://www.smecc.org/media/rttyjournalzip/1973-1977.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1978-1982.zip_ (http://www.smecc.org/media/rttyjournalzip/1978-1982.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1983-1987.zip_ (http://www.smecc.org/media/rttyjournalzip/1983-1987.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1988-1991.zip_ (http://www.smecc.org/media/rttyjournalzip/1988-1991.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1992-1994.zip_ (http://www.smecc.org/media/rttyjournalzip/1992-1994.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE _www.smecc.org/media/rttyjournalzip/1998-2003.zip_ (http://www.smecc.org/media/rttyjournalzip/1998-2003.zip) -FEEL FREE TO DISTRIBUTE THIS RTTY JOURNAL ZIP FILE

8 years, 1 month

SW tapes found today

by pete＠petelancashire.com

https://goo.gl/photos/edJN2M7AMsFFRL928 Tek 4050 some duplicates Apollo Model unknown Motorola MVME332XT Unused w/Tektronix Label Don't know the condition of the elastomer band. -pete

8 years, 1 month

HP 2647F cable

by dfnr2＠yahoo.com

> I wonder if this kryoflux supports this format. . . ?I got a kryoflux from another hobbyist but never tried it out. Obviously, Teledisk supports it, if it's in the HPmuseum archive. ? I suppose Imagedisk does as well. Dave

8 years, 1 month

story of Mel

by mark＠matlockfamily.com

> Without pulling the board out to double check how it is labeled it > must actually be a QG-640, not a QC-640. I was going from memory. > > This manual matches the board I have. > > http://www.bitsavers.org/pdf/matrox/265-MU-00_QG-640_User_Manual_Mar91.pdf Glen, The documentation link is exactly what I needed. Thanks!! It describes my QC-640 board exactly. It would be nice to have some drivers for it, but the documentation provides info on the pin outs for the connectors which I definitely needed. Thanks again, Mark

8 years, 1 month

HP 2647F cable

by dfnr2＠yahoo.com

Hi! I just picked up an HP 2467F on Ebay (best offer accepted), and received it yesterday. ?It seems to be in great condition, with all the original materials in the original packing. ?Unfortunately, the disk and cable were not included. ?I did manage to find the disk drive in a separate auction by the same seller, but have not yet received it. Would anyone here be interested in the original box and packing materials? ?Perhaps someone with a 264x series terminal who values having a box? ?It's all in great condition, and came packed in a slightly bigger box, so I could ship it out undamaged, if there are any takers. This is a neat little 8085 computer disguised as a terminal. ?It was introduced in 1978, according to the hpmuseum, but this one has a warranty card suggesting a 1982 manufacture date. ?This appears to have been sold in Germany by a German distributor. I'm looking for a cable. ?The manuals seem to have the information required to make one, but would rather locate an original if possile. ?If anyone has a spare, I'd be interested. Also, the online documentation indicates that there is supposed to be a "BASIC/Autoplot/47" disk, but I only see an "Autoplot/47" disk among the included floppies. ?Is this likely to contain the BASIC as well, or am I missing a disk? ?I'd be interested in any software anyone may have for this machine. Thanks! Dave

8 years, 1 month

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test-drb February 2017