test-drb May 2016

test-drb@ccmp.vtda.org

202 participants
259 discussions

http://hackaday.com/2016/05/29/dragging-teletypes-into-the-21st-century

by COURYHOUSE＠aol.com

it converts codes send and recv... 5 to 8 8 to 5? can preprogram messages in stand alone mode and more... when I see things like this and giant 6502 my faith in things is renewed.... ed In a message dated 5/29/2016 6:52:04 P.M. US Mountain Standard Time, jws at jwsss.com writes: This is from what I see attempting to run a TTY from a system. As to the second, the tangent the author puts in is wrong, I don't know if an ASR33 can run 5 level easily, but all I've ever used are ascii 8 bit machines. thanks Jim

8 years, 1 month

http://hackaday.com/2016/05/29/dragging-teletypes-into-the-21st-century/?...

by COURYHOUSE＠aol.com

I will comment... make anything talk to a tty. The designer is wonderful. Keep him encouraged. I like to see people actually doing something ! We are implementing thee boards in some of our in house displays at the SMECC museum and several offsite journalism displays incorporating teletype machines.. Eric implemented several features we suggested that we needed for our mission. Glad to see the designer getting some credit. ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 5/29/2016 5:32:57 P.M. US Mountain Standard Time, cisin at xenosoft.com writes: On Sun, 29 May 2016, wulfman wrote: > I figured some of you might have had an interest. Excuse me if i was wrong. WITH a sentence or so of commentary. An email with NO content other than a URL and an impersonal signature, but no personal description, and with a subject line of the URL looks more like a malware offer than a mention of interesting content. We need SOMETHING to indicate that it is from YOU, rather than from crypto-locker. (and not just "Click on this!") Do you trust Thunderbird to reliably block those kinds of emails?

8 years, 1 month

AT&T 5620 (Blit/DMD) software

by lists＠loomcom.com

Hey folks, I recently picked up an AT&T 5620 terminal, the WE32K version of the Blit, and I've been tracking down software to run on my 3B2. It looks like there are two separate packages which provide the 'layers' windowing system: 1. A package named "AT&T Windowing Utilities", on one floppy disk. 2. A package named "DMD Core Utilities 2.0", on a set of three floppy disks. The DMD Core Utilities set comes with a lot of demos and source code. It installs 'layers' as /usr/dmd/bin/layers. The one-disk AT&T Windowing Utilities has no demos, and installs 'layers' as /usr/bin/layers. Can anyone elaborate on the difference between these two? Are they both appropriate to use with the 5620, and should I favor the DMD Core Utilities over the AT&T Windowing Utilities? Or are they both needed? Confused and lacking documentation, -Seth -- Seth Morabito seth at loomcom.com

8 years, 1 month

TU58 yet one more time.

by mattislind＠gmail.com

I have been fiddling with a TU58-EX device, dual TU58 drives in a small box. The capstans is replaced. I used silicone tubing which I glued on and then sanded down a bit. PVC tubing in a size that would fit seems to be unavailable in Sweden. The two capstans were a little bit different in diameter at first. Drive one closer to 17 mm but drive zero around 16.5mm. Drive zero read 5 of 8 tapes (two more tapes had belt breakage). One tape gave "Invalid Directory" in RT11 the two other gave "Error reading directory". On drive one just one tape was readable. So the decision was to get closer to the nominal 5/8" (which I read was the OD in a post by Tony Duell). With both drives at 16mm drive zero still read the same amount of tapes and drive one read the same tapes plus one more which was not readable on drive zero. Highly annoying. So I decided to read more on the TU58. The spec says that the bit time is 41.2 us. When I measure I get reading of between 42 and 44 us. (Yes I should have measured before trimming the capstans). So now the tape is too slow. Although the OD is slightly above the nominal. Is silicone tubing too soft? Having been working on a project to recover a tape from a Zilog S8000 machine together with AJ (http://mightyframe.blogspot.se/) I just thought that it might be possible to read the TU58 and HP DC100 tapes with some other hardware doing post processing in a regular Linux box. Would it be possible to use a Floppy Tape (QIC-117) tape drive to read them? It appears that the tapes are not identical in size. A DC1000 is 0.25 " while the DC100 is 0.15". The capstan position would also differ. Are there other physical differences that I am not aware off? Since the TU58 drive is not able to format a tape it could be useful to also write a new tape with TU58 format. But I guess that there are difference in coercivity between different tapes. I have read that Rik Bos successfully converted HP85 drives to take DC1000 tapes by modifying the capstan and changing the write current. Before I go ahead buying some old Colorado T1000 drive dirt cheap I just like to ask if this project is doomed because of whatever reason. /Mattis

8 years, 1 month

Mystery IBM processor

by malcolm＠avitech.com.au

Just wondering if anyone can help us to identify a rather large IBM processor assembly. It weighs around 60 pounds. The frame has a P/N of 34F5089. The frame houses 9 modules, 6 of which are installed. The module we removed for inspection has a P/N of 34F0615. Photos available here -> http://avitech.com.au/?p=561 Thanks, Malcolm.

8 years, 1 month

PC/AT "power good" problems

by radiotest＠juno.com

At 10:30 AM 5/29/2016, Dwight wrote: >Power to a load tester is not the same as power in a system. That is why I never use a load tester. I built a system with a set of adaptors that lets me measure voltage and current, and check for ripple and noise with an oscilloscope, for each output of a power supply while it is supplying the target system. Dale H. Cook, Roanoke/Lynchburg, VA Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640 http://plymouthcolony.net/starcity/radios/index.html

8 years, 1 month

PC/AT "power good" problems

by rich.cini＠verizon.net

All ? I pulled my old PC/AT off the shelf to see if I could get Windows 1 running on it (since I just located the Windows 1.04 SDK which I have running in Bochs). It worked when shelved years ago, but it unfortunately suffered some case damage from a leaky battery. No damage to the mobo or cards thankfully. I replaced the battery with a 4-AA pack. Basically, the PC won?t come out of reset. I tested the power supply with a load tester specifically for PC power supplies and it reports power_good and all voltages look good on a meter. So far, so good. I dug out my ISA POST diagnostics card which also has a PG tester in it. This reports no_PG but I do see the reset pulse on the bus. Not sure why one would report OK and one not. I have a spare generic power supply (which also tests good using the same tester) and produces the same result. I have no cards installed but I tried it with floppy/hard drives both connected or not connected. I traced the PG signal from the power supply through the 82284 clock driver/ready interface chip and the PG is definitely there (transitioning L->H on power-on) and RESET is transitioning H->L. Any recommendations on where to go from here? Does anyone have an extra PC/AT motherboard they would be willing to part with? As an aside, would this have been a typical development machine? AT was introduced in August 1984 and Windows 1.04 was released in 1987 so I?m guessing probably. Thanks! Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32

8 years, 1 month

Front panel switches - what did they do?

by swiftgriggs＠gmail.com

Since I'm an igmo about most machines before the mid-eighties (and still fuzzy even on most of those), I'm curious about all these older machines with front panel buttons and switches. What all did they do? You could actually program them using the front panel right? Some of them bootstrapped this way, too? What kind of "language" was used for that (ie.. what were the basic mechanics)? Did the buttons ever change color? Were you considered a badass if you had switch flipping all memorized down to an art? Were they mainly multi-position toggle switches or on/off buttons? They just seem to be a lot more important on older mainframes and minis. Also, what was the main reason for the blinkenlights? Was it to show system load or specific system states? Just curious. I'm learning a ton from reading these threads on older machines, but there is so much I don't know. -Swift

8 years, 1 month

Monster 6502

by jnc＠mercury.lcs.mit.edu

> From: drlegendre > Gawd, what a lovely piece of work that man hath wrought! I love the term he invented for it: "dis-integrated circuit"! :-) Good FAQ page here: http://www.monster6502.com/ My favourite entry: "Q: Are you nuts? A: Probably." Clearly a person after our own hearts! :-) Noel

8 years, 2 months

FFS - Fujitsu Sylistic, Toshiba TLCS 900L Development board

by rdawson16＠hotmail.com

I do not have the pen for the Stylistic. Its 386, I have booted a BSD / Xwindow environment on it, works. The Toshiba is a thru hole board with a prototyping area. Includes c compiler, assembler and the CMX RTOS on 3 1/4 floppies, power supplies, cables, from Softaid. Randy

8 years, 2 months

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test-drb May 2016