test-drb

test-drb@ccmp.vtda.org

101090 discussions

by aperry＠snowmoose.com

I recently picked up a Rainbow 100. The PVA between the safety glass and the CRT on VR201 that came with it has broken down and failed badly. I have seen videos and read about removing the safety glass, cleaning out the PVA, and reattaching and resealing the safety glass. All that I have seen basically sticks the safety glass on at its edges and leaves a void where the PVA had been. It seems to me that the PVA was providing some implosion protection. Would it work to replace the PVA and attach the safety glass to the tube with an optically clear adhesive sheet? I have seen that this exists, but have never used it before. Also, I have never worked on a CRT before. I am trying to find a local person who can observe me and stop me from doing something stupid. If I can?t find someone, what am I more likely to do wrong? How can I be sure I discharged it before touching it? Finally, a VR201 specific question. I booted the Rainbow over the weekend and, looking through broken-down PVA, I could see the Rainbow has booted and I could enter DOS commands. I could also see white retrace lines. What is the likely cause of that on a 35-year-old CRT? alan

7 years, 8 months

Sun Optical Mouse and pad

by technoid6502＠gmail.com

I had a Sparcstation 4/330 with optical mouse, without the pad. Of course I wanted one, and eventually found one, but in the interim, I did what an old hack suggested and printed myself a grid on paper. Works peachy. The spacing of the grid will determine the tracking speed of the mouse. Graph paper works if you get a fine grid. Try .5cm. Just to get you on the road til' your pad gets to you. My old hack told me they had a problem with the pads disappearing and had a file on their network for folks to just print themselves one for the day. Jeff

7 years, 8 months

UniBone - access DEC PDP-11 UNIBUS under Linux

by j_hoppe＠t-online.de

Guys, I'm about to finish another project: "UniBone" - a Linux-to-UNIBUS bridge, based on the BeagleBone Black. It is supposed to be a development platform for device emulation. At the moment it can emulate memory, emulate an RL11 controller with 4 RL drives attached, and act as UNIBUS hardware test adapter. There are some web pages at http://retrocmp.com/projects/unibone And I'll show it on VCFE.CH in Zurich on Nov 24/25,? plugged into a PDP-11/05. Enjoy, Joerg

7 years, 8 months

DEC Professional 350 ROMs

by robert.jarratt＠ntlworld.com

I have some ROMs from two DEC Pro 350s I want to image. My programmer fails to identify them automatically. From the technical manual it would seem that they are two 8K ROMS in a DIP24 package. I have tried to pick some other model of ROM and read them, but I am not convinced I am reading them correctly as a result (top 4K all 1s). Here are the markings. On one pair the ROMs are Motorola and one of them is marked LM8450 254E4 SCM 90448C ID8402 On the other pair one of them is marked: /B8250 MM51264KXL/N 23-115E4-00 TP-03 And the other is marked: Mostek 8252 MK36C25N-5 23-116E4-00 TP01 I know that in all cases the last line is just an ID for the actual contents and the last two have a DEC part number in the penultimate line. I have found that using Motorola MCM68766 seems to read the ROMs from one of the machines and I don't get verification errors when I try to read them back again a few times, although the contents don't seem to have any recognisable strings. Using Motorola MCM2716 gave me fewer bytes (of course), but there seemed to be recognisable strings too. The other pair of ROM chips from the second machine always give verification errors. I don't know if they are bad, or if it is just timing problems given that I am not using the right parameters for the ROM chip in the first place. Can anyone point me at a datasheet that might describe these ROMs, or at least what they might be equivalent to so I can set my programmer accordingly? Regards Rob

7 years, 8 months

Looking for optical grid mouse pad

by camiel.vanderhoeven＠vmssoftware.com

Hello everyone, A week ago, I took possession of a second Ardent Titan graphics supercomputer, and unlike the other Titan, this one is almost complete. There is one tiny bit missing, and that is a mouse pad. The mouse used with this systems is a Mouse Systems M4 variant (M4Q), and it does not appear to be a normal serial mouse. So, if anyone has one of those reflective mousepads with a grid of fine blue and grey lines that they don?t need, I?d be very happy to have it. I have tried to print my own mousepad, but the mouse only works in the y direction on it. For those who want to know, the Titan is outfitted as follows: 2 x Titan P3 vector processors (using a MIPS R3000 for scalar operations) 2 x 64 MB main memory Extended G2 Graphics 3 Maxtor 760 MB disks QIC-120 tapedrive 19? trinitron monitor with stereo bezel and 3d glasses Keyboard, mouse, knob box Titan OS 4.2 installed (plus version 3.0, 4.1, and 4.2 installation tapes) Dore, AVS, and PHIGS+ graphics environments Vectorizing FORTRAN compiler with LINPACK, EISPACK, and FFT libraries Matlab-Pro 3.5 (the Titan was the only computer ever that had Matlab as part of its bundled programs) Biodesign Biograf 3.0 molecular modeling application All bits and pieces, and all software appears to work. Camiel

7 years, 8 months

Teletype cheap

by billdegnan＠gmail.com

https://www.ebay.com/itm/Teletype-Machine-Model-3320-3WA-Teletypewriter-AS-… b

7 years, 9 months

Teletype cheap

by jfoust＠threedee.com

At 07:49 PM 11/24/2018, Bill Degnan via cctalk wrote: >I suggested a shallow box does not have to be so tall. > >On Sat, Nov 24, 2018, 7:56 PM Steve Malikoff via cctalk < >cctalk at classiccmp.org wrote: > >> >> > I wonder if anyone made a 3d printer file for a 33 chad box? >> > Dwight >> >> ...working on it :) I believe John Toebes was talking about 3D printing a chad box on the Greenkeys list a month or so ago. - John

7 years, 9 months

Bluebox AVR boards available

by dave＠661.org

I've finished my work on designing and debugging a PCB to go with my AVR-based bluebox program. Read about it and buy one at https://661.org/proj/bluebox/. This project implements a bluebox in C on AVR microcontrollers. This project is roughly a reimplementation of Don Froulas's PIC-based bluebox, which was written in PIC assembly. The resulting compiled program is intended to be loaded into one of the following circuit boards. Currently the code implements a bluebox, silver box (DTMF dialer with 4th column), redbox, greenbox, and 2600hz pulse dialer. There are 12 memory locations of 41 keystrokes each. -- David Griffith dave at 661.org 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?

7 years, 9 months

What is this?

by cctalk＠emailtoilet.com

Don't think it is IBM. Apparently high temp ICs due to the heat sink housing. No idea what it is. http://www.myimagecollection/part

7 years, 9 months

Text encoding Babel. Was Re: George Keremedjiev

by guykd＠optusnet.com.au

Resend, just in case that screen-cap image attachment fails. It is also here: http://everist.org/6F2a/cctalk_rcvd.png >Will require >some way to compare mailboxes in search of pattern in missing >emails... Which may or may not be obvious... which will lead to more >puzzles... oy maybe I should have stayed muted and let others do the >job... Here's one check. See attached screen-cap of cctalk emails. Usually many per day, but only one per day on the 15th & 16th Nov, none at all on the 17th. Did the list actually go silent then? It's possible by random ebb and flow, or maybe everyone was in shock over the awful Paradise fire death toll. Which may be over 1000, unless a lot of people listed as missing do turn up. Guy

7 years, 9 months

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