test-drb

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101090 discussions

by michael.99.thompson＠gmail.com

> > Date: Mon, 19 Nov 2018 10:41:36 -0800 > From: Alan Perry <aperry at snowmoose.com> > Subject: Removing PVA from a CRT > > 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. > > alan > When we fixed the VR14 at the RICM, we were concerned about the safety aspects of removing the PVA and just using double-sided tape to hold the outer glass in place. We bought a thin sheet of Lexan at Home Depot, put the outer glass on a cookie sheet with the outside surface down, put the sheet of Lexan on top, and put it in an oven. When the temperature hit 420F (if I remember correctly) the Lexan softened and conformed to the inside of the glass. We trimmed the Lexan to size, reassembled the Lexan and glass to the front of the CRT, and glued the steel mounting band in place. It looks great, and is probably a lot safer than just leaving the PVA out. -- Michael Thompson

7 years, 9 months

VCF PNW 2019: Exhibitors needed!

by mbbrutman＠brutman.com

I'm trying to throw a party, but like any good host I'm worried about the food and entertainment and if anybody will show up. We already know there is no food at the museum so I need really, really good entertainment ... Right now we have seven exhibitors who have formally registered. We really need a total of 20 to 25 to make this work. We are still a few months away so I'm not in full scale panic mode yet, but I can feel it coming. ;-0 If you are interested in joining the party again, please register. An overview of what it means to be an exhibitor and the link to the registration form can be found here: http://vcfed.org/wp/vcf-pnw-exhibitor-registration/ . If you participated last year and don't want to do it again, I can understand that. To keep things interesting I'm trying to minimize the number of repeat exhibits. However, you can still help in a few ways: - Know somebody who should join the party? Talk to them about exhibiting at 2019. A little nudging and mentoring from a friend can make it easier to bring new people in. - Have an interesting topic you want to talk about? We're looking for speakers too ... - Can you volunteer a few hours? Many hands makes light work, and also gets you into the museum for the weekend for free. Have any leads on people I should talk to or ideas for making the show better? Send them along ... I'd be happy to discuss. One final note: Contrary to any previously sent communication, we are not "selling" spots ... I'm actively trying to get rid of the exhibitor fee entirely, and will guarantee that it will be no more than $20 this year if it is charged at all. Thanks, Mike VCF PNW President, CEO, and Executive Floppy Disk Shuffler

7 years, 9 months

What is windoes doing?

by dkelvey＠hotmail.com

I have a question. I use the USB port for serial. In my program, I use a fixed com port. When going to the control panel, I find that I see (in use) tags on some of the com ports. I'm the only one currently using the com ports but recently another (in use) showed up, requiring me to modify my program to use another com port. How does one unuse a com port? how do I find out what is using it so I can stop it? I'm using windows 7 professional. Has anyone else had this problem? Dwight

7 years, 9 months

HP-Apollo 9000/425t RAM

by cmhanson＠eschatologist.net

I?ve come into an HP-Apollo 9000/425t which uses memory boards with 72-pin headers rather than using SIMMs. Based on what I can see in pictures online, the boards themselves don?t appear to be anything special (they just carry TMS444000 etc. DRAM) and the connections aren?t anything special either, so I figure it shouldn?t be hard to design a SIMM adapter. Does anyone have or know where I could find the pinout and timings? -- Chris

7 years, 9 months

IBM 3270 Emulation Adapter (ISA)

by pat＠vax11.net

I'm wondering if anyone knows where to find a copy of some software to make an IBM 3270 Emulation Adapter (the short ISA one) useful. I hear that IBM's PCOMM/3270 2.0 - 4.0 or so will work (on DOS) with the card. Pat

7 years, 9 months

RT-11 DY install

by dstalk＠execulink.com

I'm trying to use a simulated RX02 disk (under simh) with RT-11 and can't seem to get the DY driver to install. Here's the relevant log: sim> set ry enabled sim> att ry0 ry0.dsk RY: creating new file RY: buffering file in memory sim> c .install dy ?KMON-F-Invalid device installation DL0:DY.SYS .dir dy.sys DY .SYS 4P 20-Dec-85 1 Files, 4 Blocks 14841 Free blocks I've tried with 2 different software "kits", the one from the simh site and the one from bitsavers. Any ideas? Thanks, Don

7 years, 9 months

early ANSI C drafts, pre-1989 standard

by spacewar＠gmail.com

I'm interested in looking at any published drafts prior to the C 1989 standard. I found X3J11-88-090 here: https://yurichev.com/ref/Draft%20ANSI%20C%20Standard%20(ANSI%20X3J11-88-090… That makes mention of the previous draft being X3J11-88-001. Does anyone still have a copy of that draft, or other pre-89 drafts? I'm not looking for any of the published standards (I've purchased them), nor any drafts after the 1989 standard. Eric

7 years, 9 months

Font for DEC indicator panels

by jnc＠mercury.lcs.mit.edu

> From: Paul Koning >> The DEC font uses a zero with a slash > For that, a capital O with a slash would probably serve. Actually, it turns out that only earlier panels (e.g. KA10, TC08, etc) use the slashed zero; later ones (KI10, RP11, etc) use the ordinary ones. Since our panel is intended for use with the RPV11-D, the unslashed is OK. Thanks to all for all the help with the font; did anyone have any comments on the _layout_ of the inlay (here: http://www.classiccmp.org/pipermail/cctalk/2018-November/043285.html for those who missed it among all the other messages). Noel

7 years, 9 months

HP 88780B density

by kevin.bowling＠kev009.com

I have a dual density 88780B. Is it possible to upgrade to quad density by acquiring/swapping boards? Or does someone have an 800bpi 9-track on SCSI Incan borrow or buy? I have a pair of 1984 pdp11/70 UNIX SysV (R0, R1?) tapes that need to be archived. Regards, Kevin

7 years, 9 months

TU58 tape formatter (was Re: rebuilding DC100A cartridges?)

by shadoooo＠gmail.com

Hello. I have a VAX730 with both TU58 drives destroyed (capstan melted, need replacements). I also have a bunch of cassettes, but unfortunately all seem to have problems with the bend and/or bad spots on the tape. Possibly I would try to replace the broken bands (if I find a source) and/or replace the magnetic tape when damaged (I was thinking to try with audio cassette tape, don' t know if metal oxide high density tape could be good for it). Anybody has some information about the coercivity of original DEC TU58 tape? One problem indeed is the need of reformatting the tape, but: if I can emulate the TU58 drive using a serial, would it be possible to send raw commands to the drive using the serial and a PC? Andrea PS-If possible, some good-condition cassette would be very useful to me too. I'm located in Italy.

7 years, 9 months

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