test-drb February 2014

test-drb@ccmp.vtda.org

191 participants
208 discussions

by hp-fix＠xs4all.nl

Simon, Die checked the filter elco's. You should check the leakage current and ESR values. If the mosfet is running hot you should check the board for shortcuts. Tantalum caps have a habit of getting shortened when they get aged. Also a not working driver can cause a large current, this can be checked with a scope. Check the signals at the base of the drive transistors. I suppose you checked the voltages for ripple and noise. -Rik -----Oorspronkelijk bericht----- Van: "Simon Claessen" <simski at dds.nl> Verzonden: ?13-?2-?2014 10:00 Aan: "On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Onderwerp: Re: LA12 correspondent On 12-02-14 23:18, Tony Duell wrote: > In whuich case it's almost certainl the right sort of part. My > experience suggests that SMPSUs fail for may more trivial reasons than > having a MOSFET fitted in palce ofr a bipolar transistor. > > The mosfet runs hot, even with the original cooling, and the paper is not advancing, so there must be something wrong somewere else in the machine. I actually would love to find out what type of transistor was there originally relabeled as digital part # 151278200 -- Met vriendelijke Groet, Simon Claessen drukknop.nl

10 years, 7 months

Anyone have any use for SCSI CD drives?

by lproven＠gmail.com

I have 2 for sale - starting at 1p, which is under 2? and the lowest eBay will let me set. As before, if no sale, free for the postage. Yamaha CRW4416SE CDRW, SCSI 2 http://www.ebay.co.uk/itm/271399508349 NEC CDR500 / Multispin 3x http://www.ebay.co.uk/itm/271399524488 Also a symmetrical PC joystick for left-handed gamers as well as right-handed ones http://www.ebay.co.uk/itm/271399535952 -- Liam Proven * Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk * GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com * Skype/AIM/Yahoo/LinkedIn: liamproven Tel: +44 20-8685-0498 * Cell: +44 7939-087884

10 years, 7 months

windows 98 pc

by rmx44＠aim.com

hello all. i happen to have a dell optiplex gx50 and i got 98 on it and when i started installing stuff to it i got so far then the os stopped booting at all and black screened. i wish i could find a good windows 98 computer or setup. if anyone could help out let me know

10 years, 7 months

[u-u] Someone's looking for old software

by johnwallace4＠yahoo.co.uk

>Date: Wed, 12 Feb 2014 08:43:43 -0500 > From: allison <ajp166 at verizon.net> > To: cctech at classiccmp.org > Subject: Re: [u-u] Someone's looking for old software > Message-ID: <52FB7A8F.4080306 at verizon.net> > Content-Type: text/plain; charset=ISO-8859-1 > > > >> Will VAXELN even run on a 3100 or a 4000? I > thought it was limited to Q-Bus > >> systems, but won't be surprised if I'm wrong. > >> > > > > It runs on any VAX. However its not a OS. Its > closer to a IO subsystem > and scheduling > package (RTOS). Like many RTOS packages the basic > system is fairly > useless and not > a user environment. Its used to make real time > systems. Examples that > used it were > LPS40(qbus), LPS20(not Q), LPS32(not Q) and the terminal > software for > the VS2000 > (very not Q). If the bus/IO structure is not Qbus or > other DEC standard > bus then IO > is up to the developer. > > Allison VAXELN is/was a host/target setup for developing distributed realtime VAX applications (ELN = Executive for Local Networks). Hosted on any sensible VAX/VMS system, with targets being a subset of VAX, MicroVAX, VAXstation systems. And a few oddities too (e.g. RTVAX300 VAX-in-a-module, KAV30 RTVAX300-on-VMEbus, rtVAX1000 (KA630-variant in a MicroVAX2 chassis), etc. Obscure targets without publically available VAXELN support (?) include the aforementioned LPS32 and LPS40 VAX-powered printers. The SPD seems to be hard to find online, as does the VAXELN Technical Summary, so what follows is from memory. The usual suspects do seem to have some of the VAXELN docs online in decw$book format. The host and target might be separately licenced. Early VAXELN applications could be written in a multi-threaded variant of PASCAL called EPASCAL. Later, other standard VAX languages were supported too: Ada, C, maybe Fortran, the usual Pascal. Or VAX Macro. The runtime environment was a dedicated RTOS environment, not VMS (e.g. no demand paging) although some VMS-compatible facilities (DECnet, RMS) and routines (some LIB$)were offered. You compiled your application in the usual way, and linked it with VAXELN-specific libraries using the usual linker. The VAXELN system builder was then used to build a bootable system image. A system image would include the hardware-specific kernel and any required VAXELN device drivers. Any optional facilities (VAXELN distributed name service, networking using DECnet and/or TCP, CLI, Xserver, debug) would be combined with any required user applications to make a bootable system image file Booting was supported over the LAN (MOP, maybe bootp), from disk, and in an odd few cases, from ROM. A VAXELN source kit was sold at one stage, though it was far from essential. Pretty much the whole target end was written in PASCAL. In the early days VAXELN had its own threads-aware debugger (hosted on VMS and networked to the target). Once VMS DEBUG got that capability (which came initially with DEC Ada? sometime around VMS V4?) VAXELN targets could be debugged remotely using the standard VMS debugger. Deep joy. Iirc, VAXELN V4.3 or thereabouts used to be on CD in the 1990s (1993?). There were a couple more versions after that, but no huge changes I can remember. When Alpha came along, VAXELN was left behind. DEC worked with Wind River to get a version of VxWorks for Alpha (VxWorks was an "industry standard" RTOS, somewhat different in concept to VAXELN). Both claimed to have POSIX compatibility for the RT stuff. A thin VAXELN veneer was added on top of VxWorks for those who might be interested. The product became part of DEC's Embedded+Realtime Group, which was sold off to SMART Modular Technologies, in the late 1990s (?), and the product subsequently vanished. I haven't recently been able to establish the product's current status, though I didn't try real hard. It was a great RTOS if you wanted to think more about the application design and less about the intricacies of device drivers and networking and other such traditional RTOS trivia. I'm told its concepts mapped nicely onto the "channels and pools" from "Communicating Sequential Processes". Be interesting to know what lies behind the original enquiry from LinkedIn. I may be able to offer more info if necessary. It might not be quick, and the formatting may be messed up again (sorry). Hope this helps, regards John

10 years, 7 months

[u-u] Someone's looking for old software

by cctech＠beyondthepale.ie

> >Will VAXELN even run on a 3100 or a 4000? I thought it was limited to Q-Bus >systems, but won't be surprised if I'm wrong. > I have come across a VAXELN image for a VAXStation 2000 which I think implemented some sort of X Terminal on it. (While not Q-Bus based, at least some of the VAX 4000 range do have facilities attach Q-Bus periperals.) Regards, Peter Coghlan.

10 years, 7 months

Infotek MF-300 1Meg -FP68881 Memory Card

by shutchman＠gmail.com

Does anyone have the setup and documentation for this MF-300 CCA? I would like to install it in my HP9836C and run the Infotek BC204 Basic Compiler , but I do not have any info on how to set the DIP switches.( there are 9 switches. -- e-?

10 years, 7 months

DEC VT101

by cctech＠beyondthepale.ie

> >I have a box of them, used, along with the monitor boards and almost all >vt1xx logic boards. I have some of the boards handy, but the rest I won't >be able to dig out for a while due to more pressing personal priorities. I >will post when I find them. > Hi Paul, I have been looking for a flyback transformer for a VT220, part number 16-26299-01 (or possibly 16-21181-01 which appears to be the same thing with a different mounting arrangement). I would appreciate if you could keep a lookout for one of these when you are searching. Regards, Peter Coghlan.

10 years, 7 months

Booting OS/8 on a PDP-8/E from a PC

by kylevowen＠gmail.com

Greetings, I've been hard at work on an OS/8 system handler that negotiates block transfers between a PC running a special disk server. The two are currently working great! I was able to use the BUILD utility to make my own OS/8 V3D disk and boot from it. I then thought that it may be possible to take an existing RK05 image and replace the bootloader and system handler with my own. Sure enough, it works! Check it out: https://www.youtube.com/watch?v=YkqVJ6ShV5A I'll be releasing the source code for all of this within the next few weeks as I make minor changes (and mostly tidy it up). A few details: the handler resides in one page and talks to the server to negotiate the transferring of pages. To keep the handler small, I'm offloading as much stuff onto the PC as possible. There's no error detecting (although this hasn't been an issue for the millions of bits I've sent thus far) and the features of the handler are pretty basic. The disk server is written entirely in C and has been successfully compiled on Mac OS X and Windows under Cygwin. The handler sends serial data to an M8650YA (currently addressed at 40/41, the aux TTY addresses) operating at 19200 baud. This is pretty slow still, as you can see from the video. But it's usable! And it's bound to get better with a few more improvements. To bootstrap the system, the RIM loader is toggled in as the primary bootloader, and a secondary bootloader is sent in RIM format. Start the system at 0020 after that, and it'll boot right up. In summary, anyone with a spare M8650, M8655, or other serial card can now boot OS/8, even if you don't have an RK05, DECtape, RX01/02, etc.! If you have a parallel I/O card, another handler could be made for even faster transfers, I imagine. This would require some extra hardware, though. Let me know if you have any questions. Again, I'll see about distributing the source in a couple of weeks, or as I have time. Kyle

10 years, 7 months

VCF Southeast 2.0

by blstuart＠bellsouth.net

Vintage Computer Festival Southeast 2.0 May 3,4 2014 The Atlanta Historical Computer Society and the Computer Museum of America are pleased to announce the second annual Vintage Computer Festival Southeast. We have selected the 3rd and 4th of May to make it easy for people to attend both VCF East and VCF Southeast this year. The venue will be the same former CompUSA store in Roswell GA as last year. This year's exhibit space will be greatly enlarged over last year, occupying the whole retail space of the store. About 2/3 of the space will be the exhibition LINK ? Personal Computing from Switches to Pockets. The exhibit is a journey from the present back to the Kenbak-1. The remaining 1/3 of the retail space will contain hobbyist vintage computing exhibits. For those who missed last year or who would like to see it again, the Apple Pop-Up museum from last year's festival will again be available. The popular retro-gaming area and introduction to soldering activity will be available again. This year, we are also working to bring in a number of vendors, assemble a stellar slate of speakers, and offer workshop experiences. Of course, the kids' scavenger hunt will be back this year too. More details as they become available. Hope to see you all there.

10 years, 7 months

FREE: Bernoulli Box - SCSI dual 90 - B290X-UNI - located in So Cal.

by tosteve＠yahoo.com

Located in Orange County, CA 92656 Free for the cost of shipping. Working condition unknown. No carts included. See pics here: http://bitpig.com/temp/bernoulli-1.jpg http://bitpig.com/temp/bernoulli-2.jpg

10 years, 7 months

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test-drb February 2014