test-drb

test-drb@ccmp.vtda.org

101090 discussions

by roger.holmes＠microspot.co.uk

I am subscribed to the digests of the on topic posts. Sometimes I see follow ups to items which did sound interesting. Are the on and off topic digests swapped? Roger Holmes.

19 years, 11 months

crosscheck MK4564 DRAM against 4164?

by lee＠geekdot.com

> Could some kind soul crosscheck an MK4564-25IRL DRAM against a > D4164-2 for me? Everything I have says they are interchangeable. Lee.

19 years, 11 months

IC pin corrosion

by lee＠geekdot.com

> and about half the ICs in it are leaving some of their pins behind > when removed from sockets as they've corroded right through :-( This is not uncommon, I've seen it frequently on control systems that have all socketed ICs. It seems to occur most in the sockets that have one sprung leaf pressing against a flat side like this \| but also in other types where the socket contacts the pin surface. All these systems had been in constant use for more than twenty years. There were cases where we were getting intermittent errors reported and on pulling the cards we found at least one IC on each board with pins detatched. Hard plated pins, such as TI 74xx series seemed to suffer most with tin plated steel suffering the least. Lee.

19 years, 11 months

Cyril Yansouni?

by evan＠snarc.net

Anybody know where Cyril Yansouni is these days? He's the former chairman of Read-Rite.

19 years, 11 months

crosscheck MK4564 DRAM against 4164?

by julesrichardsonuk＠yahoo.co.uk

Could some kind soul crosscheck an MK4564-25IRL DRAM against a D4164-2 for me? I suspect that I can replace the former with the latter, but the various datasheet archives on the 'net are being spectacularly unhelpful in providing a spec sheet for the 4564's :-( I'm expecting that they're exactly the same pinout and organisation, and that the 4564-25's are 250ns parts and the 4164-2's are 200ns parts, so they're a drop-in replacement, but it'd be handy if someone can confirm that! Worst-case I can pull some 4564's off a spare board, but I'd rather use the box of 4164's that I have if they'll fit... cheers J. -- (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination.

19 years, 11 months

Anyone have a Teleram T-3000?

by evan＠snarc.net

It's a Z80 portable computer from 1982. I'm looking to buy or trade for one.

19 years, 11 months

Mac Performa needs home

by mtapley＠swri.edu

All, See below (read from the bottom, sorry for the mixed top/bottom posting. Sherry Fawcett (sfawcett at maine.rr.com) in Maine has a Performa that needs a new home. Suggestions welcome, please contact her directly. >At 18:44 -0400 7/14/06, sherrill fawcett wrote: >>Hi Mark - Thank you so much. I don't mind your putting the info out at all. >> >>Sherry >>On Friday, July 14, 2006, at 02:39 PM, Mark Tapley wrote: >> >>>Not immediately, but I am on a mailing list of classic computer >>>collectors. If you don't mind my posting your contact info to the >>>list, I'll be happy to forward your offer there, and either >>>someone on the list or someone known by someone on the list is >>>likely to speak for it. >Hi - I have a Performa (about 1994) that works fine, but I have no >room for it. I don't want to throw it away - would just like to >give it to someone. I'm in Maine. Do you know of anyone in my area >who might be interested? > >Sherry Fawcett -- - Mark Cell Phone: 210-379-4635 office: 210-522-6025

19 years, 11 months

Laser 128 please help

by compoobah＠valleyimplants.com

The Laser is a pretty perfect clone of the //c. I have no idea what they shipped with, but in elementary school we had them for half the lab. We just used standard DOS 3.3 or ProDOS disks in them when we needed the O/S. They have (AFAIK) the AppleSoft(like) basic in ROM (there may be some cross-polination with the IIgs machines that started trickling in and I used for more serious programming), so you can throw on one of the serial image download programs.

19 years, 11 months

Shipping a Diablo Model 31 disk drive

by wmaddox＠pacbell.net

I am having a Diablo 31 disk drive shipped to me. Can anyone advise on how to prepare one of these for shipment, for example, locking the head actuator? Thanks, --Bill

19 years, 11 months

Superbrain CRTC ROM board?

by julesrichardsonuk＠yahoo.co.uk

Hi, I've got a Superbrain here with a little ROM carrier board plugged into the CRTC chip socket on the Superbrain main board. The carrier board then contains a TMS2516 EPROM, the CRT8002B IC, and a 74LS08 chip. Is this something that someone's come across before? Looking at the ROM contents it looks likely to be a character table. Ideally what I'd like to do though is take the board out completely and put the CRTC chip directly back in the socket on the Superbrain's system board, as the carrier board's right in the way of some of the ICs I need access to in order to diagnose the fault with the system... cheers Jules -- (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination.

19 years, 11 months

chain printer speed?

by julesrichardsonuk＠yahoo.co.uk

Topic came up on a local newsgroup - anyone know what the typical speed of a chain printer was/is? I can't find any hard figures online - all the info about chain printers seems to just say they were "high speed" and that's it. Just curious! cheers Jules

19 years, 11 months

TRS-80 PT-210 printing terminal interfacing

by dgriffi＠cs.csubak.edu

I have a PT-210 printing terminal from Radio Shack. There's a slot for an rs232 serial connector adapter. Does anyone know anything about this adapter such that I can build one myself? How about schematics? -- David Griffith dgriffi at cs.csubak.edu 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?

19 years, 11 months

OT but surprising (although not really) - SGI

by compoobah＠valleyimplants.com

Am I reading their announcements right (https://support.sgi.com/login) that they are dropping not only MIPS but also all graphics systems (incl. Prism)? I guess it makes sense from a business standpoint - anybody can make an Itanium with a ATI graphics card, and VPro was a bit long in the tooth - but it's still a bit of a shock.

19 years, 11 months

Does anyone on the list have an ISOs or pointers to ISOs for a "New Internet Computer" (NIC)?

by ethan.dicks＠gmail.com

It's not quite 10 years old, but it's off-the-wall enough, I think, to fit in here. I have a NiC that I got when they were new. It's great, but somewhat orphaned. For those that don't know, it was a dictionary-sized Intel box, notable for its lack of a hard drive. Larry Ellison (of Oracle fame) intended it to be an Internet Appliance and Windows Killer. The company sold a number of the machines, but never made a big splash. They folded a few years ago, and took things like their Yahoo Group with them. What I'm specifically after was an ISO that someone came up with that would boot the NiC, then run entirely out of a RAM disk, allowing you to mount different CDs of music as a jukebox. I have a project I'd like to do and I think that would make a good starting point. I've been googling for NiC and disk images and such for a while and can't even find any of the once-available standard boot images for the NiC, let alone anything a little bit custom. Thanks for any tips. -ethan

19 years, 11 months

IEM-4400 (was Documentation for HP Nighthawk 20mb drive)

by vp＠drexel.edu

"Joe R." <rigdonj at cfl.rr.com> wrote: > Do you have ANY docs for the IEM dirve? I have several of their units > and I'd like to find out more about them. alas nothing. I have asked on this list before for any info on this thing, but I got no answers. **vp

19 years, 11 months

Laser 128 please help

by bob099＠centurytel.net

I picked up a Laser 128 at a flea market for $5. Got it home hooked up to video in port on tv, it booted a disc I didn't even know it had, a childrens spelling game. I have just exhausted my knowledge of the Laser and Apples in general, where can I go for more information? Anyway to create a system disc, without access to an Apple? Google provides an embaressment of sources about apple but much less about Laser.

19 years, 11 months

keyboard cleaning

by chrism3667＠yahoo.com

no wd-40 isnt a good lubricant (for certain tasks at least) but it is supposed to be a penetrant. I had thought that a subsequent wash of alcohol would remove *it*. Im contemplating submersing it in a watered down sudsy ammonia solution. Sudsy or probably even strait ammonia is the BEST stuph that Ive seen for getting at hidden crud, even better then acetone. You have to soak it for a day or 2 though. But it reacts with copper so Im concerned. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 11 months

*early* Domain OS available? ---> 8" floppy with Imagedisk

by kelly＠catcorner.org

> I've used a Shugart 801R with Imagedisk, and it works very nicely. I > laid out a small pcb to simplify the connections and could have more > made up if there were any interest. I would be interested. My wiring of the adapters looks like a bird's nest, but not wuite as organized. I did by an fdadap, but I could use some more adapters. What do you do for DS/SS sensing? I ended up using a small toggle switch. I use Tandon 848 double sided drives with imagedisk. They work very well, you just have to keep the heads clean. > > Dave Dunfield was invaluable in helping me work thru issues getting > single density to work properly. I ended up with an Adaptec ISA scsi > adapter card for the floppy controller which works well (it's > a 1522a). I can't say enough good things about Mr. Dunfield nor ImageDisk. I have made images of Tandy 2000 QD 5.25" disks, Tandy mixed density 8" disks, and PC compatible disks. What ImageDisk can't handle I save for the catweasel. Kelly

19 years, 11 months

Documentation for HP Nighthawk 20mb drive

by vp＠drexel.edu

ard at p850ug1.demon.co.uk (Tony Duell) wrote: > [...] it should be possible to make, say, a module with an HPIB port on > one side and SCSI on the other. It would respond to CS/80 or SS/80, and > talk to a normal SCSI drive. I am suprised nothing like this exists [...] Actually the IEM-4400 has a SCSI DAT tape drive and a board to interface it to HP-IB. I wonder if that board can be made to connect a SCSI *disk* to HPIB (probably need a new ROM though which will make the project more expensive than building everything from scratch). Regarding the HP Nighthawk drive I have one too (it was inside a 9153A box). When I bought the 9153A I assumed I'd find a standard drive inside (disappointed...). Once I saw the custom drive I decided not to bother with that drive (no way of repairing it, or recovering data stored on it). Unfortunately I was proven right, as the drive gave up the ghost. The Nighthawk drive now shorts the power supply. If you remove the hard disk, the 9153A powers up, but with the drive connected, nothing comes on, and a resistor on the drive begins to smell! :-( **vp

19 years, 11 months

Troubleshooting video

by compoobah＠valleyimplants.com

I'm not looking for a potted answer here - just ideas for where to look. Is ~28KHz a common HSYNC frequency? seems too low for anything I've seen. What else should I look at for a non-syncing monitor? USENET seems to indicate 48.8 KHz HSYNC on these old SGI monitors (SGI employee posting), so I'm not sure where the ~28 KHz is coming from- is this crystal or RC controlled? There are about 9 boards in the graphics half, I suppose sync is generated on the last one (in this case the DC4 display controller) - no crystals there. Common failure on old framebuffers? any tips? tony?

19 years, 11 months

Troubleshooting video

by chrism3667＠yahoo.com

here we go. No I wasnt aware of a ban on pc-talk here. And my point was 28kc is below even the hscan of comparitively low-res vga. --- cctalk-bounces at classiccmp.org <pat at computer-refuge.org> wrote: > On Sunday 16 July 2006 13:03, Chris M wrote: > > no, 28khz is not what you *should* be seeing. The > > original vga fixed frequency stuph ran at 31.5kc. > > Scott said: > > these old SGI monitors > and > > There are about 9 boards in the graphics half > > I don't know of any VGA controller that had 9 boards in it (or was designed to > hook to an old SGI monitor)... > > You do realize that the "stuff" we talk about on classiccmp are usually things > that aren't PC's, right? > > Pat > -- > Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/ > The Computer Refuge --- http://computer-refuge.org __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 11 months

keyboard cleaning

by chrism3667＠yahoo.com

the keyboard is for a NEC APC III. Some keys are intermittentsometimes. Other times theyre not. :D. I think Ill try soapy water and a splash of ammonia. Shaken not stirred. Next question - how does one scope out an 8048s code without enlisting the services of a soldering iron? I wouldnt be all that adverse to cutting a few traces. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 11 months

*early* Domain OS available? ---> 8" floppy with Imagedisk

by kelly＠catcorner.org

> From: cctalk-bounces at classiccmp.org > [mailto:cctalk-bounces at classiccmp.org]On Behalf Of Chuck Guzis >> On 7/15/2006 at 3:09 PM Fred Cisin wrote: >> > >GCR > >MFM without WD/IBM sector headers (Amiga) > >certain address marks > >with some FDC's FM > >with some FDC's 128 byte sectors > >damaged disks (both accidents and some copy protection) > > Also: > > Hard-sectored > "Strange" recording methods (e.g. OSI) > > --Chuck > Fred and Chuck seem to sum it up quite nicely. The "image" programs like teledisk and imagedisk are very limited in what they can image. What they do, they do very well, but they rely on a WD or WD emulated chip in the floppy control circuit. Since the current copyright standing of teledisk is not known to me, but that of imagedisk is, for these quick and dirty copies, I rely on ImageDisk. If I find images in teledisk, I write them out to physical media and re-read them into ImageDisk files. The catweasel does not rely on the WD style controllers. It can handle the "funny" address marks, hard sector disks, GCR, read and write FM formats reliably, and has a host of options for dealing with damaged disks. Just my $0.02... Kelly

19 years, 11 months

Troubleshooting video

by chrism3667＠yahoo.com

no, 28khz is not what you *should* be seeing. The original vga fixed frequency stuph ran at 31.5kc. --- cctalk-bounces at classiccmp.org <julesrichardsonuk at yahoo.co.uk> wrote: > Scott Quinn wrote: > > > > I'm not looking for a potted answer here - just ideas for where to look. Is ~28KHz a > > common HSYNC frequency? seems too low for anything I've seen. > > Hmm, I'd expect an SGI (or similar machine of its class) to be attempting > 1024x768 at 60Hz non-interlaced minimum, so hsync somewhere around 50KHz. > > > What else should I look at for a non-syncing monitor? > > Is it the monitor or the machine? For a monitor test I'd throw it on any old > PC and see what I could get out of it (wire up a sync combiner if the monitor > needs csync; easy to do) > > > USENET seems to indicate 48.8 KHz HSYNC on these old SGI monitors (SGI employee posting), > > Plausible, anyway. > > I suppose it's just possible that you could do interlaced 1024x768 with a > 28KHz signal, but it'd be hell on the eyes. Possibly that's the SGI's default > though if it can't detect what monitor you're plugging into it? (scratch that > idea if the outputs are BNC, but if the video's done over some form of > multi-pin connector, might it not need strapping in a certain way to indicate > display type?) > > cheers > > Jules > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 11 months

HP 2621B terminal available

by bobalan＠sbcglobal.net

I have an HP 2621B terminal WITHOUT the keyboard free to anyone who wants it. It does power on but displayed characters (it has a menu at the bottom of the screen) are dim and a little out of focus. Bob

19 years, 11 months

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