test-drb December 1998

test-drb@ccmp.vtda.org

168 participants
844 discussions

FSOT: IBM 4869 external 5 1/4" floppy drive

by SUPRDAVE＠aol.com

if the drive bezel has a * on it, it's a 360k. if no * is on the faceplate it will be a 1.2 model. it's easy to change the drive anyway, i installed a 1.2 drive in the 4869 enclosure. In a message dated 98-12-01 18:40:40 EST, you write: << The title says it all. External floppy drive made by IBM. Excellent condition. It has the standard DB-37 connector. I think it's a 1.2Mb model but I'm not sure. Guaranteed against DOA. >>

25 years, 5 months

RSTS & the BRA81FH

by DSEAGRAV＠toad.xkl.com

Remember when I dropped my 11/44 off a cart? The RA81 dropped from about 2', and had crap (As in the other two BA-11) land on it. On later reassebling the system in another room, it no logger booted. I assumed I'd finally killed the RA81 (After also dropping it on Jeff's toes, and spinning it up with the brakes on!) and let it sit. Well, this morning, I got bored, and went back to playing with the 11. Thought maybe I could talk it into doing something from the console. Found out I'd had the SDI cable in the UDA50 backwards. Oops. Spin RA81 up, say B DU0... RSTS loads. THe drive is still alive. Throwing a few seek errors, but still readable. The Bastard RA81 From Hell Lives Again. I'm going to attempt backing it up to tape tomorrow. Think this would jinx it? -------

25 years, 5 months

PET Composite Video

by foxnhare＠goldrush.com

> From: Philip.Belben(a)pgen.com > Subject: Re: PET Video (was: Replacing 6550s) & 128 > > Foxnhare (who are you anyway? I've seen the address before. You're not > Larry Anderson by any chance are you? :-) ) wrote: Yep, the login was my wife's idea... Fox: an old definition for my middle name, Todd, and Hare: for her last name. > >> From: Doug Spence <ds_spenc(a)alcor.concordia.ca> > >> Subject: Re: Replacing 6550s > > > >> (I especially find it cool that they list various part numbers for the > >> connector. :) ) > > > > Digikey is the best source for inexpensive PET compatible connectors. > > (1-800-DIGI-KEY) along with a ton of other cool parts. > Many thanks for that. I know where to turn next time I'm looking... I think the last batch of 12/24 PCB connectors from them cost me about $18 (for 10). Very reasonable! [snip!] > I thought the video signals were there on later machines too, but I can > well believe it might not work on the 12 inch screen models. I would think you could get a multi-sync to do it, but the way the screen behaves I think the fat-forty and 80000 series were able to change sync rates. (Of course what do I know I'm just mainly a software guy). > My experience is that Nick Hampshire's circuit doesn't work at all. Using > the same two chips, 4011 and 4066, the correct procedure (sorry. The > procedure that worked when I tried it) is to combine the two syncs with the > 4011, invert (I think - not sure about this one) with another 4011 gate, > and use that to gate the video using the 4066. Works a treat. They tried > it at school, too (don't know what circuit tho'), and got a grey background > for the white text. I imagine a series capacitor might help, but I've not > tried it. Could ya like draw it out or something... I would really like to have a composite output on the PET (ohh could do WWW quick-time animated movies of such classics as Drameda! or Dance! - PET character animated shorts) 100k of video for a 5K program animation :) Actually would be better to screen capture it off of an emulator and then you can compress it way down to say 60 k or less.. > From: ard(a)p850ug1.demon.co.uk (Tony Duell) > Subject: Re: PET Video (was: Replacing 6550s) & 128 > > [Composite video adapter] > > > My experience is that Nick Hampshire's circuit doesn't work at all. Using > > the same two chips, 4011 and 4066, the correct procedure (sorry. The > > I've never tried that one. I've used modifications of the TRS-80 Model 1 > circuit and the BBC micro circuit with no problems at all. The latter is > simpler, so I'll describe that. But the output has a little DC offset > that some (a _very_ few) monitors object to. > > Start by Xoring HSync and VSync to get a CSync signal. I normally use a > 74LS86 for this. But the XOR-from-4-NANDs using a 74LS00 once got me out > of a hole when I couldn't find any '86s. Invert CSync to give Csync/ > using either another section of the '86 or a suitable TTL inverter. > Alternatively make an XNOR gate from 4 NORs. > > You now combine video and CSync/ using this circuit Or the complete circuit of this? I would really like to get a composite circuit for the PET FAQ on-line One could concevably make a portable PET (yeah, the PET is kinda portable, but not as much as an SX 64 or 128D) if such a circuit was available. ;>

25 years, 5 months

HP3000 help needed

by rigdonj＠intellistar.net

Aaron, At 07:05 PM 11/27/98 -0800, you wrote: > >9144 tape drive - I've already deduced that it's a low-density, 16-track >capable of 67/134 megs and the tapes have to be purchased pre-formatted. Not only pre formatted but preformatted by HP. ****NO*** others will work. > >2563A Printer - with a modular connector. > >9123 3 1/2" dual floppy - picked up after-the-fact at a yard sale. It's >HP-IB, but has a weird DIN power connector cord. No P/S. This drive is a double sided 3.5" HP-IB drive. It's exactly the same as the 9122 EXCEPT that it does no t have a power supply. It was sold only for the HP 150 Touch Screen II and the TS II supplies +5v and +12V power to it via the DIN plug. I have used old PC power supplies to operate them. I can dig up the pinout if you need it. Joe

25 years, 5 months

Any collectors in Minneapolis?

by ddameron＠earthlink.net

Hi Doug and all, At 03:10 AM 12/2/98 -0600, you wrote: >I constantly drool over stuff that's in the Charles Babbage Institute's >archives, but I don't get to Minneapolis very often (OK, I *never* get to >Minneapolis). > I found by willing to be helpful with them, they were willing to copy and send some material for me. I sent them some material they wanted, and they sent me some issues of "The Computer Hobbyist" in return. Of course this isn't the same thing as going there and discovering the material first hand! -Dave

25 years, 5 months

HP Laserjet Series II

by fmc＠reanimators.org

John Amirault <amirault(a)epix.net> wrote: > How old are the machines? When is the last time they were CLEANED? I am no > genius but the idea of CLEANING the rollers is, to me, a good one. Hope this > suggustion helps you. Cleaning helps -- if the rollers have picked up dirt it will make it harder for them to pick up paper. But the fundamental problem is that rubber ages and gets hard. Once upon a time (mid-1980s) some of the HP CEs used to carry an aromatic fluid they called "Fedron" which was good for restoring the gumminess of hard rubber rollers. I saw them use it on 2601 (Diablo 630) platen rollers and the little roller in the 2619 chain printer (a Dataproducts something) that drives one of the paper-jam detectors (roller not turning => paper not moving => paper jam, and when this one got hard enough that the paper just slid over it without turning it you got one frustrated computer operator). Is this stuff still available, or did it get banned because it's bad for the ozone layer? Not sure it would work for LJ II pickup rollers, they're a softer rubber. Nor am I sure what the fluid did, for all I know it stripped off a layer of the rubber. -Frank McConnell

25 years, 5 months

Now VERY *OT* (hit delete now): RE: networking newbie

by cswiger＠wilma.widomaker.com

>> The management is not married to DOS/WIN/NT as a >> "they are great" but rather it does the job for >> the scale of business they are and within >My friend is running Linux on his home PC, but if >you didn't know any better (and if you didn't look >close enough) you'd swear he was running Windows 95. >The fact is that his desktop might as well BE Win95, What's nice is being paid to support a win shop but the mgmt lets you use a pc *nix for sysadmin, use samba, put a telnetd on NT, etc. Your friend must be using fvwm95 - I just got StarOffice last night, all 70Mb of it. For topical material - I'd love to find a Xenix or SCO unix box o' 5 1/4" disks and manuals to run on a 386 - used to see 'em for sale cheap at hamfests. Chuck cswiger(a)widomaker.com

25 years, 5 months

Any collectors in Minneapolis?

by fauradon＠pclink.com

Yes there are collectors in Minniapple. You know, I've never had the chance to go to the Chuck Babe institute. But I can tell you one thing when it Snows here We stay home. (besides we're having temperature in the mid 50's these days) I have a pretty busy schedule but I could arrange a trip. Francois ------------------------------------------------------------- Visit the desperately in need of update Sanctuary at: http://www.pclink.com/fauradon/ >I constantly drool over stuff that's in the Charles Babbage Institute's >archives, but I don't get to Minneapolis very often (OK, I *never* get to >Minneapolis). > >Are there any Minneapolitans (?) out there willing to copy a few goodies >from their archives? I'd pay for copying, shipping, gas, and probably a >coupla bucks more. There's enough interesting stuff there that I'm sure a >small business could be established by selling reprints to collectors and >historians (besides, what else are you going to do when it's snowing >out?). > >-- Doug >

25 years, 5 months

Now VERY *OT* (hit delete now): RE: networking newbie

by JRichardson＠softwright.co.uk

>> NT - about a day to get set up and working (or not at all in this >> case!). Needs lots of hardware. Costs lots. > >And I'm not paying for any of it, so who gives a rat's ass if some >corporate blow-hard has his head so far in his rectum that he >wants to run NT. That's the whole problem though. It's not a personal dislike of NT that annoys me, it's the fact that all this comes down on the end user - the users of the systems/software that we produce, not necessarily our direct customers - and forces them to use a shoddy system that's not up to spec and costs a lot more that it has to. NT's good for some things, especially on the client, (although even then I'm from the camp that says that if a client-side app can't be done in Java running within a browser then it isn't worth doing, so 200MB of NT overhead kinda kills my argument!) but it's the fact that *most* people have a "stick with what you know" policy (which is usually Win95 or NT, but could be a UNIX system) that really gets to me, especially when presented with hard figures to prove them wrong. I get frustrated delivering solutions to end users when I know that there is a better, cheaper and faster way (and yes, that is taking into account things like support/maintenance costs), but don't have enough clout within a company to say what systems to use and can only make recommendations which I know will be ignored. (phew.... deep breath! :*) it can be a very, very crazy world... cheers Jules >

25 years, 5 months

FSOT: IBM 4869 external 5 1/4" floppy drive

by roblwill＠usaor.net

But, if you put a 1.2MB drive in it the case, it won't work with a PC or XT. I tried it, and it just gives the same old "general failure" errors. -- -Jason Willgruber (roblwill(a)usaor.net) ICQ#: 1730318 <http://members.tripod.com/general_1> -----Original Message----- From: SUPRDAVE(a)aol.com <SUPRDAVE(a)aol.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Tuesday, December 01, 1998 7:57 PM Subject: Re: FSOT: IBM 4869 external 5 1/4" floppy drive >if the drive bezel has a * on it, it's a 360k. if no * is on the >faceplate it will be a 1.2 model. it's easy to change the drive anyway, i >installed a 1.2 drive in the 4869 enclosure. > > >In a message dated 98-12-01 18:40:40 EST, you write: > ><< The title says it all. External floppy drive made by IBM. Excellent > condition. It has the standard DB-37 connector. I think it's a 1.2Mb model > but I'm not sure. Guaranteed against DOA. > >> >

25 years, 5 months

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test-drb December 1998