test-drb November 2004

test-drb@ccmp.vtda.org

207 participants
458 discussions

by pete＠dunnington.u-net.com

On Nov 28 2004, 7:50, Lyle Bickley wrote: > My Onyx is linked to a Sun NFS/DNS server which unfortunately has a SAS FDDI > device - so my FDDI setup does not make a proper ring either. Sigh... > > I'm on the lookout for a FDDI switch with both dual and single capability - > but so far haven't stumbled across one for a price I'm willing to pay... If I find anything, I'll let you know. I was disgusted to discover, a couple of years ago, that our Chemistry Department threw out several nice FDDI switches about a year or two previously, because they thought nobody would want FDDI any more :-( This statement came from the guy who gave me my first Indigo (and a few other machines, at other times)! -- Pete Peter Turnbull Network Manager University of York

19 years, 8 months

HP Paintjet stepper motor driver IC

by ard＠p850ug1.demon.co.uk

I've got an HP Paintjet printer on the bench (this is on-topic, it seems to have been made in 1986 or so). I've figured out most of it (even the PSU section with a complex custom DIL resistor pack), but I can't indentify the driver chip for the linefeed motor, which is a 4-input unipolar stepper motor. Anyway, the driver chip is marked 1820-4864 (too late for my equivalents list). It would seem to be a quad power driver chip rather than a stepprr motor controller, as it takes in 4 bits from one of the microocntroller ports. The pins, as I've traced them seem to be : 1 Input 2 +5V 3 Output 4 N/C 5 Input 6 +5V 7 Output 8 Ground 9 Clamp 10 Output 11 Input 12 +5V 13 Output 14 Input 15 +5V 16 +5V It's a normal 16 pin DIL package (no heatsink tabs or anything). I usspect, without prood, that it's actually 4 separate stages, AND or NAND functionality, : 1 & 2 -> 3, 5 * 6 -> 7, 12 & 11 -> 10, 15 & 14 -> 13 Does that pinout ring any bells with anyone? It's not any of the chips in my TI Interface Databook.. -tony

19 years, 8 months

Greenbar paper

by pete＠dunnington.u-net.com

On Nov 28 2004, 14:31, Gordon JC Pearce wrote: > Pete Turnbull wrote: > > Our library announced they had some to get rid of a few days ago. If > > it's not been claimed I could get you some, but the boxes are heavy so > > expect to pay quite a lot for shipping. > > > Can you get me the postcode? One of my mates runs up and down to > Birmingham every week and can probably be persuaded to make a detour. > Especially since I'm doing his wheelbearings for him next weekend... It would be a sizeable detour, from Brimingham to York. The postcode is YO10 5DD, and if he has satnav, he'd be looking for Grid Ref SE 622 506 or 53? 56.9' north (53.9477?), 1? 3.1' west (-1.0523?). -- Pete Peter Turnbull Network Manager University of York

19 years, 8 months

MOS 6545 Application Notes

by swtpc6800＠comcast.net

Rich, I have a Synertek SY6545 CRT Controller applications note (AN3 July 1980). It is about 24 pages, I can scan it tomorrow. Michael Holley www.swtpc.com/mholley > > Someone contacted me and asked if I had ever seen an "application > notes" document for the MOS 6545 CRT controller chip. I don't have it; all > that I have is the data sheet. > > If anyone has this, please let me know. Thanks. > > Rich >

19 years, 8 months

ZX81 denigrated! (was Re: Approaches to projects)

by pete＠dunnington.u-net.com

On Nov 27 2004, 18:54, Dave Dunfield wrote: > At 16:28 27/11/2004 -0500, you wrote: > >----- Original Message ----- > >From: Tony Duell <ard(a)p850ug1.demon.co.uk> > > > >> What's this love of the ZX81, which I regard as a postively horrible > >> machine. I'd not rip one apart, though, mainly because there's little of > >> use to raid from it... > > > >You regard it as horrible because . . . ? > > Aside from keyboard ;-) > > CPU intensive video design - lose video when program running (or SSLLOOWW > mode for ZX81). > > This also makes it highly dependant on the internal firmware, so that it's > tough to adapt other Z80 software systems to run on it. > > "RF only", and poorly shielded computer make it tough to get decent TV display. I wonder if that's becasue it's VHF? UHF ones I've seen here aren't *too* bad, and it's trivial to add a composite video lead. > Limited internal RAM - and expansion very prone to connector problems/flakiness > (practically useless without an external keyboard so that you didn't have to > touch the machine while it was running). Yu can replace the internal RAM. > Slightly odd dialect of BASIC. Slightly?!*! > But... I still consider the ZX80/81 a rather interesting and innovative design, > because it truly was designed to get "something from almost nothing". Most of > the items listed above are just the "nature of the beast" - given what it was > (the lowest price entry on the block) and to be *VERY* cheap to manufacture. Yes, I would agree. I still keep mine, though I've hardly ever used it. -- Pete Peter Turnbull Network Manager University of York

19 years, 8 months

Masscomp computers?

by rigdonj＠cfl.rr.com

Does anyone on this list play with the Masscomp computers? Joe

19 years, 8 months

MOS 6545 Application Notes

by rcini＠optonline.net

Hi: Someone contacted me and asked if I had ever seen an "application notes" document for the MOS 6545 CRT controller chip. I don't have it; all that I have is the data sheet. If anyone has this, please let me know. Thanks. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

19 years, 8 months

Wired running SGI Article

by pete＠dunnington.u-net.com

On Nov 27 2004, 13:01, Lyle Bickley wrote: > I always have tried to collect/restore those systems with the best graphics > and video options... > > In my SGI collection I have: > > Qty. Description That's a nice collection, especially the second Onyx. FDDI, too (I have FDDI on my Origin and two Indys and an FDDI-ATM bridge but unfortunately the Indys are SAS devices so it doesn't make a proper ring). -- Pete Peter Turnbull Network Manager University of York

19 years, 8 months

Free : Centronics ribbons

by birs23＠zeelandnet.nl

Free for postage a bunch of unused Centronics ribbons for the models 400, 455, 800, 855. Reorder number on the box is 44688116 Stefan. ------------------------------------------------------- http://www.oldcomputercollection.com

19 years, 8 months

Greenbar paper

by pete＠dunnington.u-net.com

On Nov 27 2004, 10:59, Gordon JC Pearce wrote: > I apologise if this question has been done to death, but is there > anywhere in the UK I can get 14 7/8" greenbar paper? Our library announced they had some to get rid of a few days ago. If it's not been claimed I could get you some, but the boxes are heavy so expect to pay quite a lot for shipping. -- Pete Peter Turnbull Network Manager University of York

19 years, 8 months

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test-drb November 2004