test-drb October 2002

test-drb@ccmp.vtda.org

261 participants
654 discussions

Swapping boards on ST225 drives / Philips P3800 help

by julesrichardsonuk＠yahoo.co.uk

Tony (and others), > I have the schematics of the ST225 somewhere. I misremembered about the drive - I've just had the case off the machine to get some pictures in response to Stefan's post about the P4500 (at www.moosenet.demon.co.uk/temp/p3800 for anyone who's interested) The drive's a Rodime 202E which going from memory is 50MB or so. I'm quite keen to see if I can get this thing running now as it's got me curious. The key at the front has 3 settings - off, on and 'pm' - I have no idea what the latter does but the abbreviation might mean something to someone?? Applying power I get LEDs on the back of all cards, plus one labelled as +5V on the power supply board. No fan activity though and no hard disk spindle motor; maybe a +12V rail is dead or the problem might be more tricky to diagnose. There's five LEDs on the front of the case - labelled 1,2,3 and 4 plus one with a power symbol - none of those light when power is applied. Might be something stupid like the system is waiting for a console command before starting the disk but that's probably a little too hopeful :-) There's 6 cables hanging out the back, all terminated with 25 pin connectors. One's black and unlabelled, another is grey and unlabelled, and all the rest are grey and labelled as: '8 bit 3100', '16 bit 3100' '8 st' and '8 st4'. Mean anything to anyone? Are those terminal types or something? I'll reseat all the cards tomorrow and measure a few voltages to see what's what - plus connect the hard drive to a known-good supply and just check it does spin up. IC dates are all in 1984 so it's more recent than I thought (I'd guessed '82 or so) but no idea when it last ran or what it was used for. Hopefully the disk wasn't wiped prior to it being submerged in a flood! :) cheers Jules __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page >from News and Sport to Email and Music Charts http://uk.my.yahoo.com

22 years, 5 months

IBM 5150 brings $910 on EBAY

by Innfogra＠aol.com

I would say that the three original manuals and the DOS SW contributes mightily to the value to collectors. When Items like this sell for such high values I notice they usually include the original Software and manuals. Often they have the original boxes. Also condition is very important to collectors. This one purports to be in near perfect condition which is somewhat rare in its own right. Paxton Astoria, OR

22 years, 5 months

Micropolis hdd

by woftbo＠cox.net

I have been searching for information regarding the assembly of a Micropolis 1991 hard drive. What is the best method to disassemble the case to access the latching area? Dave S

22 years, 5 months

Removing glued on heatsink (was: Anyone need 486 motherboards?)

by dwightk.elvey＠amd.com

>From: "Don Maslin" <donm(a)cts.com> > > >On Tue, 29 Oct 2002, chris wrote: > >> Ok, anyone know of a safe way of removing a glued on heatsink? I have a >> few of these 486 CPUs where the heatsink is glued down. I could just jam >> a screwdriver in and snap it off, but that just doesn't seem very good >> for the chip. > >Better a single edge razor blade or a putty knife than a screwdriver! >Too much local load with the screwdriver blade - probably crack the >chip. > - don > >> -chris >> <http://www.mythtech.net> >> Hi I've always removed glued things from chips by heating it first with a hot plate. We used to remove the epoxied covers >from EPROMs this way in the lab when someone would plug one in upside down. This way we could replace the blown bonding wire ( the most common failure for reversed power ). It was handy to have a wire bonder around ( Ah, the good old days ). Dwight

22 years, 5 months

Philips P4500

by julesrichardsonuk＠yahoo.co.uk

> Does anybody know anything about a Philips P4500 ?? > I just now the size which is well, a decent size.... :) > Maybe someone has a picture ? not as such, but maybe it's a bigger brother of my P3800. In which case I'll be amazed - I heard of one other Philips system a few years ago which was a similar but more basic version of mine (P---, can't remember the number now), but the owner had long since disposed of it when I made enquiries. Never come across anyone who has the same system as mine, or even heard of it, and not heard of a 4500 either. My unit's about 1 foot wide, 4ft deep and 3ft tall and is some kind of multi-user CP/M system, or so I was told. It certainly has a lot of Z80 CPUs on the cards in the cardcage! Not a particularly lightweight system either. I can email an image off-list if you want. cheers Jules __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page >from News and Sport to Email and Music Charts http://uk.my.yahoo.com

22 years, 5 months

Philips P4500

by stefan＠softhome.net

Hiya, Does anybody know anything about a Philips P4500 ?? I just now the size which is well, a decent size.... :) Maybe someone has a picture ? Stefan.

22 years, 5 months

Whats this nubus card?

by cb＠mythtech.net

>Whats this nubus card? > >Workstation Technologies card. No idea but I believe it was an early video >conferencing setup. Appears to have an ADB or S-video connector, mini-Din >serial, a three row DB-25. Has a 68030/33 processor on board so it must >have some amount of horsepower in its day. Awesome looking card anyway. Hey.. no fair... I was going to buy first, ask questions later! (does this mean you beat me to responding to the guy on this?) -chris <http://www.mythtech.net>

22 years, 5 months

[OT] Fun find...

by patrick＠evocative.com

I've had a "grab bag" of chips in a box for months that I haven't had time to sort. Last night I got the bug, and while straightening pins and sorting, I found an AY-3-8500-1, one of the original "Pong on a Chip" chips. I found some schematics online quite easily. Condition of the chip is unknown, and I guess I'm going to have to build to find out, unless one of you has a suggestion for a quick health check? Patrick

22 years, 5 months

Drives? (was: RE: Tales of VCF 5.0?)

by fmc＠reanimators.org

Tom Uban wrote: > At 04:28 AM 10/29/2002 -0600, [Tothwolf] wrote: > >http://www.vintage-computer.com/images/VCF5/Tony%20Cole%20Vendor.jpg > >http://www.vintage-computer.com/images/VCF5/MemoryBillia2.jpg > > > >Does anyone recognize the drive with the numeric pad and LCD on the far > >right of the above two photos? It looks nearly identical to the 4 drives > >in my SGI 210S, and I'm still not exactly sure what type they are. > > It was labeled with a Seagate brand, but I think that when I last used one > like it it was a CDC brand drive, perhaps a Sabre. Didn't Seagate buy that part of CDC's disk drive business? -Frank McConnell

22 years, 5 months

Apple II Programmer's Aid ROM

by RCini＠congressfinancial.com

I didn't realize that Integer BASIC also included the ROM image...in which case I don't need it. Was there a special manual for those commands or were they covered in the DOS 3.3 book? Thanks. -----Original Message----- From: Sellam Ismail [mailto:foo@siconic.com] Sent: Monday, October 28, 2002 8:08 PM To: cctalk(a)classiccmp.org Subject: Re: Apple II Programmer's Aid ROM On Mon, 28 Oct 2002, Eric Smith wrote: > Rich wrote: > > I just read about this in the A2FAQ. Does anyone have this Apple ][ ROM > > and manual? > > If you've got a DOS 3.3 Master diskette (or a "BASICS" diskette), you've > got the ROM image. It's in the INTBASIC file on the DOS 3.3 Master. > > I've got a manual, somewhere. And of course if you boot the DOS 3.3 System Master on a 64K Apple ][, it will load the Integer BASIC ROM image (containing the Programmer's Aid ROM) into the upper 16K of memory. Then you can switch into Integer BASIC from Applesoft BASIC by typing 'INT' (which is a DOS command). To get back to Applesoft type 'FP' (for Floating Point, as in floating point BASIC). INT basically bank-switches in the ROM image in RAM. You can also press RESET to get back to Applesoft. Switching using either command will init your environment from scratch (i.e. any BASIC program in memory, either Applesoft or Integer, is lost). Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

22 years, 5 months

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test-drb October 2002