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Continental 50 Pin connector vs. AMP 200276 50 pin connector - same?

by Jay Jaeger

I have an HP 2875B paper tape drive that I want to interface to. It has a 50 pin block connector (using well under 1/2 the pins). The connector manufacturer was Continental. I have already discovered, the hard way, that it is not a winchester connector - the pins on the 50 pin Winchester connector I just obtained via ePay that otherwise fits are too small in diameter and won't make contact. I *could* increase their diameter using solder - but -- yuck. The other connectors of this sort I am familiar with that have the same general overall size and pinout were made by AMP. Does any one know if the AMP connectors and the Continental connectors would be compatible? Thanks. JRJ

2 years, 10 months

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Gb Ethernet and 10Mb links

by Craig Ruff

FYI: The Ethernet standards dropped support for half duplex connections a few years back, so that if you have something that depends on half duplex links a recent Ethernet switch might not support it.

2 years, 10 months

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Re: Getting floppy images to/from real floppy disks.

by Chuck Guzis

On 5/28/23 09:17, Tony Duell wrote: > I've come across the former and have the datasheets. From what I > recall it was common to use it a control store sequencer and have > microcode ROMs wider than the 8X300 needed, the extra bits were used > to directly control hardware. Power hog (well, it was bipolar) with a 3-bit opcode and a somewhat strange programming model. You could usually spot one by the 50 pin cerDIP and the external pass transistor. I think I still have a loose one in my hellbox--and at least two in old systems. --Chuck

2 years, 10 months

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Recovering floppies attacked by mould

by Tom Stepleton

Greetings, Amidst all the floppy archiving discussion, here's a slightly different question: The weather is warmer now where I live, so it's starting to be a good time to do messy work outdoors. I have some mouldy floppy diskettes that I'd like to try to read (mostly 5.25"), plus a good flux reader. What is the best way to attempt to image these floppies? My thinking right now is that for each floppy I can attempt this procedure: - remove the mouldy cookie from the infected disk jacket; discard the latter - give the cookie the best clean I can (how?) and allow to dry - place the cookie in a clean disk jacket - attempt to image - clean floppy drive heads Does this seem like a sensible plan? If so, what would be the best way to clean as much mould off the cookie as I can? Tools that come to mind are distilled water (tap water here is full of chalk), dish soap, cyclomethicone, and of course more fearsome solvents. I have kimwipes, microfibre cloths, and... 200-grit sandpaper, I guess :-) Thanks for any advice, --Tom

2 years, 10 months

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Rexon 30 aka CMC 7030 information needed

by Harten

Recently i digged out a system called Rexon 30, which was sold in germany/europe as a CMC 7030. The OS called RECAP BB was stored on a combined hard/removeable disk drive. There is no floppy or tapedrive at all. BB stands for a version of Business-Basic. The removeable pack got lost but there is a little hope that the OS is still on the fixed disc. There will be a lot of work for me before i can try to power up this system again. Maybe it never will. If anyone has information and/or software stored for this system, i would be glad if he/she can part it with me. Rolf --

2 years, 10 months

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Super I/O chips and Getting floppy images to/from real disks

by Joshua Rice

Interestingly, i'm looking at procuring a reasonably vintage laptop for a computer festival i'm planning to attend soon. It seems that many laptops of the PIII era use SuperIO chips, but i'm rather confused as to how "low level" they get. Some of you may remember my RCA MS2000. I've had great luck writing bootable images from a PIII machine with a "standard" 1.44mb floppy drive, despite the format being 70-track, SSDD. The machine's floppy controller uses a bona-fide NEC uPD765 though, so no surprises it worked fine... ( Here's a video of me playing around with it for the curious... https://www.youtube.com/watch?v=qdKkaf-77dE ) I'm really asking if anyone has any recommendations for a laptop that is reasonably powerful, fairly modern (has USB), but also has a direct-connection floppy drive that can do device level shenanigans (via Omniflop) to allow me to write floppies in obscure formats. Bonus points if it can use it with a serial terminal emulator, and run the Emma02 RCA 1802 emulator on it as well. I, like Tony, don't drive, so i need something compact and portable for public transport travel. I've been eyeing up a Dell Latitude C series (C600?) But the whole SuperIO-over-parallel thing makes me think there might be proprietary drivers involved, preventing device level access of the floppy drives... Hopefully some of you might be a bit more wise. Cheers, Josh

2 years, 10 months

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HP 1000 A400, A600, A700, A900, A990 Servers, parts, & accessories

by Jesse Dougherty

Hi all, we are getting overstocked on the 1000 series stuff and wanted to see if anyone needed anything. We have most everything you could have in the 1000 A-series hardware. If anyone needs any loaded up A990 boxes we have a bunch of them configured below for $1,400.00 A990 Server 14-slot Micro 1000 Server 1 x 12990x A990 CPU 1 x 12221B 8MB Memory 1 x C2247A 1GB SE SCSI Internal disk drive 1 x C150xx DDS DAT Internal Tape Drive 1 x 12016A SCSI Controller board 1 x 12009A HP-IB Interface board 1 x 12005A Serial Interface board 1 x 12006A Parallel interface board 1 x 12040A Asynchronous Multiplexer Interface (MUX) board 1 x 02430x Voltage Jumper Board 1 x 12230A Front-plane memory connector (CPU to memory connector) Feel free to email if you need any HP 1000 hardware. Thanks Jesse Dougherty Cypress Technology Inc jesse(a)cypress-tech.com

2 years, 10 months

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Super I/O chips

by emanuel stiebler

Anybody out here, still in business using them? Which ones are still easily available? (I look for something which has 2 UARTs, FDC and IDE?) Thanks

2 years, 10 months

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ST-251 Data Recovery for Glenside Color Computer Club (GCCC)

by Jim Brain

At the most recent CoCoFEST!, I brought home the old Glenside Club Computer Hard Drive. The mechanism is an ST-251, and I was wondering if someone on-list would be willing to attempt to pull data off the drive. I have no ability to configure to read this drive type, and the data is not precious or anything, I just though we should try to pull it off for historical sake. I was not in the club when teh drive was in use, so I do not know what could be on it. I assume BBS data, but it could be anything. Happy to post to someone who wants to give it a go. If the drive needs to be destroyed to get the data, or if attempting to read the data destroys the drive, I will not hold anyone responsible. I don't even need the drive back, just data if it is recoverable. Jim -- Jim Brain brain(a)jbrain.com www.jbrain.com

2 years, 10 months

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Re: Getting floppy images to/from real floppy disks

by Robert Feldman

>Message: 6 >Date: Sat, 20 May 2023 07:25:39 -0700 >From: Chuck Guzis <cclist(a)sydex.com> >Subject: [cctalk] Re: Getting floppy images to/from real floppy disks. > >On 5/20/23 04:21, Liam Proven via cctalk wrote: > >> I was startled to discover my (long gone) Athlon XP box could only >> handle a single floppy drive. The BIOS has no option for a 2nd. >> >> I can't imagine that was a significant cost saving. > >It's a matter of pins. I believe that it started when the "SuperIO" >chip started packing in more support for various peripheral functions >and the 2 pins for drive select and motor control of an extra drive were >viewed as least important. Earlier versions of the chip often allowed >re-purposing the pins used for the parallel port as an interface for an >extra floppy--you saw this on laptop systems, which often had only one >floppy drive in any case. cf. Intel's PCISet chip sets. > >--Chuck My main computer is a 15-year old Dell Precision T3400 (Core 2 Duo). It can handle multiple floppy drives, but the BIOS does not allow 360KB 5.25" disks, only 1.2MB in that size. Bob

2 years, 10 months

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