[cctalk] Re: NeXT computer system...

On Tue, Jul 16, 2024 at 18:13 PM Joshua Rice wrote: > I imagine it's quite difficult. Maybe not "functional Twiggy drive" > difficult, but probably "unmolested 128k Macintosh" difficult. > > It of course depends on who you know, and who you ask. Undoubtedly > there's a guy out there with a stack

[cctalk] Re: SCAMP at 61 (IBM Scientific Computer And Modular Processor) was Re: SCAMP at 50 (IBM 5100)

I have to assume that the SCAMP used in the IBM 5100 Portable Computer and relatives must have been a great deal smaller than the earlier machine. As such, a logical and unambiguous way to refer to it is "SCAMP Shrimpy." I hope this is helpful, --Tom

[cctalk] Recovering floppies attacked by mould

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

[cctalk] Re: Whitechapel Computer Works

I forgot to add that some gradual but real progress on adding the MG-1 to MAME is taking place as well. --Tom On Sat, Nov 5, 2022 at 7:01 PM Tom Stepleton wrote: > On Fri, 4 Nov 2022 17:53:10 PM Tony Duell wrote: > >> More seriously I have a working (last time I turned it on) MG1 with >>

[cctalk] Re: Whitechapel Computer Works

On Fri, 4 Nov 2022 17:53:10 PM Tony Duell wrote: > More seriously I have a working (last time I turned it on) MG1 with > monitor, keyboard, and mouse. Also have the technical notes manual and > an installation disk kit. Another chap I know (I think he's here but > I'll let him speak up) scanned

[cctalk] Re: You have Apple Lisa 1 "twiggy" system to trade for my IBM 5100 Portable PC?

> >> Are you sure about that? The 5100 doesn't support floppy drives. And > I've > >> never heard of third-party drives (that would need IMFs, too) for the > 5100. > > > > $3100 is about what IBM charged for a fully loaded 5150. (PC) > > THAT is not a 5100! $3100 for a 5100 would have been a

"Voltmitten": an amateur overdesigns a DC voltage monitor

Hi cctalk, Ever since CuriousMarc put out his YouTube horror film last April about a killer HP 9825T power supply , I've been worrying about how my own comparably-aged systems might avoid a similar fate, at least

Power supply power-up and power-down sequencing: how did it work?

Hi cctalk, I asked this question over on vcfed, but in the spirit of knowing more (and avoiding silly, costly mistakes) I thought I'd ask again here. I hope this is okay --- I think there must be a lot of community expertise to draw from, and not everyone is in the same forums. After seeing

Re: Extremely CISC instructions

Thanks for the suggestions, all --- more than I was expecting! I have plenty of reading waiting for me now, but I hope people won't let that stop them from sharing other examples. Cheers, --Tom On Wed, Aug 25, 2021 at 6:08 PM Josh Dersch wrote: > On Mon, Aug 23, 2021 at 5:38 PM Tom Steple

Extremely CISC instructions

Hello, For the sake of illustration to folks who are not necessarily used to thinking about what computers do at the machine code level, I'm interested in collecting examples of single instructions for any CPU architecture that are unusually prolific in one way or another. This request is highly

Re: Replicating IBM SLT/MST card interconnect

There wasn't much advice to be had on making modern connectors that interoperate with the header-like connectors used by IBM SLT cards, so I did my best to come up with some on my own. This design appears to be functional, but I've only ohmed it out so far, not put it to any kind of extended use:

Replicating IBM SLT/MST card interconnect

Hi cctalk, I'm looking to replicate the 24-contact connector system that IBM used on SLT and MST cards for many years. Has anyone done this before? The best photos of this connector that I can find online are on this page: