Search found 3347 matches

by BigEd
Tue Sep 22, 2020 12:20 pm
Forum: archive requests
Topic: swtpc.com is offline
Replies: 4
Views: 72

Re: swtpc.com is offline

Thanks Dave! Tragically, the mirror doesn't have the deep-linked PDF I wanted... http://www.swtpc.com/mholley/Microprocessors/Electronics_Jul_24_1975.pdf (Laurence Altman "Microprocessor line offers 4, 8, 16 bits" in Electronics, issue July 24 , 1975) Edit: or this history, although the Internet Arc...
by BigEd
Tue Sep 22, 2020 11:27 am
Forum: archive requests
Topic: swtpc.com is offline
Replies: 4
Views: 72

swtpc.com is offline

Oh no - swtpc.com appears to have gone offline, together with lots of scanned PDFs.

Anyone got an archive?
by BigEd
Tue Sep 22, 2020 8:59 am
Forum: software & utilities for the pc, mac or unix
Topic: Disk Preservation and Writing Tools
Replies: 6
Views: 177

Re: Disk Preservation and Writing Tools

Yes, perhaps just a "take care - dirty disks damage themselves - see here". Where we link to the best summary or thread we can find.
by BigEd
Tue Sep 22, 2020 8:03 am
Forum: software & utilities for the pc, mac or unix
Topic: Disk Preservation and Writing Tools
Replies: 6
Views: 177

Re: Disk Preservation and Writing Tools

Is it worth a note in the head post about cleaning disks, or the risk of trying to read a mouldy disc, or anything like that? It would be a shame to ruin the very disk you plan to preserve, just because you didn't realise the risk. I suppose dirty heads would be bad too. Is there such a thing as sti...
by BigEd
Mon Sep 21, 2020 1:29 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 348
Views: 51263

Re: Remarkable videos recently posted on Youtube

That's good, but not it! It was short, it involved some sort of transparent acrylic sandwich, and it lit up according the return current path, either because of tremendous voltage or because of embedded LEDs. I might be confusing two demos...
by BigEd
Mon Sep 21, 2020 10:45 am
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 348
Views: 51263

Re: Remarkable videos recently posted on Youtube

There's a great demo I once saw showing how return currents in a ground plane follow - or try to follow - the forward path in the signal layer. I've tried and failed to find it. But I did find this demonstration, probing a deliberately defective ground plane with an inductive probe: Gaps in Return P...
by BigEd
Sun Sep 20, 2020 5:52 pm
Forum: 8-bit acorn software: other
Topic: BBC Basic Bot (on twitter)
Replies: 25
Views: 1992

Re: BBC Basic Bot (on twitter)

Ha ha - I just saw those, as retweeted by The Teletext Archaelogist

Good stuff!
by BigEd
Sun Sep 20, 2020 5:34 pm
Forum: 8-bit acorn software: other
Topic: BBC Basic Bot (on twitter)
Replies: 25
Views: 1992

Re: BBC Basic Bot (on twitter)

A bit of a collection of good ones (and a bit of background)
https://www.dompajak.com/bbcmicrobot.html
by BigEd
Sun Sep 20, 2020 3:05 pm
Forum: 8-bit acorn software: other
Topic: PunyInform and Ozmoo
Replies: 277
Views: 9319

Re: PunyInform and Ozmoo

I like this - thanks for writing up the details. It's an oddity that the Master 128 host has more RAM than the second processor - this seems like a neat way to make use of it.
by BigEd
Sun Sep 20, 2020 2:02 pm
Forum: acorn & bbc micro user group (abug) events
Topic: Acorn Preservation Team meeting #1, Sunday 20th September 2020, 6:30pm - 9:30pm
Replies: 17
Views: 671

Re: Acorn Preservation Team meeting #1, Sunday 20th September 2020, 6:30pm - 9:30pm

It struck me that some of what this group is tackling is rather like what museums have to do. Here's some advice from The National Archives including a spreadsheet listing available software. I note they mention Collections Management Systems which is another meaning of CMS. They also mention Digita...
by BigEd
Sat Sep 19, 2020 5:52 pm
Forum: programming
Topic: Help with writing a 64-bit ARM assembler
Replies: 6
Views: 298

Re: Help with writing a 64-bit ARM assembler

If I were asking, I think I'd just bump the thread after a few months, see if someone becomes interested, or someone might have improved their skills, or missed it previously. It might be worth offering a bounty, but I wouldn't expect that to be decisive. Perhaps if you have something unique like a ...
by BigEd
Sat Sep 19, 2020 1:27 pm
Forum: 8-bit acorn hardware
Topic: I need to learn
Replies: 7
Views: 327

Re: I need to learn

The manual for the program "The Visible Computer: 6502" is a pretty good introduction: https://archive.org/details/The_Visible_Computer-6502_Manual/page/n3/mode/1up [also available as PDF ] You can run the program itself in-browser here (with some unfortunate colour fringing.) Some tips for running ...
by BigEd
Sat Sep 19, 2020 11:32 am
Forum: programming
Topic: Tube coding 101! Help wanted please.
Replies: 36
Views: 1364

Re: Tube coding 101! Help wanted please.

Just for the record, Dave pointed me at the thread with the resolution to the X command mystery.
hoglet wrote:
Thu Sep 17, 2020 9:11 pm
jgharston wrote:
Thu Sep 17, 2020 8:07 pm
...and checking the MOS 1.23 code reminded me, the *X command writes a zero to TUBE+8 (ie &FEE8) and then loops forever.
What's this actually trying to do then?
by BigEd
Wed Sep 16, 2020 5:01 pm
Forum: new projects and releases: demoscene
Topic: Ray tracing in a tweet
Replies: 4
Views: 164

Re: Ray tracing in a tweet

Splendid!
by BigEd
Tue Sep 15, 2020 7:41 pm
Forum: stardot FORUM
Topic: Unicode déjà vu (not important)
Replies: 6
Views: 247

Re: Unicode déjà vu (not important)

There was a big forum migration (maybe this one?) which left a bit of Unicode wreckage, which was then, I think, found and cleaned up. But just possibly only post texts were fixed, not title texts.
by BigEd
Tue Sep 15, 2020 7:27 pm
Forum: 8-bit acorn emulators
Topic: PDP-11 tube emulator in C?
Replies: 7
Views: 221

Re: PDP-11 tube emulator in C?

I'm sort of reminded of run6502 and run65816 which both have some minimal Acorn MOS gadgetry. Sounds like you want a runpdp11, which is a fine thing to want.
by BigEd
Tue Sep 15, 2020 6:13 pm
Forum: stardot FORUM
Topic: Unicode déjà vu (not important)
Replies: 6
Views: 247

Unicode déjà vu (not important)

This thread below has an e-acute in the post titles, which is mis-rendered in three places (title, headline, search result title) and looks very like a Unicode kind of thing:
(I hesitated about posting such a small observation, but Dave Arcadian put me up to it...)
by BigEd
Tue Sep 15, 2020 2:35 pm
Forum: programming
Topic: Using a Mac or PC for BBC games authoring
Replies: 44
Views: 1075

Re: Using a Mac or PC for BBC games authoring

Well, here are some possibilities for a new filename extension for tokenised Acorn-format BBC BASIC files that I just dreamt up. Everyone, please feel free to comment on them: .chn (short for CHAIN) .chain .bbc8 (BBC 8-bit) .bb8 (droid appeal) .bbcacorn .acornbasic .E00 (old school) :?: How about ....
by BigEd
Sun Sep 13, 2020 8:30 am
Forum: archive submissions
Topic: Jolly Jack Tar by Sherston Software, original protected disc
Replies: 3
Views: 217

Re: Jolly Jack Tar by Sherston Software, original protected disc

Excellent! I'm happy to wait for a couple of weeks - easiest job in the world!
by BigEd
Sun Sep 13, 2020 8:13 am
Forum: archive submissions
Topic: Jolly Jack Tar by Sherston Software, original protected disc
Replies: 3
Views: 217

Re: Jolly Jack Tar by Sherston Software, original protected disc

Oh, please do write up the protection method! (And, I think you said you'd write up how you managed to do arbitrary and sufficient reads and writes with the 1770? Or maybe you have, but I've missed it?)
by BigEd
Sat Sep 12, 2020 3:18 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1267
Views: 159690

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

I think the trouble with putting a ribbon cable between the Pi and the Retroclinic internal Tube adapter is that the Pi is going to be flopping about and could come into contact with the adapter or other internal parts of the Master. I put a sheet of paper down, or put a paper envelope over the thi...
by BigEd
Sat Sep 12, 2020 3:17 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1267
Views: 159690

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

In my Master, the PiZero goes right on to the leveller (retro clinic) no issues. But the Pi3, the USB sockets get in the way, plus a cable means I wouldn't need to keep de-casing it every time. Ah, I see. I've got a sundby.com adapter board which must be just a couple of millimeters different, and ...
by BigEd
Sat Sep 12, 2020 9:27 am
Forum: stardot FORUM
Topic: Increasing code length in posts
Replies: 15
Views: 394

Re: Increasing code length in posts

....on GitHub I can't copy and paste using their raw..there is no way to select all from a raw file easily and copy n Paste. Oh, dear, sorry, I see the same. Didn't realise that would happen. I see that if you start an Edit on a file in github, you get a text cursor, and you can then Select All aft...
by BigEd
Sat Sep 12, 2020 8:10 am
Forum: stardot FORUM
Topic: Increasing code length in posts
Replies: 15
Views: 394

Re: Increasing code length in posts

When you're looking at a file in github, there's a Raw button at top left, which gives you a plain text view. Is that better for copy and paste?
by BigEd
Sat Sep 12, 2020 8:06 am
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1267
Views: 159690

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Not answering your question exactly, but I have a pi4 inside my master and it fits fine on the same adapter board. Is there an obstacle to doing the same with a pi3b? (You're right to ask about a cable, I think, in the sense that you do need to be very careful that it connects the right way around a...
by BigEd
Thu Sep 10, 2020 12:06 pm
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 434
Views: 12226

Re: 8271 disc controller de-cap and craziness -- do not try this at home!

Brilliant progress, an excellent journey, and thanks for building some kind of narrative for it!
by BigEd
Thu Sep 10, 2020 8:15 am
Forum: 8-bit acorn hardware
Topic: Recommended BBC Model B upgrades
Replies: 50
Views: 1108

Re: Recommended BBC Model B upgrades

You don't need Windows if you're using and MMB file and MMFS - there's a nice set of command line tools and now there's a GUI tool too.
MMBExplorer released!
MMB/SSD Utils in perl

And about sideways RAM, from upthread:
flaxcottage wrote:
Tue Sep 08, 2020 9:19 am
The BooBip SWR and EEPROM boards are a 'must' for a Beeb.
by BigEd
Wed Sep 09, 2020 9:05 pm
Forum: 8-bit acorn hardware
Topic: Info please! Acorn's in-house large-memory 6502 co-pro
Replies: 120
Views: 8870

Re: Info please! Acorn's in-house large-memory 6502 co-pro

We need a test which would fail on HiBasic, I think, and pass on TurboBasic. Is this such a test?

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