Search found 1440 matches

by BigEd
Tue Nov 21, 2017 9:57 am
Forum: hardware
Topic: ZX81 emulator
Replies: 11
Views: 138

Re: ZX81 emulator

It's a great idea, Rob, to do this by writing a C application for the Native ARM - I think the page we need is one about doing that. I'd've thought it's not quite a bare-metal ARM, in that you're writing to the SWIs provided in PiTubeDirect, which is then doing the work of talking to the host over t...
by BigEd
Mon Nov 20, 2017 4:10 pm
Forum: off-topic
Topic: Work experience BITD - claims to fame, and infamy
Replies: 10
Views: 272

Re: Work experience BITD - claims to fame, and infamy

I only did some summer work for Logotron ... Good to read about that - glad you wrote it up. These stories need to be told, the good and the bad. ...until 1998 ARM hadn't succeeded in designing a CPU... Remarkable! ... During the late 1980s a group of us pupils who were enthusiastic about computers...
by BigEd
Mon Nov 20, 2017 8:34 am
Forum: off-topic
Topic: Work experience BITD - claims to fame, and infamy
Replies: 10
Views: 272

Re: Work experience BITD - claims to fame, and infamy

Thanks - that site is new to me, although I've certainly seen some of the sites it links to. I did write a bit of a rant about Inmos, specifically about the T9000. See here and for a followup see here - links there to Iann Barron's interesting retrospective, from the time before my time. Some more s...
by BigEd
Sun Nov 19, 2017 10:31 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4061

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Just got back(*) - great meetup! I even wrote some code, and generally got more done in two days than the previous two months. At least. And some good chats too. I'm still terrible with names, but I do get there eventually. (*) OK, as it turns out I've been back for a few hours now, even unpacked an...
by BigEd
Fri Nov 17, 2017 9:39 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 133
Views: 4061

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

I hope I manage to walk around a bit more this time and see what everyone is up to. For my own part, I'll be assisting revaldinho in bringing up and hopefully demonstrating a couple of new CPUs as second processors. These are mostly the work of revaldinho and hoglet with some assists from me, and ar...
by BigEd
Thu Nov 16, 2017 6:27 pm
Forum: hardware
Topic: read / write to JIM
Replies: 28
Views: 579

Re: read / write to JIM

Not so much terrifying as ingenious - the Torch Graduate does it, so it can operate solely from the 1MHz bus without needing a ROM on the host:
viewtopic.php?p=177386#p177386
by BigEd
Tue Nov 14, 2017 5:23 am
Forum: programming
Topic: 6502 Stack
Replies: 8
Views: 315

Re: 6502 Stack

The data will remain, but possibly only for a short time, because if an interrupt happens it will push three values onto the stack. If you need to pick a value from the stack without pulling it, you generally use the stack pointer value to index into page one: TSX LDA &0101,X Hope this helps! Ad...
by BigEd
Fri Nov 10, 2017 7:48 pm
Forum: other vintage computer hardware, software and games
Topic: Early 70s Calculators
Replies: 38
Views: 1946

Re: Early 70s Calculators

Very nice!
"The 24 logic boards have a total of 424 Germanium transistors and 1074 Germanium diodes. It has a magnetic core memory."
- http://www.vintagecalculators.com/html/ime_26.html
by BigEd
Fri Nov 10, 2017 1:29 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 378
Views: 22352

Re: Beeb FPGA

(and for those of you using RSS readers:
https://github.com/hoglet67/BeebFpga/co ... aster.atom
)
by BigEd
Fri Nov 10, 2017 12:13 pm
Forum: off-topic
Topic: Work experience BITD - claims to fame, and infamy
Replies: 10
Views: 272

Work experience BITD - claims to fame, and infamy

I just came across a thread where people said they'd worked in the past for Watford, or Technomatic, and I'm sure I've seen people here say they worked for Acorn or the BBC... so, let's hear your stories, or at least your hints at stories! (Anyone ex-Solidisk?) (For myself, I didn't work for any 8-b...
by BigEd
Thu Nov 09, 2017 5:35 am
Forum: off-topic
Topic: retro-kit.co.uk has gone SSL
Replies: 8
Views: 269

Re: retro-kit.co.uk has gone SSL

There's some advice here about how to go secure - the very easiest way AIUI is to use Cloudflare's free proxy service: https://www.troyhunt.com/the-6-step-happy-path-to-https/ (Yes, you end up trusting Cloudflare if you do this. It's still an improvement. And there are many other ways, depending on ...
by BigEd
Wed Nov 08, 2017 11:07 pm
Forum: off-topic
Topic: retro-kit.co.uk has gone SSL
Replies: 8
Views: 269

Re: retro-kit.co.uk has gone SSL

...and all the other browsers... It's not just Chrome! It's a bit of extra work for people who run forums and websites, but I think it's a good idea. We, the people, want to be able to trust that our device is reaching the website we intend to reach, always, and that the data we exchange arrives in...
by BigEd
Mon Nov 06, 2017 9:23 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1016

Re: Unix on the Beeb

That's great!
by BigEd
Mon Nov 06, 2017 6:46 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 36
Views: 1016

Re: Unix on the Beeb

JGH's PDP-11 Basic runs in Unix? I am surprised! Or did you have to do some kind of port? Or am I confused?
by BigEd
Sun Nov 05, 2017 12:23 pm
Forum: software: other
Topic: Any scan of the Torch Software Catalogue?
Replies: 2
Views: 80

Re: Any scan of the Torch Software Catalogue?

Oh, thanks - it was right next to the others!
by BigEd
Sun Nov 05, 2017 11:38 am
Forum: software: other
Topic: Any scan of the Torch Software Catalogue?
Replies: 2
Views: 80

Any scan of the Torch Software Catalogue?

I see Torch offered a Unix-capable 68000 (and Z80) machine ( Torch Unicorn Technical Overview ), and recommended Unix users should program in C, although it seems they offered a wide range of languages: TORCH would recommend ProPascal, Aztec C or BBCBASIC (Z80) for software development on Z80 system...
by BigEd
Sat Nov 04, 2017 12:31 pm
Forum: off-topic
Topic: Alternate Universe Micros...
Replies: 17
Views: 535

Re: Alternate Universe Micros...

The stories of how things actually happened can be quite interesting too: JImmy Maher's excellent series recently covered the genesis of Compuserve, on the one hand, and The Source, on the other.
http://www.filfre.net/2017/10/a-net-bef ... ent-rogue/
by BigEd
Fri Nov 03, 2017 11:53 am
Forum: general
Topic: Computer Shops From Back In The Day
Replies: 59
Views: 5218

Re: Computer Shops From Back In The Day

I thought it was called Merry Hell...
by BigEd
Fri Nov 03, 2017 7:10 am
Forum: acorn atom
Topic: Atom Magazine Reviews
Replies: 52
Views: 2859

Re: Atom Magazine Reviews

(Here's the Nosher article for that image)
by BigEd
Thu Nov 02, 2017 10:56 pm
Forum: software & utilities for the pc, mac or unix
Topic: BBC BASIC for SDL 2.0 v0.19a released
Replies: 4
Views: 140

Re: BBC BASIC for SDL 2.0 v0.19a released

ouch! That's a serious performance regression, on the face of it.
by BigEd
Wed Nov 01, 2017 7:42 pm
Forum: software & utilities for the pc, mac or unix
Topic: BBC BASIC for SDL 2.0 v0.19a released
Replies: 4
Views: 140

Re: BBC BASIC for SDL 2.0 v0.19a released

Sounds good! BBC Basic is a good fit for the Pi, I think.
by BigEd
Tue Oct 31, 2017 8:52 pm
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

Thanks!
by BigEd
Tue Oct 31, 2017 8:44 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 130
Views: 10126

Re: Remarkable videos recently posted on Youtube

From 1985, Thames TV's Database program, showing off a Beeb running some extreme accessibility software (eye movement input device, £300), here https://youtu.be/16NwJwAmbcs?t=1m41s and another Beeb hooked up to a £300 RH Electronics Image Processing System https://youtu.be/16NwJwAmbcs?t=15m50s which...
by BigEd
Tue Oct 31, 2017 4:07 pm
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

Sounds good.

Fair point about the version - I just checked, and the official version of jsbeeb does the same thing, as does the latest source on the master branch.
by BigEd
Tue Oct 31, 2017 1:48 pm
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

Is there a way to annotate the link rather than disable it? Could be useful for someone aiming to debug the problem.
by BigEd
Tue Oct 31, 2017 8:57 am
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

ah, good - well, kind of good - thanks - I've opened an issue
https://github.com/mattgodbolt/jsbeeb/issues/152
by BigEd
Tue Oct 31, 2017 6:44 am
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

This might be user error, but I fired up Uridium, selected keyboard and some custom keys, and when it eventually started it was just an endless cycle of demo plays. That is, I didn't find a way to start to play.
by BigEd
Mon Oct 30, 2017 9:47 pm
Forum: bbcmicro.co.uk
Topic: Uridium ssd file not found
Replies: 21
Views: 479

Re: Uridium ssd file not found

Thanks for a quick fix!
by BigEd
Mon Oct 30, 2017 5:01 pm
Forum: hardware
Topic: BBC Master IC20 - stupid questions time
Replies: 21
Views: 429

Re: BBC Master IC20 - stupid questions time

crj wrote:
BigEd wrote:I like that. And, why else have a SYNC input?

It has the SYNC input to support ... shadow RAM for loads and stores by the VDU driver code (residing in the OS ROM C000-DFFF) but normal RAM for all other accesses.

Ah, of course!
by BigEd
Mon Oct 30, 2017 3:18 pm
Forum: hardware
Topic: BBC Master IC20 - stupid questions time
Replies: 21
Views: 429

Re: BBC Master IC20 - stupid questions time

I like that. And, why else have a SYNC input?

Go to advanced search