Search found 1839 matches

by BigEd
Sat Jun 23, 2018 4:09 pm
Forum: off-topic
Topic: Using BBC BASIC to teach programming concepts in 2017
Replies: 44
Views: 1436

Re: Using BBC BASIC to teach programming concepts in 2017

I think the answer to that might be on the lines of having taught the children to learn, they will have the skills to investigate their own interests. And perhaps some support in those investigations. But I don't know for sure. I'm sure everyone here has stacks of knowledge they gained outside of sc...
by BigEd
Sat Jun 23, 2018 3:18 pm
Forum: off-topic
Topic: Using BBC BASIC to teach programming concepts in 2017
Replies: 44
Views: 1436

Re: Using BBC BASIC to teach programming concepts in 2017

I'm a firm believer in looking around widely for examples of practice and experience. I found this short paper on the experience in Finland - it's interesting, but contains no ideal conclusion. (Finland is often mentioned as having a well-functioning education system.) The Finnish National Board of ...
by BigEd
Sat Jun 23, 2018 2:54 pm
Forum: software: other
Topic: Any short type-ins for unattended Beebs?
Replies: 81
Views: 3387

Re: Any short type-ins for unattended Beebs?

Thanks for the URLifications, Lurkio!
by BigEd
Sat Jun 23, 2018 11:38 am
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1393

Re: BBC Micro Compendium by Jeremy Ruston

Excellent - thanks for unearthing and sharing!
by BigEd
Sat Jun 23, 2018 11:35 am
Forum: software: other
Topic: Any short type-ins for unattended Beebs?
Replies: 81
Views: 3387

Re: Any short type-ins for unattended Beebs?

A slight variation... ever so slightly Jackson Pollock! I have snaps of the remaining type-ins from the Compendium. Stand by... Drawing a milk splash https://lh3.googleusercontent.com/BjWU4_t6B2eXYoSkQgZTr66RPFQGYkrQKo1fNGp5kf2j-iNZbR1YLqBRk49Z_Q7UnfbTBfoQQYJGfKABcDR7F3s7qVs79BNEXF6mdIJ4NxiuM4qr18V...
by BigEd
Sat Jun 23, 2018 9:21 am
Forum: stardot.org.uk
Topic: Post Edits
Replies: 36
Views: 854

Re: Post Edits

... more reluctant to post if it is evident to all that I have made multiple edits... I think what we see now is that some people do make lots of 'tidying' edits and some people don't. In both cases, you're in good company. I've selected the alternative theme and turned off the annotations - I also...
by BigEd
Sat Jun 23, 2018 9:14 am
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1393

Re: BBC Micro Compendium by Jeremy Ruston

Aha, I see now - I was expecting two calls to a polynomial function and then a single division, but some rearrangement has been done. It's a good idea to compute the smallest terms first when summing a series, to get better rounding - possibly there's something like that going on here.
by BigEd
Fri Jun 22, 2018 12:27 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1393

Re: BBC Micro Compendium by Jeremy Ruston

Ah, of course, the 32nd bit can be implicit. I knew that once, and now I know it again.

There's a lot to be said about converting between binary and decimal, although we don't normally need to know all the gory details. Here's an article with further pointers.
by BigEd
Fri Jun 22, 2018 9:27 am
Forum: stardot.org.uk
Topic: https certificates?
Replies: 86
Views: 4280

Re: https certificates? - ‪Embedding YouTube videos‬

1024MAK wrote:
Wed Jun 20, 2018 2:26 pm
So there is no form that works for everyone :(

Mark
I see there's an official phpBB extension for media which apparently decorates even plain YouTube URLs:
phpBB Media Embed PlugIn
by BigEd
Fri Jun 22, 2018 9:14 am
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1393

Re: BBC Micro Compendium by Jeremy Ruston

(Ahem, yes, maybe we need one more decimal digit to get a 32 bit mantissa - but I see now that we actually want a 31 bit mantissa (because there's a sign bit) which is interesting, because (if I have it right) a 31 bit rounded version of that first coefficient is 0.666666620410978794097900390625 exa...
by BigEd
Fri Jun 22, 2018 4:29 am
Forum: hardware
Topic: input latency of BBC Micro? (keypress to mode 7 update)
Replies: 4
Views: 425

Re: input latency of BBC Micro? (keypress to mode 7 update)

Interesting finding! I wonder if the intent is to filter out bouncing contacts? Or if it's an unintended misfeature which was never noticed. We'll see what others have to say over there.
by BigEd
Fri Jun 22, 2018 4:18 am
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 52
Views: 1393

Re: BBC Micro Compendium by Jeremy Ruston

An interesting exercise - and handy to have an 80-bit world to investigate it. One thought, though: I think I'm right in saying that 0.6666666201781482 is a 40-bit clean version of the constant 0.666666620178 - is the result any different if you tweak the decimal representations of the constants suc...
by BigEd
Thu Jun 21, 2018 11:31 am
Forum: software: other
Topic: Any short type-ins for unattended Beebs?
Replies: 81
Views: 3387

Re: Any short type-ins for unattended Beebs?

There are a number of visually dramatic type-ins in the BBC Micro Compendium - RobC lent me his copy and I took some snaps... https://lh3.googleusercontent.com/_X7fQDLL6EIQpkuc-pmDTkXpFHA9Z2E1LmBXi6pBsonRSCkPtvRggo-dlAyvMhux7hUIKzEgrYabPQZ8_z_uU-qmXSyk5Heb7OzwFJZd5DtUJ4nLKOUBlvb6lLXzRB0v7jaDUT5T18oP...
by BigEd
Wed Jun 20, 2018 4:14 pm
Forum: stardot.org.uk
Topic: https certificates?
Replies: 86
Views: 4280

Re: https certificates?

It mightn't be much less work than taking a screenshot, but you can also construct an image URL from the video ID:

Code: Select all

[img]https://i.ytimg.com/vi/FJHyNFhjDqY/hqdefault.jpg[/img]
Image
by BigEd
Wed Jun 20, 2018 7:07 am
Forum: wanted
Topic: Wanted: Acorn machine
Replies: 6
Views: 228

Re: Wanted: Acorn machine

MMFS is fine for all Pi second processor purposes! It's a bit awkward to deal with ADFS images but if you get some usefully pre-stuffed images from someone here you're all good.
by BigEd
Wed Jun 20, 2018 6:59 am
Forum: stardot.org.uk
Topic: https certificates?
Replies: 86
Views: 4280

Re: https certificates?

I'm afraid this idea of embedding videos in flash isn't at all a universal assist. This is what I get on my chromebook.
Chromebook no video preview.png
by BigEd
Tue Jun 19, 2018 9:31 pm
Forum: stardot.org.uk
Topic: https certificates?
Replies: 86
Views: 4280

Re: https certificates?

Just to note, on my setup, none of those work at all (Chrome on Mac) so I'd much prefer a plain YouTube link!

Edit: none of the /v/ forms work. The final one does: /watch.
by BigEd
Tue Jun 19, 2018 8:09 pm
Forum: wanted
Topic: Wanted: Acorn machine
Replies: 6
Views: 228

Re: Wanted: Acorn machine

So you need one of each really... ... but for playing with Basic programming either would do. amiga style acorn That would an Archimedes 3000 series, I think - I'm not familiar with them, but I'd be surprised if they were cheap. A very different kind of machine, again unless you're working in Basic ...
by BigEd
Tue Jun 19, 2018 7:24 pm
Forum: other vintage computer hardware, software and games
Topic: Cracking Apple II floppy copy-protection - 4am
Replies: 6
Views: 228

Re: Cracking Apple II floppy copy-protection - 4am

It turns out 4am has tweeted some highlights of especially interesting cracks: https://twitter.com/a2_4am/status/993129396520341504 Burger Time and Mr Do are among them. The Apple is special because the disk interface does so very little - so much is done in software and therefore ripe for customisa...
by BigEd
Mon Jun 18, 2018 6:06 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

Thanks - works for me!
by BigEd
Mon Jun 18, 2018 1:38 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

If you made the default theme be the one which hides the edit notification, then most people won't see it (because most people don't change defaults) and perhaps that would then increase the comfort of those people who feel a chilling effect from having the edit count be visible.
by BigEd
Mon Jun 18, 2018 12:37 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

Sounds good to me - thanks for looking into it!
by BigEd
Mon Jun 18, 2018 11:43 am
Forum: programming
Topic: 12-second Mandelbrot rendering on the BBC Master!
Replies: 107
Views: 2694

Re: 12-second Mandelbrot rendering on the BBC Master!

That's a great article Coeus, and one in a very interesting series looking at the internals of the Z80. But I believe the main reason the Z80 takes more clock cycles than the 6502 is that it takes several cycles to access memory, where the 6502 takes one. The Z80 goes through more internal states fo...
by BigEd
Mon Jun 18, 2018 9:21 am
Forum: hardware
Topic: My Turbo MMC Misadventures
Replies: 20
Views: 437

Re: My Turbo MMC Misadventures

Ouch! Glad to hear no permanent damage was done. The trick to removing ROMs is to be very gentle and progressive, lifting them as close to parallel as you can. Usually that means trying to lever up from both ends, one at a time, gradually getting it out in a dozen tiny movements. As for what went wr...
by BigEd
Sun Jun 17, 2018 11:54 pm
Forum: other vintage computer hardware, software and games
Topic: Cracking Apple II floppy copy-protection - 4am
Replies: 6
Views: 228

Re: Cracking Apple II floppy copy-protection - 4am

Some, or many, of the 4am cracks as found on the Internet Archive have a commentary of the cracking process - it's worth reading at least one or two of those.

See the *.txt file in the Show All catalogue of each title:
https://archive.org/download/MathBlaster4amCrack
by BigEd
Sun Jun 17, 2018 11:39 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

So, if a simple CSS tweak can hide the edit notices, could this be an alternate 'theme'? And would that be "quite easy" to offer as an option?
by BigEd
Sun Jun 17, 2018 4:48 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

As it's very rare that a post will be updated with nefarious intent, perhaps that's not the case to optimise for.
by BigEd
Sun Jun 17, 2018 4:47 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

Generally, I like the idea of a grace period which allows quick early edits. I'd hope we could find a period which is long enough to work for everyone. And generally I don't like late edits, because some people will miss the update. It's nice for a post to be correct, but not so nice if people see o...
by BigEd
Sun Jun 17, 2018 3:39 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 710

Re: Post editing

I know it's a pain to tweak an installation (because it risks trouble at upgrade time) but making these 'edited 99 times' footers visible only to mods and admins might be a good story. I thought I could filter them out using my brain, but my brain says it can't do it. The really useful cases are the...