Search found 1820 matches

by BigEd
Mon Jun 18, 2018 6:06 pm
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 658

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: 658

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: 658

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: 2568

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: 13
Views: 247

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: 5
Views: 140

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: 658

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: 658

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: 658

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: 658

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...
by BigEd
Sun Jun 17, 2018 8:17 am
Forum: programming
Topic: English wordlist checker
Replies: 2
Views: 78

Re: English wordlist checker

I like it! A cromulent idea. With some code for stemming you could do a bit better, I think: forming plurals and gerunds, with a list of irregular cases, so your filter needn't deal with a full vocabulary as-spelt-out.
by BigEd
Sun Jun 17, 2018 7:32 am
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 658

Re: Post editing

I agree that the footer is a bit less useful now as a warning flag - although I'd normally not worry about edited posts, unless it's a heated argument. Cosmetic edits are always fine, of course, but if a few minutes has passed, adding a 'one more thing' might well be missed by people who got a notif...
by BigEd
Sun Jun 17, 2018 7:27 am
Forum: stardot.org.uk
Topic: Post editing
Replies: 59
Views: 658

Re: Post editing

I imagine this isn't an option, but in some forum software you get free edits for the first 10 minutes or so - after which the behaviour changes. There is a facility here called 'save draft' - presumably you can edit your draft... But is it annotated as an edit? Let's find out... OK saved and restor...
by BigEd
Sat Jun 16, 2018 9:43 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 36
Views: 998

Re: BBC Micro Compendium by Jeremy Ruston

Thanks for running that test!

It might be that both algorithms make a 1 or 2 ULP error on the same input argument: it looks like a complicated number when reduced to a ratio and printed in decimal, but perhaps it's a really simple number.
by BigEd
Sat Jun 16, 2018 5:25 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 36
Views: 998

Re: BBC Micro Compendium by Jeremy Ruston

It's nothing to write home about:
Basic 4r32 as shipped: sum is 2.80552831E-4, worst is 2.61333737E-5
by BigEd
Sat Jun 16, 2018 5:05 pm
Forum: software: other
Topic: BBC Micro Compendium by Jeremy Ruston
Replies: 36
Views: 998

Re: BBC Micro Compendium by Jeremy Ruston

An interesting historical anecdote is that the Chebychev-optimisation of the coeffecients was carried out by a very early version of BBC BASIC (Z80) which at that stage had no transcendental functions at all! Effectively it bootstrapped-itself, without needing any external assistance from another l...
by BigEd
Sat Jun 16, 2018 2:20 pm
Forum: off-topic
Topic: Using BBC BASIC to teach programming concepts in 2017
Replies: 29
Views: 1213

Re: Using BBC BASIC to teach programming concepts in 2017

The phrase I've picked up is "computational thinking" - the aim being that kids should be prepared to live in a world where so much is mediated by software. It helps to have some idea about what kinds of things software can do, and can't do. How to use it, and how it fails. That's related to knowing...
by BigEd
Sat Jun 16, 2018 12:54 pm
Forum: other vintage computer hardware, software and games
Topic: From fractals, over the hills and far away...
Replies: 1
Views: 71

Re: From fractals, over the hills and far away...

Human knowledge is a fractal tree... it seems very worthwhile to keep exploring new branches!

Image
by BigEd
Sat Jun 16, 2018 12:26 pm
Forum: general
Topic: Education, teachers and code clubs
Replies: 20
Views: 300

Re: Education, teachers and code clubs

I did read through an issue of that when it was mentioned previously:
viewtopic.php?f=11&t=13699
(Edit: and as I recall it was pretty good)

(My other half is helping at a code club these days, but I'm not (yet) involved in any way.)
by BigEd
Sat Jun 16, 2018 12:18 pm
Forum: general
Topic: Education, teachers and code clubs
Replies: 20
Views: 300

Re: Education, teachers and code clubs

Smalltalk certainly has an excellent pedigree - if we didn't have the likes of python, perhaps that's where we'd head after the block languages?
by BigEd
Sat Jun 16, 2018 11:54 am
Forum: general
Topic: Education, teachers and code clubs
Replies: 20
Views: 300

Re: Education, teachers and code clubs

I've read good things about Logo, like children discovering for themselves how to tackle a program by breaking it into manageable pieces. And Logo is a Lisp . That has to be a good thing! (By which I mean, it's not a toy language, and it's not an ad-hoc language. More likely to help with good habits...
by BigEd
Fri Jun 15, 2018 10:34 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 98
Views: 5032

Re: RGB to HDMI using a Pi Zero and a small CPLD

Never too late with a software-based solution! Which is not to say that anything is possible, because there are timing constraints with updating the Pi's framebuffer.
by BigEd
Wed Jun 13, 2018 2:22 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 98
Views: 5032

Re: RGB to HDMI using a Pi Zero and a small CPLD

Mode 7 will always look retro!
by BigEd
Wed Jun 13, 2018 12:24 pm
Forum: stardot.org.uk
Topic: Has Stardot been purged from Google search?
Replies: 14
Views: 269

Re: Has Stardot been purged from Google search?

I'm not so sure. This is my test. Edit: ah, it's already revisited the index page of the forum - 36 mins ago - so with a bit of luck it will re-trawl the whole archive in due course. (Total posts 202796...) Edit: a little over an hour after that first hit, there's now one thread in the results. 1467...
by BigEd
Wed Jun 13, 2018 11:41 am
Forum: stardot.org.uk
Topic: Has Stardot been purged from Google search?
Replies: 14
Views: 269

Re: Has Stardot been purged from Google search?

(I suppose we might need to wait a week or more for a re-index?)
by BigEd
Wed Jun 13, 2018 10:03 am
Forum: software: other
Topic: Bugs in log and trig functions of Basic 4r32
Replies: 8
Views: 1169

Re: Bugs in log and trig functions of Basic 4r32

Just to note: the adventure continued, with some follow-up here:
viewtopic.php?p=201814#p201814
by BigEd
Wed Jun 13, 2018 9:15 am
Forum: stardot.org.uk
Topic: Has Stardot been purged from Google search?
Replies: 14
Views: 269

Re: Has Stardot been purged from Google search?

danielj wrote:
Wed Jun 13, 2018 9:12 am
Nope. It hasn't!
One of the top hits for site:stardot.org.uk is
"Board index - stardot.org.uk - Accept privacy policy"

I wonder if robots should not have to jump through that hoop? Or is this a red herring?
by BigEd
Wed Jun 13, 2018 8:59 am
Forum: software: other
Topic: Border tracing Mandelbrot generator for the Beeb
Replies: 78
Views: 5749

Re: Border tracing Mandelbrot generator for the Beeb

litwr wrote:
Tue Jun 12, 2018 10:35 am
I am curious what is the frequency of the 2nd CPU that gets us only 45 sec?
I think the answer is here:
B-Em in Master Turbo mode but with the 2nd proc running much faster
(Which is to say, it's in emulation, presumably on a very fast x86.)