Search found 12 matches

by davidjefferies
Mon Nov 06, 2017 11:40 am
Forum: software: classic games
Topic: BBC Elite Which is the best version? Or do they differ?
Replies: 26
Views: 1551

Re: BBC Elite Which is the best version? Or do they differ?

I just double checked exactly what he said (it's at about 33mins) and he said the 'BBC Micro' version didn't have the single line redraw optimisation because they 'hadn't thought of it at the time'. Seeing as the Master version came a long time after the initial version (1986 vs 1984) then I think i...
by davidjefferies
Mon Nov 06, 2017 11:32 am
Forum: software: classic games
Topic: BBC Elite Which is the best version? Or do they differ?
Replies: 26
Views: 1551

Re: BBC Elite Which is the best version? Or do they differ?

I just couldn't think of any other explanation for how flicker-free the other rendering was! --Tom Braben says in the GDC talk he did (http://www.gdcvault.com/play/1014628/Classic-Game-Postmortem) that he and Ian had a realisation after the initial Elite release to reduce flicker. Instead of undraw...
by davidjefferies
Fri Sep 01, 2017 3:37 pm
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

it's very close to a circle. Here's the Minsky circle in red and a sine/cosine circle overlaid in yellow - almost no difference. Clever stuff.

minsky.png
by davidjefferies
Tue Aug 22, 2017 8:28 am
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

That code is actually making use of a peculiar thing called the Minsky Recurrence. Interesting, I hadn't encountered that before. The example given in the article is using the Minsky Recurrence to draw a (near)circle without the use of trig or square roots. Strange then that Bell implemented an ent...
by davidjefferies
Fri Aug 18, 2017 4:24 pm
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

indeed, here's the bit from the Elite sources that generates the table 4700.SNE:] 4720FORI%=0TO31:N=ABS(SIN(I%/64*2*PI)):IFN>=1 I%?O%=FF:ELSEI%?O%=INT(256*N+.5) 4730NEXT It only needs a sine table because cosine(x) == sin(x + PI/2). It uses 32 entries and each entry is scaled between 0 and 255. I th...
by davidjefferies
Fri Aug 18, 2017 3:37 pm
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

from recollection (I can't remember where - perhaps the source code to Elite The New Kind) one of the important optimisations that Braben (see here for who coded what http://www.elitehomepage.org/faq.htm) did in the original ship plotting routines was realising that it's OK for the ships matrices to...
by davidjefferies
Fri Aug 18, 2017 11:51 am
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

[ Like David, I'd love to know if there were any such routines copied from Elite (as Superior claimed), or even just algorithms lifted and reimplemented (multiplication/division techniques, line clipping/rendering, etc). As I said, the end results look markedly different in each game, so I'd be sur...
by davidjefferies
Thu Aug 17, 2017 5:27 pm
Forum: software: classic games
Topic: "Unfixable bug" in BBC B Elite
Replies: 54
Views: 2995

Re: "Unfixable bug" in BBC B Elite

Never heard that before either. There's some mention of a known bug in Elite in the articles about Star Clash here , but it doesn't specify its nature (though there's a suggestion that it was to do with the way the scanner plotted ships' positions). I wonder who "nix" is, and where this c...
by davidjefferies
Mon Jul 17, 2017 4:16 pm
Forum: software: classic games
Topic: A&B Computing games column
Replies: 4
Views: 465

Re: A&B Computing games column

nice one, I've bought it
by davidjefferies
Mon Jul 17, 2017 11:39 am
Forum: software: classic games
Topic: A&B Computing games column
Replies: 4
Views: 465

Re: A&B Computing games column

I've been on that site but I can only find the cover scans for A&B computing, am I looking in the wrong place?

PS good name :)
by davidjefferies
Fri Jul 14, 2017 11:09 am
Forum: software: classic games
Topic: A&B Computing games column
Replies: 4
Views: 465

A&B Computing games column

Does anyone know if there are scans of Dave Reeder's game column? I'm particularly interested in the 1987-89 era with the game development diaries, interviews with programmers and game reviews. A few of the interviews have been transcribed on http://www.stairwaytohell.com but I can't find anything m...
by davidjefferies
Sun Mar 12, 2017 3:48 pm
Forum: software
Topic: Unreleased games
Replies: 13
Views: 812

Re: Unreleased games

Stryker's Run III (Machine Love, ?) - Two versions by two different teams. One version by David Jefferies, abandoned in 1997 it was so long ago I can hardly remember but I'm pretty sure there was only ever one team working on SRIII. At some point we split with the guy who negotiated the license (Ma...

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