Search found 19 matches

by davidjefferies
Tue Feb 20, 2018 2:14 pm
Forum: software: other
Topic: Hacking the school Econet
Replies: 15
Views: 439

Re: Hacking the school Econet

The only other way to hack the system was to sniff the network watching out for a client sending *I AM to the fileserver, and then capturing the packets for a good couple of minutes afterwards looking for the username (if "*I AM :" was used and the password. Given that the L3 file server ...
by davidjefferies
Mon Feb 19, 2018 1:52 pm
Forum: software: other
Topic: Hacking the school Econet
Replies: 15
Views: 439

Hacking the school Econet

When we were at school my brother reckoned he knew someone at a neighbouring school who was so successful at hacking Econet that the teachers gave up and just let him have the system password. Looking back I'm not sure the story was true but it fascinated me at the time and I spent hours trying to h...
by davidjefferies
Mon Feb 12, 2018 9:54 pm
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 419

Re: Reading original RiscPC IDE drive from a modern RiscOS

I'm away at the moment but when I'm back I'll post up some info about what I've found on the harddrives and what I remember about the project from BITD. The dodgy dealings you're referring to weren't too dodgy really, just a bit of youthful exuberance :D There's some nice ideas in the game that are ...
by davidjefferies
Sat Feb 10, 2018 9:08 am
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 419

Re: Reading original RiscPC IDE drive from a modern RiscOS

Thanks for all the pointers, both Windows and Linux could read the name of the drive but thought it's size was 0 bytes. During all the plugging and unplugging there was a slight smell of burning and the drive just spun up and spun down repeatedly so I think I managed to fry it. I live in Worthing so...
by davidjefferies
Thu Feb 01, 2018 8:31 pm
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 419

Re: Reading original RiscPC IDE drive from a modern RiscOS

Thanks Boydie, that's interesting, I wasn't aware of the difference between SCSIFS and ADFS until now. I was very pleasantly surprised when the SA drive 'just worked' so it was a shame when the same couldn't be said of the RPC600 version. For now I've recovered enough data to start working on my pro...
by davidjefferies
Sat Jan 27, 2018 4:28 pm
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 419

Reading original RiscPC IDE drive from a modern RiscOS

I've got two RiscPCs, one Arm6 era and one StrongArm that I'm attempting to recover data from. They both have leakage on their motherboards so I'm trying to read their data using a Raspberry Pi running RiscOS rather than start them up. I bought an IDE to USB converter kit and plugged the StrongArm P...
by davidjefferies
Fri Jan 26, 2018 10:02 am
Forum: software: classic games
Topic: Most disappointing conversions from other systems
Replies: 51
Views: 1908

Re: Most disappointing conversions from other systems

SpyHunter. Loved playing the arcade version at the local sports center, then my mate got it on C64 and it looked (to my young eyes) as close to arcade perfect as was possible back then. Then I got it for my Beeb and, oh. arcade https://youtu.be/vSHIHaU1SfA c64 https://youtu.be/mqz881sy8YQ bbc https:...
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: 2148

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: 2148

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: 4508

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: 4508

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: 4508

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: 4508

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: 4508

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: 4508

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: 729

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: 729

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: 729

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: 1336

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...