Search found 59 matches

by David1664
Wed Jan 22, 2020 9:58 pm
Forum: software
Topic: OS_PlatformFeatures 34 not aware of CBZ & CBNZ ?
Replies: 3
Views: 315

Re: OS_PlatformFeatures 34 not aware of CBZ & CBNZ ?

IanS wrote:
Wed Jan 22, 2020 9:45 pm
Aren't they Thumb instructions?

"information about Thumb modes is not reported"
Thank you! That would explain it.

(I obviously didn't read the docs carefully enough.)
by David1664
Wed Jan 22, 2020 9:25 pm
Forum: software
Topic: OS_PlatformFeatures 34 not aware of CBZ & CBNZ ?
Replies: 3
Views: 315

OS_PlatformFeatures 34 not aware of CBZ & CBNZ ?

I wanted to ask this over at the ROOL forum, but I've given up trying to log-in over there! I'm just curious as to why the ARMv6T2-introduced instructions CBZ and CBNZ aren't included among the list of flags returned by the SWI call OS_PlatformFeatures 34 ? Did someone forget to include them? :) htt...
by David1664
Sat Nov 23, 2019 12:13 am
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC VI for Linux with SDL: V1.22.3 released
Replies: 862
Views: 52638

Re: Matrix Brandy BASIC VI for Linux with SDL: V1.22.1 released

I've developed and focused on the kit that I have. Certainly I see no reason why it won't build on the BSDs, and at a push, Mac OS X. The GUI might be harder, but if SDL 1.2 is available, then that should also work. I've never used an Amiga (or a Mac). Others have had more success than I have at bu...
by David1664
Fri Nov 22, 2019 2:08 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC VI for Linux with SDL: V1.22.3 released
Replies: 862
Views: 52638

Re: Matrix Brandy BASIC VI for Linux with SDL: V1.22.1 released

Hi Soruk, The 'original' Brandy BASIC is listed on this page http://www.bbcbasic.co.uk/bbcbasic.html as being for "RISC OS, NetBSD, OpenBSD, FreeBSD, Linux, Mac OS X, Amiga OS, MS-DOS." Matrix Brandy BASIC is listed for "Linux, Raspberry Pi and Windows." Can Matrix Brandy BASIC also be compiled and ...
by David1664
Thu Feb 07, 2019 2:30 pm
Forum: software
Topic: Sprite routines in MODE 13 - how did YOU do it?
Replies: 34
Views: 5134

Re: Sprite routines in MODE 13 - how did YOU do it?

Old thread resurrected!

Zarchos is doing some very impressive stuff in the realm of sprite plotting.

His latest video:

https://www.youtube.com/watch?v=2kIEtbibwmA


Who would have thought this was possible BITD?


David.
--
http://www.proggies.uk/
by David1664
Mon Oct 15, 2018 6:13 pm
Forum: off-topic
Topic: Maizie Bones (new game) [BB4W]
Replies: 3
Views: 434

Maizie Bones (new game) [BB4W]

Of interest primarily to BB4W users... I recently entered a game I wrote into a code-a-game contest at SyntaxBomb: https://www.syntaxbomb.com/index.php/topic,4956.0.html Direct download (Windows only): http://www.proggies.uk/progs/zip/maiziebones.zip YouTube video: https://www.youtube.com/watch?v=0w...
by David1664
Fri Aug 17, 2018 5:20 pm
Forum: software & utilities for the pc, mac or unix
Topic: BBCSDL - Functional Differences from Other BBC BASIC implementations?
Replies: 49
Views: 3075

Re: BBCSDL - Functional Differences from Other BBC BASIC implementations ?

I still have no recollection of posting such a list, nor can I find it in a search, so I've created one from scratch! You can see it here but it's bound to be incomplete/inaccurate. Let me know as and when you find errors or omissions and I'll attempt to update it. Many thanks for that list. I'm es...
by David1664
Mon Jan 08, 2018 9:23 am
Forum: off-topic
Topic: What is the average age on here??
Replies: 281
Views: 32386

Re: What is the average age on here??

42.

(About the same number of times I've watched Star Wars: A New Hope)
by David1664
Sun Apr 02, 2017 10:53 pm
Forum: emulators
Topic: VirtualA5000 and OS_Byte 19
Replies: 3
Views: 1352

Re: VirtualA5000 and OS_Byte 19

What is wrong with the current OS_Byte 19 emulation, when you say it's not as expected? RPCEmu's OS_Byte 19 emulation works fine, and I was mistaken to state otherwise. A bit embarrassing really as I use RPCEmu quite a lot... Have you tried RedSquirrel's A5000 emulation? Many years ago, yes. I star...
by David1664
Sun Apr 02, 2017 4:29 pm
Forum: emulators
Topic: VirtualA5000 and OS_Byte 19
Replies: 3
Views: 1352

VirtualA5000 and OS_Byte 19

Does VirtualA5000 support/emulate OS_Byte 19 (wait for VSync)? It's a pity that RPCEmu doesn't seem to (Arculator certainly does), otherwise I'd carry on using that. If I'm mistaken here then please do correct me. :) EDIT : I was wrong about RPCEmu not emulating OS_Byte 19! I'm not sure how I came t...
by David1664
Sun Mar 19, 2017 7:33 pm
Forum: software
Topic: Stunt Racer 2000 frame rate
Replies: 19
Views: 2729

Re: Stunt Racer 2000 frame rate

Are there any technical reasons why the author(s) of SR2000 couldn't have made the game frame-rate independent - using delta time, integration or whatnot? I know this tends to lead to very variable frame rates from one moment to the next, but at least objects appear to move at the same speed regardl...
by David1664
Mon Mar 06, 2017 4:27 pm
Forum: software
Topic: OVERLOAD really a well written game
Replies: 9
Views: 1919

Re: OVERLOAD really a well written game

[OT] Jon, if you get a spare moment, would mind recording a video of yourself playing ' Kerbang! ' by Eterna? I looked for videos of this game on YouTube and elsewhere, but couldn't find any. I read one or two reviews of it BITD which were somewhat less than positive, but yesterday I watched a YouTu...
by David1664
Wed Oct 12, 2016 1:31 am
Forum: software
Topic: ADFFS 2.59 released
Replies: 2
Views: 698

Re: ADFFS 2.59 released

Many thanks for the new release, Jon. It's been several months since I last booted up my somewhat dusty RPi2, and this gives me an excellent reason to do so again!


David.
--
by David1664
Wed Aug 31, 2016 3:27 pm
Forum: software
Topic: Where to find Arc version of Thrust?
Replies: 4
Views: 1278

Re: Where to find Arc version of Thrust?

Zarchos: Yes, that's the one! Many thanks.

Paul: I must admit that I too found watching that video a slightly frustrating experience. It turns out that I couldn't play it any better than he did!


David.
--
by David1664
Wed Aug 31, 2016 6:17 am
Forum: software
Topic: Where to find Arc version of Thrust?
Replies: 4
Views: 1278

Where to find Arc version of Thrust?

This YouTube video shows someone playing (or trying to play) an Archimedes version of the Beeb game, 'Thrust': https://www.youtube.com/watch?v=LCVna24oZj0 Before I saw this video, I wasn't aware this game was available for the Arc. Does anyone know where I can obtain this game? I wouldn't mind givin...
by David1664
Mon Apr 04, 2016 8:30 am
Forum: software: classic games
Topic: Question about BBC Micro/Elk version of Predator
Replies: 3
Views: 792

Re: Question about BBC Micro/Elk version of Predator

Thanks for the replies!


David.
by David1664
Sun Apr 03, 2016 3:17 pm
Forum: software: classic games
Topic: Question about BBC Micro/Elk version of Predator
Replies: 3
Views: 792

Question about BBC Micro/Elk version of Predator

Did Predator use double buffering / screen bank switching to achieve the flicker-free sprite animation and the flicker-free parallax scrolling effect with the foreground? I'm pretty sure I remember reading an interview or review where it was stated that this game used screen bank switching (which I ...
by David1664
Sun Mar 06, 2016 5:56 pm
Forum: software: classic games
Topic: Favourite/best games list
Replies: 88
Views: 19476

Re: Favourite/best games list

Elite
Citadel
Palace Of Magic
Chuckie Egg
Elixir
Hobgoblin
Galaforce
Hopper
Monsters
Camelot
by David1664
Sun Feb 28, 2016 6:43 pm
Forum: software
Topic: What were the Arc's most technically impressive games?
Replies: 14
Views: 2529

Re: What were the Arc's most technically impressive games?

Wookie : Visually, Flashback was certainly impressive (I think Dave Lawrence did the Arc port). I'm pretty sure I never had the hacked version of Zool in my possession, but I do remember seeing the rasterbarred version somewhere. As for Axis, yes that was very impressive - although a guy from TBA S...
by David1664
Sun Feb 28, 2016 1:42 pm
Forum: software
Topic: What were the Arc's most technically impressive games?
Replies: 14
Views: 2529

What were the Arc's most technically impressive games?

Which games really pushed the Arc's capabilities to its limits, and which ones had you wondering "Gosh! How on Earth did they achieve that?" ?

Which games were to the Archimedes, as Exile, Elite and Revs were to the BBC Micro?


David.
--
by David1664
Thu Feb 25, 2016 12:58 am
Forum: software
Topic: Sprite routines in MODE 13 - how did YOU do it?
Replies: 34
Views: 5134

Re: Sprite routines in MODE 13 - how did YOU do it?

For a very sparse sprite (i.e. one with mostly transparent pixels), you could 'compile' the sprite into a series of MOV and STRB instructions, thus eliminating LDRs or LDMs, and avoiding loading transparent pixels that are never plotted anyway. You would lump all the sprite pixels of the same colour...
by David1664
Wed Feb 24, 2016 11:20 am
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Back in the dark ages, I was working on various game prototypes. The only one which made it out into the wild was Blurp , and I wasn't particularly happy with that and gave up. Pity! I enjoyed the video and the upbeat tune. And yes, Maestro was a horrible showcase for the Archimedes' sound capabili...
by David1664
Tue Feb 23, 2016 8:43 am
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

My ugly preview of a demo (proof of concept in fact) from 1992, in 384 x 240, 256 colours, using hardware vertical scrolling up to 12 IIRC pixels per frame, tiles based background, playing a mod with a very slow soundtracker routine, can move 3 big shapes (using generated code routines not at all w...
by David1664
Mon Feb 22, 2016 9:34 am
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Now that the great Scorpius frame rate debate of 2016 is settled, here's a 256-colour game that definitely does run at 50 fps on an ARM2-based A3000: https://www.youtube.com/watch?v=hrPRrRHtmkA Technically it's not in the same league as Scorpius, but I don't remember many other 256-colour games runn...
by David1664
Sat Feb 20, 2016 5:36 pm
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Thanks for your analysis, Steve. I'm reminded of a brief exchange between Tom Cooper and two or three others (including myself - and quite possibly Steve(?)) at the 1995 Acorn User Show at Harrogate! Tom was playing/demonstrating his 'Wavelength' game, and someone (possibly me) asked him what the fr...
by David1664
Sat Feb 20, 2016 9:32 am
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Couldn't we have a vote on whether Scorpius runs at 25 or 50 fps on an ARM2?

I've always thought it was 25 fps, but Zarchos and I have disagreed on this in the past (I think!).


David.
--

http://www.proggies.uk
by David1664
Fri Feb 19, 2016 10:09 pm
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Does the Scorpius demo work under any Arc emulators? I've tried it with Arculator 0.99 (ARM2 setting; 4 MB RAM), but no joy. I'm sure I had it running on my laptop once before... so I just tried and it didn't work on Arculator 0.99, as you said :( However, it did work in ArcEm v1.50a (May 2003 vers...
by David1664
Fri Feb 19, 2016 7:23 pm
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Does the Scorpius demo work under any Arc emulators? I've tried it with Arculator 0.99 (ARM2 setting; 4 MB RAM), but no joy.

I so wish that I hadn't dumped my A3000 way back in 2001 :(


David.
--

http://www.proggies.uk
by David1664
Mon Feb 08, 2016 12:47 pm
Forum: software
Topic: Anyone to convert R-Type Deluxe ? STE Source is available now.
Replies: 93
Views: 7955

Re: Anyone to convert R-Type Deluxe ? STE Source is available now.

Just watched a YouTube video of a preview version of R-Type Deluxe: https://www.youtube.com/watch?v=G62htGs03GQ Modern RISC OS machines are now so fast that the entire game could be coded entirely in BBC BASIC using OS_SpriteOp to plot the sprites, with the game running at 60+ fps. The same may be t...
by David1664
Fri Dec 25, 2015 8:28 pm
Forum: software
Topic: Anyone running RISC OS on an R-PI 2?
Replies: 80
Views: 16791

Re: Anyone running RISC OS on an R-PI 2?

I have made a YouTube video of my various tinkerings with BBC BASIC (and a little ASM where strictly necessary) on the Raspberry Pi 2 during the year 2015. Most of the mini-demos show an FPS (frames-per-second) counter at the top-left of the screen, and its almost always ~60 fps (a testament to the ...