Search found 582 matches

by sirbod
Fri Sep 22, 2017 7:48 am
Forum: hardware
Topic: NuLA demos
Replies: 116
Views: 3365

Re: NuLA demos

You don't actually need to change any code in a game to get it to work. All you do is program the palette before loading the game and the colours will be changed. I was thinking more of modifying an existing game to make use of NuLA as it transitions levels, or making use of the extra palette entri...
by sirbod
Thu Sep 21, 2017 10:05 pm
Forum: hardware
Topic: NuLA demos
Replies: 116
Views: 3365

Re: NuLA demos

Has anyone managed to modify any existing games to use this?
by sirbod
Mon Aug 28, 2017 3:02 am
Forum: hardware
Topic: Chipset datasheets (A3000)
Replies: 2
Views: 109

Re: Chipset datasheets (A3000)

Try the Archimedes Level Hardware section for the VLSI chipset manuals.
by sirbod
Sun Aug 27, 2017 1:13 pm
Forum: hardware
Topic: A7000 floppy / HD issues
Replies: 9
Views: 582

Re: A7000 floppy / HD issues

Seems it's not as fixed as I first thought. Managed to reinstall !Boot and had it all working after several reboots. After a power cycle however it goes back to reporting "Disc not understood - has it been formatted?" I've had another look at this today and although the CD-ROM was working...
by sirbod
Sun Aug 27, 2017 10:02 am
Forum: software
Topic: RISC PC - What version of RISC OS do you use?
Replies: 6
Views: 306

Re: RISC PC - What version of RISC OS do you use?

I'd be really interested to know which softloader you used in the end? I tried to achieve this set up a year or two ago, but gave up because I couldn't find a softloader which worked for all... It'd be great to give this another try :) Good question and one I don't know the answer too as they're no...
by sirbod
Thu Aug 24, 2017 6:49 am
Forum: software
Topic: RISC PC - What version of RISC OS do you use?
Replies: 6
Views: 306

Re: RISC PC - What version of RISC OS do you use?

You can't softload anything higher than 4.02 over 3.7 ROMs... That isn't strictly true, I setup my test RiscPC which has 3.7 in ROM, to softload every official OS build release, up to the latest nightly 5.23. !Boot remains the same across them all, but the softload sequence does restore the CMOS fo...
by sirbod
Mon Aug 14, 2017 3:31 pm
Forum: hardware
Topic: A7000+ bring up to life + A3010 issues
Replies: 17
Views: 482

Re: A7000+ bring up to life + A3010 issues

HD works ok, so does CDROM, only floppy is giving problems, but need to check if there is problem with traces Mine started as just the floppy failing to be detected, then a year later progressed to the HD also not being detected so it's possible its the same traces at fault. The three in question r...
by sirbod
Sun Aug 13, 2017 10:51 pm
Forum: hardware
Topic: A7000+ bring up to life + A3010 issues
Replies: 17
Views: 482

Re: A7000+ bring up to life + A3010 issues

Any ideas why A7000+ does not detect 3.5" floppy anymore? Have a look at my A7000 floppy / HD issues thread, it's possible it's the same problem. I managed to get the floppy and HD to work, provided you don't restart. After a restart the HD is magically corrupt for some reason, but the floppy ...
by sirbod
Tue Aug 01, 2017 8:31 am
Forum: software
Topic: Installing the 3 jdf Wolfenstein files
Replies: 12
Views: 284

Re: Installing the 3 jdf Wolfenstein files

I've picked up bits and pieces of knowledge about how ADFFS works from the release notes, posts on the forums etc but is there a single place where this information can be found? Just a kind of summary of the key technical points. I know it's doing some incredible stuff and so it would be useful to...
by sirbod
Mon Jul 31, 2017 7:55 pm
Forum: software
Topic: Installing the 3 jdf Wolfenstein files
Replies: 12
Views: 284

Re: Installing the 3 jdf Wolfenstein files

I think what Jon means is, have you renamed the image files? Only the last digit of the filename is used, which denotes the disc number in sets. The ID used to run the boot script comes from the metadata within the JFD file. When I run from Obey, it runs the intro and then when I press a key, it as...
by sirbod
Mon Jul 31, 2017 6:37 am
Forum: software
Topic: Installing the 3 jdf Wolfenstein files
Replies: 12
Views: 284

Re: Installing the 3 jdf Wolfenstein files

When I do a Boot Floppy from the ADFFS file on the task bar, nothing happens at all after selecting YES from the popup window. I suspect the floppy doesn't have an ID or has the wrong ID, have a look at the Info page under the ADFFS Filer Format menu. The correct ID for Wolfenstein 3D is 10388. If ...
by sirbod
Wed Jul 26, 2017 2:56 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 149
Views: 9043

Re: Hacker needed ... for Zarch ;-)

It must be time for an update! I've not touched it since the video about dithering. I've not had any spare time to devote to it. There has been one development though. Shortly after posting the videos on YouTube, I was anonymously sent the original source code. At some point I'll see if it compiles...
by sirbod
Wed Jul 12, 2017 10:32 am
Forum: wanted
Topic: Archimedes World
Replies: 2
Views: 252

Re: Archimedes World

I'd like to second this request, they will aid in tracking down publishers. I believe they also contain a few game walkthroughs I'm after.
by sirbod
Tue Jul 04, 2017 7:45 pm
Forum: software
Topic: ADFFS 2.61 released
Replies: 2
Views: 244

ADFFS 2.61 released

ADFFS 2.61 is now available from the JASPP site. 259 games now run on the Pi, 216 of which are unique.

To date, the project has released 65 previously commercial titles, of which 56 are unique. In total 377 commercial games were released for the Archimedes and/or RiscPC.
by sirbod
Sat Jun 03, 2017 12:02 pm
Forum: hardware
Topic: Which Archimedes model?
Replies: 16
Views: 478

Re: Which Archimedes model?

I would be interested in your comments as to what I should look out for, and why Get the cheapest one you can find, I wouldn't pay more than £30 if you just want to satisfy your retro calling. There's very little to tell them apart at the desktop, underneath they differ wildly in chipset and CPU, b...
by sirbod
Wed May 24, 2017 9:03 am
Forum: hardware
Topic: Question about MEMC translation tables reprogramming
Replies: 12
Views: 395

Re: Question about MEMC translation tables reprogramming

No it doesn't help because I don't see the benefits. .. With what I read here, I don't see what is good having a 'duplicate' video screen area ... (If I understood correctly, and there is a high probability I didn't). Ignoring screen edge detection... blitting a sprite when hardware scrolling witho...
by sirbod
Mon May 22, 2017 7:11 pm
Forum: hardware
Topic: Question about MEMC translation tables reprogramming
Replies: 12
Views: 395

Re: Question about MEMC translation tables reprogramming

The only potential speed up from using physical memory I'm aware of, is to avoid checking for screen overruns by allowing code to write past &1FFFFFF into the physical memory range. This is also useful for hardware scrolling, as the screen is always mapped to physical pages 0 upward, and physica...
by sirbod
Mon May 22, 2017 6:53 pm
Forum: software
Topic: Revolver release date
Replies: 9
Views: 389

Re: Revolver release date

Which issues ? I could have some duplicates I could give you. I believe one walkthrough was in Jan '93 but I'm not sure which the others are in, they may also have had maps of some games in them, again I don't know which editions. Scans of just the walkthroughs/maps would be sufficient for my needs.
by sirbod
Mon May 22, 2017 6:48 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 149
Views: 9043

Re: Hacker needed ... for Zarch ;-)

That screenshot doesn't look like it has dithering enabled to me. Is it the right one? Sure is, you can tell by looking at the colour of the ground in front of the landing pad. Without dithering, its yellow, with dithering its pale green. I recorded a video covering the dithering a few weeks ago, b...
by sirbod
Mon May 22, 2017 6:27 pm
Forum: software
Topic: Revolver release date
Replies: 9
Views: 389

Re: Revolver release date

Now that's a very useful site, thanks. I don't suppose you know of a similar site for Archimedes World? Been after a few issues for a while for game walkthroughs.
by sirbod
Sat May 20, 2017 8:12 pm
Forum: software
Topic: Revolver release date
Replies: 9
Views: 389

Re: Revolver release date

Pernod wrote:A quick Google finds it reviewed in Acorn User Christmas 1995

Oct 1995 then, thanks.

Does anyone have a copy of the magazine that could read the review and confirm?
by sirbod
Sat May 20, 2017 8:35 am
Forum: software
Topic: Revolver release date
Replies: 9
Views: 389

Revolver release date

Have any of you that have magazine collections come across a review of Revolver around its release date? In game, it states it will be available in Oct, but doesn't state which year. The files are datestamped 1900 and there's no copyright date, so no clues there. If someone could point me to a revie...
by sirbod
Wed May 10, 2017 1:57 pm
Forum: software
Topic: RiscOS 2, A420/1 and Zarch
Replies: 8
Views: 655

Re: RiscOS 2, A420/1 and Zarch

by sirbod
Mon May 08, 2017 1:01 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 149
Views: 9043

Re: Hacker needed ... for Zarch ;-)

It's not always on Wave 2, but when I have seen it If that's the case, it will be linked with the tree/building generation. Simple way to check this: ⋅ Load the game and immediately play to level 2, without demo mode kicking in ⋅ Kill yourself and play to level 2 It should appea...
by sirbod
Mon May 08, 2017 12:52 pm
Forum: software
Topic: Stunt Racer 2000 frame rate
Replies: 13
Views: 697

Re: Stunt Racer 2000 frame rate

vanpeebles wrote:Looks good, how did it play?? :D

Aside from the over-the-top bumps, it appears to be easier to control with a higher frame rate. Until I fix the recording and time, its hard to tell if this help to improve laptimes.
by sirbod
Thu May 04, 2017 9:44 am
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 149
Views: 9043

Re: Hacker needed ... for Zarch ;-)

under what conditions the sea monster shows up? I've not found the code that deals with it and it doesn't appear to be treated as an alien ship. My guess is its an object added when it builds the landscape map. If it always occurs on wave 2, then its not based on the seed used to generate the build...
by sirbod
Mon May 01, 2017 6:09 pm
Forum: hardware
Topic: Have Acorn Archimedes? Please run it for me!
Replies: 33
Views: 887

Re: Have Acorn Archimedes? Please run it for me!

steve3000 wrote:Results from my A440/1 with ARM2 (8MHz) and MEMC1a running RISC OS 3.11, in MODE 0.

The MLA version is 6% quicker with MEMC1a and non-MLA version is virtually the same speed.
by sirbod
Sun Apr 30, 2017 10:30 am
Forum: hardware
Topic: Have Acorn Archimedes? Please run it for me!
Replies: 33
Views: 887

Re: Have Acorn Archimedes? Please run it for me!

A305 ARM2 @ 8MHz with MEMC1:

MLA
100 - 0.06
1000 - 5.50
3000 - 49.65

no-MLA
100 - 0.06
1000 - 5.08
3000 - 45.02


A440/1 ARM3 @ 33MHz with MEMC1a:

MLA
100 - 0.02
1000 - 1.82
3000 - 16.26

no-MLA
100 - 0.02
1000 - 1.76
3000 - 15.63
by sirbod
Sun Apr 30, 2017 9:41 am
Forum: hardware
Topic: Have Acorn Archimedes? Please run it for me!
Replies: 33
Views: 887

Re: Have Acorn Archimedes? Please run it for me!

I've not looked at the code, but from what I've read above, the results so far from ARM2/250/3 will be inaccurate as they're probably being run in different video modes. Another thing to be aware of is the affect MEMC has on MUL/MLA in particular. MEMC1 stalls the instruction several cycles to work ...
by sirbod
Thu Apr 27, 2017 4:58 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 149
Views: 9043

Re: Hacker needed ... for Zarch ;-)

I've modified the dither colour calculation to prefer two colours that are close to each other, foreground dithering is now barely noticeable: http://stardot.org.uk/forums/download/file.php?id=29214 zarch_extra_3_front_default_palette_dither_test3.png EDIT: Updated the image with the latest iteratio...

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