Search found 570 matches

by sirbod
Wed Jul 12, 2017 10:32 am
Forum: wanted
Topic: Archimedes World
Replies: 2
Views: 184

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: 170

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: 374

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: 328

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: 328

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: 309

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: 147
Views: 8090

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: 309

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: 309

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: 309

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: 547

Re: RiscOS 2, A420/1 and Zarch

by sirbod
Mon May 08, 2017 1:01 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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: 622

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: 147
Views: 8090

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: 719

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: 719

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: 719

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: 147
Views: 8090

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...
by sirbod
Thu Apr 27, 2017 4:34 pm
Forum: software
Topic: Stunt Racer 2000 frame rate
Replies: 13
Views: 622

Re: Stunt Racer 2000 frame rate

I've put up a short video showing the changes made and what it runs like at 50fps.
by sirbod
Wed Apr 26, 2017 9:18 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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

I've knocked up a dither test, which looks truly awful. It currently doesn't rotate the dither based on Y as the line fill doesn't know what it is - I'll need to modify the triangle routine to resolve that. When calculating the dither table, I'm not checking the distance between the two chosen colou...
by sirbod
Wed Apr 26, 2017 5:58 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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

There's no requirement to do gamma correction. Calculate the distance of all palette entries from the required RGB: D=(R1-R2)^2 + (G1-G2)^2 + (B1-B2)^2 and then find the pair with the lowest distance from both each other and the required colour when combined. I was hoping someone had already coded s...
by sirbod
Wed Apr 26, 2017 9:46 am
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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

Does anyone have some code to select the optimal two palette entries to use for a 50% ordered dither in MODE 13? I'm redefining the VIDC palette, so need to pick two entries from a 256 entry table that combined, provide the lowest delta from the required colour, but not too far from each other that ...
by sirbod
Tue Apr 25, 2017 5:02 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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

I don't know if you're doing it already (or considering it), but dithered colours would also be a good way to expand your perceived palette (with a ROR#8 on the colour register between each line). Are you still using ColourTrans, or are you building tables yourself now? Remember, gamma correction c...
by sirbod
Tue Apr 25, 2017 4:56 pm
Forum: software
Topic: AnyMode v0.04b released for RISC OS on the RPi
Replies: 10
Views: 1066

Re: AnyMode v0.04b released for RISC OS on the RPi

I am having trouble with AnyMode, placed it in the right directory but my screen goes completely black when starting a game and need to reboot the Pi. Tried it with two monitors as well, any ideas guys? Thanks! (Using it for ADFFS) If you're running a recent build, have you done the following: &sdo...
by sirbod
Tue Apr 25, 2017 4:52 pm
Forum: emulators
Topic: ArcEm running too fast on RiscOS on Raspberry Pi
Replies: 7
Views: 404

Re: ArcEm running too fast on RiscOS on Raspberry Pi

Twin World can be patched to run on a Pi.

Depending on how ArcEm is handling VSync, you might be able to run ADFFS within the emulation and use CTRL-SHIFT-PgUp to slow games down. It's not something I've tested, but would be interested to know if it works.
by sirbod
Tue Apr 25, 2017 2:01 pm
Forum: software
Topic: Hacker needed ... for Zarch ;-)
Replies: 147
Views: 8090

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

I've posted a video on YouTube discussing the issues, investigation undertaken to date and demonstrating what it looks like on a Pi.
by sirbod
Mon Apr 24, 2017 10:20 am
Forum: software
Topic: Different versions of Zarch?
Replies: 13
Views: 675

Re: Different versions of Zarch?

I thought there was an updated version created when they upgraded the ARM processor in the Archimedes? I'm sure it was because the original version glitched or ran too fast on the new hardware. Is this true? Not true I'm afraid, only two versions were released. The original and the Play It Again Sa...
by sirbod
Tue Apr 04, 2017 7:40 am
Forum: hardware
Topic: RiscPC 600
Replies: 4
Views: 239

Re: RiscPC 600

Hard to tell from either photo if that's a manufacturing defect or blistering caused by acid, the chip looks like it has acid residue on it so could do with a clean in that area just to be in the safe side. Your mouse pointer looks okay in the screenshot, you mentioned it was always corrupt in the O...
by sirbod
Mon Apr 03, 2017 7:56 am
Forum: hardware
Topic: RiscPC 600
Replies: 4
Views: 239

Re: RiscPC 600

I had an identical issue on my Kinetic a few weeks ago, it turned out to be a poor connection with the VRAM. The quick way to test this is to simply remove the VRAM and see if you get a display, if you do, thoroughly cleaning all the contacts and VRAM pads. If that isn't the problem, track corrosion...
by sirbod
Sun Apr 02, 2017 6:59 pm
Forum: emulators
Topic: VirtualA5000 and OS_Byte 19
Replies: 3
Views: 317

Re: VirtualA5000 and OS_Byte 19

I tested most emulators for gaming compatibility, Arculator and Red Squirrel are the only two worth using. Since I did the tests, Arculator has had some major source code updates, particularly around CPU instruction timing and JFD support, but isn't yet available as a binary download. It still suffe...

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