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by JonAbbott
Fri Jan 09, 2015 11:25 am
Forum: Pi
Topic: Disk swapping issues
Replies: 3
Views: 3733

Disk swapping issues

There are several reasons why it's difficult to swap discs in some games. The root cause itself is when a game sits in a tight loop waiting for input, be it a key or a disc change. Blowpipe, Chuck Rock and Xenon 2 all sit in loops of less than a dozen instructions; Blowpipe and Xenon 2 continually t...
by JonAbbott
Sun Jan 04, 2015 6:21 pm
Forum: ADFFS
Topic: RO5.x IOMD
Replies: 4
Views: 4504

Re: RO5.x IOMD

Finally got around to testing RO5 IOMD and to my amazement a few games actually work. RO5.20 had issues, but RO5.21 seemed better behaved. I'm not sure why that's the case, as I don't recall there being any dependency on bug fixes on IOMD. Both Zarch and Jet Fighter worked, games that write to VIDC1...
by JonAbbott
Fri Jan 02, 2015 8:52 pm
Forum: General
Topic: Game Request: Diggers
Replies: 26
Views: 18076

Re: Game Request: Diggers

I was somewhat sidetracked from this when the server trashed itself, but am now back at looking at Diggers whilst preparing the next ADFFS release. Actions left before it will work: Correct the audio fill code, which is hardcoded to the RO3.1 sound buffer addresses Add cursor support Add 26bit modul...
by JonAbbott
Wed Dec 31, 2014 4:01 pm
Forum: Pi
Topic: Codelet reentrancy
Replies: 4
Views: 3922

Re: Codelet reentrancy

Finally found the cause. As the abort handlers exit, the last two instructions switch to the aborting CPU mode and then load R0-PC. If an IRQ occurred between these two instructions, the registers became corrupt. The fix was simply to let the CPU switch the CPU mode as it loads PC via LDM ^. Testing...
by JonAbbott
Tue Dec 30, 2014 10:32 pm
Forum: Pi
Topic: Codelet reentrancy
Replies: 4
Views: 3922

Re: Codelet reentrancy

Having coded up option 5 in ADFFS 2.47, Chuck Rock, Fire & Ice etc crash still in the same place. Codelets are being interrupted, but not very often so reentrancy isn't the big issue I originally perceived it to be. In fact out of the games tested to date, BlowPipe is the only one that I can def...
by JonAbbott
Tue Dec 16, 2014 7:44 pm
Forum: ADFFS
Topic: ADFFS 2.46 beta
Replies: 0
Views: 3834

ADFFS 2.46 beta

The blitter has now been extended to support VIDC border changes and 2 pixel scrolling in 4 and 8 bit modes, James Pond now scrolls correctly for example. It also now corrects the 8bit sound layer for sample rate and period differences between what the game wants and what the hardware can support. T...
by JonAbbott
Mon Aug 25, 2014 5:30 am
Forum: General
Topic: Introduction and query
Replies: 6
Views: 5128

Re: Introduction and query

Jonskipop wrote:My favourite game, pretty much of all time and on any platform, is Elite for A3000. Is there any practical way to export old saved games meaningfully for use on the Pi version? I think I mainly need to sort out my monitor problem and fire up the old platform!
Copy them to a PC format floppy?
by JonAbbott
Sun Aug 24, 2014 12:31 pm
Forum: General
Topic: What games would you like released next?
Replies: 7
Views: 6371

What games would you like released next?

We have a lot of games in a pending state, some of which can be released. Please select the ones you'd like to see release next.

Cannon Fodder was the previous winner and has now been released.
by JonAbbott
Sun Aug 24, 2014 11:57 am
Forum: General
Topic: Introduction and query
Replies: 6
Views: 5128

Re: Introduction and query

I noticed on a thread seeking Krisalis games that you wanted Gods (Buzz Version). I think it's unlikely I have this version as I can't see 'Buzz' mentioned anywhere on the box, but I can forward photos of what I have if it is of any interest. The Buzz versions are unmistakable, they're in CD size c...
by JonAbbott
Sun Aug 24, 2014 7:38 am
Forum: General
Topic: Introduction and query
Replies: 6
Views: 5128

Re: Introduction and query

Ask away. If your first question was "Can I plug a USB flopping into a Pi and load games?" The answer is no, USB floppy drives don't support the Arc's sector size. We image the games on an original Archimedes and then usually spend months trying to figure out how to get them to run properl...