Ancient knowledge for free! (sort of)

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By Hrothgar

Champion (479)

Hrothgar's picture

06-07-2010, 19:51

Check. I should not forget that sprite handling only needs to happen as frequently as the page swaps in games were software sprites don't move smoothly.

I suppose this is one of the handicaps of e.g. smoothly scrolling games with hardware sprites, where you most likely will need some sprite handling and collision detection routines each frame.

By Manuel

Ascended (18239)

Manuel's picture

10-07-2010, 22:51

Older Parallax gems: ARC, proof that it got emulated in openMSX: http://www.youtube.com/watch?v=pNZp5NvDkJ0
And Akin has a 'stray white pixel' problem, which BiFi fixed: http://www.youtube.com/watch?v=yX6_EdTp--g

parallax: did you ever expected to see ARC emulated? :)

By parallax

Expert (85)

parallax's picture

11-07-2010, 13:35

About ARC emulation: Well, in a way it surprises me that it remained elusive for so long. I was 15/16 when we did all that, and now I would have done a much better job...
Also, such hacking is much easier when you can just run the game in a virtual machine/emulator. So it doesn't surprise me that it was hacked, and it's clear that it's easier to do using more powerful tools. I don't know what this thing does, but in an emulator you can simulate hardware (which is quite a different job from modifying the software to run on a real MSX). By the way, does the whole game work? I recall I put if different tests at different points.

I don't know the details about the solution to the white pixel problem, but I'd be interested in knowing what was the real cause and solution. BiFi?

By Manuel

Ascended (18239)

Manuel's picture

11-07-2010, 18:28

By the way, does the whole game work? I recall I put if different tests at different points.

As far as we know it works completely. BiFi played it for quite a bit and didn't find any problems yet. But he didn't get *that* far. I urged him to use the reverse function to help him out a bit Smile

He did find interesting stuff in the 32kB EPROM the cartridge contains, quoting "some checksum stuff and the replayer code... and, strange enough, part of the NMS8250 BIOS"...

Do you remember what was going on there, Cas?

I don't know the details about the solution to the white pixel problem, but I'd be interested in knowing what was the real cause and solution. BiFi?

I'm sure he'll contact you about this.

I was 15/16 when we did all that, and now I would have done a much better job...
So, how would you make such a copy protection today?

By FiXato

Scribe (1717)

FiXato's picture

11-07-2010, 19:14

Another ARC related question: was there a manual released with it? BiFi, Edwin_, me and Bodyhammer all don't have a manual with our boxes, so I'm starting to wonder if there ever was one. Tongue

By robertwilting

Champion (467)

robertwilting's picture

11-07-2010, 23:58

ARC's manual is on the disc. It's not supposed to come with a printed manual. At least that is what the reviews in the ancient magazines say.

By FiXato

Scribe (1717)

FiXato's picture

12-07-2010, 10:56

Ah, makes sense. Smile

By Haohmaru

Paladin (773)

Haohmaru's picture

12-07-2010, 19:57

Yes, sorry if I somehow managed to not tell you earlier Wink

By FiXato

Scribe (1717)

FiXato's picture

12-07-2010, 22:44

(C) 1990; so the game is 20 years old now Big smile

By parallax

Expert (85)

parallax's picture

13-07-2010, 15:52

20 years? Maybe I should celebrate something then Smile Ah well, I already missed out celebrating for Vectron (1989).

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