MAMEWorld Forums - News - Re: DU: This magnet moment, so different and so new

> > Thanks to Miguel Bragado and Recreativas.org we got dumps of 3 Magnet System games,
> > The Burning Cave, A Day in Space and Paris Dakar.
> >
> >
> >
> >
> >
> > Hammy dumped a bootleg of Galaxian
>
> Paris Dakar disk is dead, and the first tracks aren't giving good reads, might not be
> usable at all since that's where the game code is on the disk.
>
> Burning Cavern gave 3 identical reads so is presumably good
> http://mamedev.emulab.it/haze/pics2018/burn_00.png
> http://mamedev.emulab.it/haze/pics2018/burn_01.png
> http://mamedev.emulab.it/haze/pics2018/burn_02.png
> http://mamedev.emulab.it/haze/pics2018/burn_03.png
>
> A Day In Space gave 3 inconsistent reads, although 2 are identical right up until
> near the end, which might no longer be game data (needs checking) so we have
> something usable, but potentially errors later in it
>
> http://mamedev.emulab.it/haze/pics2018/dayspace_00.png
> http://mamedev.emulab.it/haze/pics2018/dayspace_01.png
> http://mamedev.emulab.it/haze/pics2018/dayspace_02.png
> http://mamedev.emulab.it/haze/pics2018/dayspace_03.png
>
> There was also another War Mission dump, which seems to be a different code revision.
> (read consistently 3 times too)

just a follow-up

Paris Dakar disk has visible damage, we'll need another, can't get valid code from that one. (Another might have been sourced, we'll see, but there's no guarantee it will be a better disk, or the same code revision)

Day In Space was re-read with another drive, which interestingly gave consistent reads, and re-read with the magnet drive a few times, which didn't. The inconsistency is still in later unused area tho. What's very curious is there's one byte, right in the middle of the game data that reads consistently, but different for each drive, needs manual inspection.

We're dealing with old media here, where they squeezed more onto the disks than should have been possible by over-clocking the controller by 25% meaning they're even more error prone than they should be, all good fun :/