Problem preservating the Amiga version of "Ivanhoe" by Ocean

[realmml]

Other thread another game, this is really strange, because the original floppy works great in the Amiga, and the output by disk-analyse doesn't show anything strange as you can see:

T0.0-79.1: AmigaDOS
T80.0-83.1: Unformatted

I think the dump must be bad, because the IPF boot load a little and then remains in a black screen forever. The dump can be downloaded here:

Ivanhoe Dump

[kkrellwitz]

I took a quick look at this and the dump appears to be good, but it looks like there is a protection check against track 1. Using probe_amiga it gets decoded as a standard amigados track. I will dig into this further, but it may take some time as I do not have a lot of free time at the moment.

If you create a ctraw image using the Kryoflux software, the game loads fine in WinUAE.

[keirf]

Must be a gap protection of some sort. Identifying as AmigaDOS but then not working is the classic sign of this. Intentionally so!

Since it's an Ocean title there's a fighting chance it is rnc_gap. Give that a go.

[kkrellwitz]

Just gave it a go and It is indeed rnc_gp.

I will update the format file later with the following entry:

"Ivanhoe"
0 amigados
1 rnc_gap
2-159 amigados
* ignore

[keirf]

Done, thanks! There is a shorter valid form for this common protection:

"Ivanhoe" = rnc_gap

[realmml]

Thanks! :)