To be or not to be FDS headers

Discuss technical or other issues relating to programming the Nintendo Entertainment System, Famicom, or compatible systems. See the NESdev wiki for more information.

Moderator: Moderators

Post Reply
Pennywise
Posts: 71
Joined: Tue Jul 14, 2009 11:04 am

To be or not to be FDS headers

Post by Pennywise »

So, I was just curious as to why there's an extra 10 bytes with FDS at the beginning of an FDS image? I've seen it with and without and it looks mostly useless when present.
User avatar
rainwarrior
Posts: 8732
Joined: Sun Jan 22, 2012 12:03 pm
Location: Canada
Contact:

Re: To be or not to be FDS headers

Post by rainwarrior »

Pennywise wrote:So, I was just curious as to why there's an extra 10 bytes with FDS at the beginning of an FDS image? I've seen it with and without and it looks mostly useless when present.
It's true that it does not contain any useful information, as the number of sides can be deduced from the file size (as can the presence or non-presence of the header).

I can't say what the historical reason was. Someone in the past decided to change it, but most emulators now seem to support both versions of the .FDS format. It seems fairly innocuous to me?
Post Reply