BG> What's the story with EPROM copying these days,
BG> do you need highly specialised equipment, or what?

Well, you obviously need an eprom burner. But thats so obvious
that I have presumably missed the point of your question.

BG> The Sportie's EPROM appears to be a fairly standard 256Kb job,

Thats fine, thats what the bulk of the common ones are.

BG> and I wonder, do they generally copy first
BG> time, every time without any problems?

Yes.

BG> Also, can they be altered slightly, if required?

Yes. The usual thing is a two step process, particularly with a
cheaper eprom burner with a single socket. You normally capture
the original to a disk file and burn another from that file. So
you can do what you like to the disk file between capturing it
and burning a new one. They are normally just a block of bytes and
you can edit with any normal binary editor like Nortons DiskEdit.

You can just save eproms to a disk file for later use too.
@EOT:

---