Date   : Sat, 18 Mar 1995 12:40:14 +0000 (GMT)
From   : amh15@... (Alan Hart)
Subject: Re: Snapper

> I've got a problem with snapper that I can't solve. It works fine
> on level 1, but on level 2 the "monsters" alternately move and then
> stand still with a period of about 1/2 second. On about level 4 
> they just stand still.
> 
> I know snapper relies on bit 7 of &FE40 toggling, but I _think_ I
> am emulating that correctly. Any other ideas?

I once plugged a Concept Keyboard into the user port of a BBC Micro and 
discovered that Snapper ran at high speed. Your problem almost certainly has 
something to do with the user 6522 (is that FE40?).

I hope that's at least some help to you.

Alan

Alan Hart - amh15@... - Cambridge University, UK - +44 1223 515460