On Fri, 17 Sep 1999, Simon Cooke wrote: > From: David Laundon <[EMAIL PROTECTED]> > > Andrew Collier wrote: > > > Internal, in this context, refers to whether or not it is the ASIC > itself > > > which handles these ports. Eg, it handles the MIDI interactions so that > is > > > internal, but there is a seperate sound chip so those ports are classed > > > external. The floppy ports are also so a seperate chip, and I think the > > > printer ports are external too. > > > > Oh, I always thought the sound chip was affected in the same way. > > Mmmm... I think the contention comes in when the ASIC has to do the > port-decode and put that signal line out on the bus. Not 100% sure though. > So it'd affect the disc controllers, printer, sound chip, but not any other > external devices...
Oh well. You're probably right. I might have a go at actually testing some of these, if I can dig out Ian's Z-states program, I know I've got a copy somewhere... Andrew -- -- Andrew Collier ([EMAIL PROTECTED]) -- My other -- http://mnemotech.ucam.org -- .sig is a -- Part 3 Materials Science, Cambridge -- PDF file --
