Date   : Mon, 06 Mar 2006 01:15:07 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: Warning: Sad case on list!

Fragula <fragula@...> wrote:
> Have to question the interrupt bit though, Its a helluva long time ago,
> and I really should really check the circuit diagram, but I'll live
> dangerously on this one. Feel free to flame me if I'm wrong.
 
See http://mdfs.net/Software/Tube for various Tube documentation,
source and resources.
 
> There are a couple of tricks the 2Ps code does.. First the stuff in the
> host (DNFS or whatever) does its initial stuff, the 2P initialises, and
> uploads (the 2p being the initiator) replacement interrupt handlers over
> to the host, trapping IRQs and so I have read, NMIs too.
 
The host just runs a tight polling loop waiting for instruction
fron the client. The client never interupts the host. The host
interupts the client to transfer blocks of data between the two
systems.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
There are three food groups: brown, green and ice cream.