Date   : Sun, 05 Oct 2003 13:06:00 +1000
From   : "Bob Devries" <bdevries@...>
Subject: Re: XFER v4 problem

Angus Duggan writes:
> Sorry, I've not being tracking this particularly closely. Is this sending
to
> or reading from the BBC?

Sending to the BBC.

[SNIP]

> If the problem is in sending to disc, this could be the problem,
especially
> if your disc on the BBC end is slow. There is a 1 second sleep per 0.5Kb
> sent. This may not be enough, and it may be possible for the sleep to
happen
> at the wrong time (thus missing CTS line changes). I've always preferred
> hardware handshake using CTS/RTS when making up serial cables.

Well, I'm going to try it on the other BBC I just got, to see if it behaves
differently.

> I have been meaning to think about making the protocol more robust by
> introducing block confirmations, block CRC checking and re-sends, but
haven't
> yet put the effort into working out a design that is robust from both
ends.

Yeah, I guess that block ACK/NAK would be a good move.

Regards, Bob Devries; Ipswich, Queensland, Australia