On Thu, 6 Jan 2005, Dwight K. Elvey wrote:
> In the past when I wanted a non-block binary transfer,
> I often had some value that I used as an escape character.
> I'd choose a low frequency value to improve throughput.
> It is simple, If you want to send a command value, you
> send the escape character, first. If you just wanted the escape
> character, you'd send it twice. For 8 bit data, you
> had 255 commands. EOF could be one of those.
> It makes a simple protocol that is easy to implement in
> code.
A perfectly good and simple protocol for a simple serial interface (i.e.
2 or 3 wires max). But I submit that the BREAK signal could have been
used, which is inline and is part of the RS232 spec for this very reason.
Anyway, dead horse is now a pile of fur. The ants are already back in
their hole and the flies have long since flown away.
--
Sellam Ismail Vintage Computer Festival
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Received on Thu Jan 06 2005 - 20:20:28 GMT