Re: Network for the GS?

[Matthew Carlson <carlson@rahul.net>]

David Empson (dempson@atlantis.actrix.gen.nz) wrote:
: In article <4m7tq9$2uf@blackice.winternet.com>,
: Zelix <zelix@winternet.com> wrote:
: >
: > What's really cool was that I was able to set up my roommate's huge
: > HFS partition on my metal BBS as a file area.  The only strange thing
: > was that the GS's speaker would click ever time I would catalog the
: > hfs volume.  Didn't get a chance to let anyone try and download stuff
: > from it...I wonder if it would have worked, since AppleTalk is at
: > 57.6k

: No it isn't.  It is 230.4k synchronous, so only 8 bits are sent for
: each character and the theoretical maximum transfer rate is 28800
: bytes per second (the equivalent of an asynchronous serial link at
: 288k bps).  The bandwidth is limited by packet and protocol overheads,
: other network traffic, reaction time of the file server, reaction time
: of the workstation, etc.
: -- 
: David Empson
: dempson@actrix.gen.nz
: Snail mail: P.O. Box 27-103, Wellington, New Zealand

Wait a minute here: 230.4k synchronous?!!!!!!

Appletalk on a Mac may be that but, on a IIGS non-accelerated?
Let us think about this, a 2.8mhz machine (2.5 or so with the ram refreshing)
that is able to transfer 1 byte in two cycles.?? 
What ever the number is, with interrupt overhead and everything else the 
chip has to do, that is a little unbelievable. I have only been able to 
get 36kbps or so out of the serial ports. 

Does appletalk on a IIGS have special hardware with DMA or something?