Re: Network for the GS?

[Michael Mahon <mahon@cup.hp.com>]

Matthew Carlson wrote:
> 
> 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?!!!!!!
> 

Read before posting!  David said 230.4 k *bits* per second, equivalent
to 28.8 k *bytes* per second.

> 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?

-- 
-michael

===============================================================
This is my personal opinion, and does not in any way represent
the position of my employer, etc...