10base2 / 10baseT (again) - test-drb@ccmp.vtda.org

24 Nov 2000

On Nov 24, 23:25, Tony Duell wrote:
...
  >
 > > I'm trying to think of any interface on the Mac that is in any sense
 > > 'standard'. And no, I can't think of one...
 >
 > Their serial and printer ports are rs232 ports.  their USB is entirely
normal.
...

 The serial ports on any Mac that I've seen are not RS232. They have
 differential data lines for one thing. And I believe that the RS232
 standard specifies a DB25 connector. The Mac serial ports are closer to
 RS422 than anything, but they're not strictly RS422 ports either. 
Indeed.  Wrong handshaking for RS422.  And their DB25 SCSI isn't the same
as the original PC version, and does not meet the spec laid out in the SCSI
standard, so their SCSI is hardly a standard either.

-- 

Pete						Peter Turnbull
						Network Manager
						Dept. of Computer Science
						University of York