Apple ][ + but no Floppies - test-drb@ccmp.vtda.org

12 Dec 1999

--- Tony Duell &lt;ard(a)p850ug1.demon.co.uk&gt; wrote:
...
   It's a TTL
device, not serial.  
 The one does not preclude the other :-) 
Fair enough.  I wasn't specific.  I only meant that it used +5/gnd
as opposed to +/-12 (EIA levels).

...
  A PERQ 'Kriz mouse' is TTL (all signals are at
TTL levels) and it is 
 serial (synchronous clock/data) interface. A PS/2 mouse is also TTL and 
 serial (but a different flavour of serial). 
I didn't know that the PERQ used a sync-serial mouse at TTL levels, but
are you sure about the PS/2 mice?  After all, there is an adapter you can
stick on mice to adapt them from 9-pin serial to PS/2 connector, and it's
only wires, no active components.

To continue flogging this dead horse, VAXstation mice are serial but
not strictly RS-232 serial (RS-423?) and Sun mice are yet another form
of serial mouse.

-ethan

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