Apple ][ + but no Floppies

From: Ethan Dicks <>
Date: Sun Dec 12 12:41:05 1999

--- Tony Duell <> 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.


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Received on Sun Dec 12 1999 - 12:41:05 GMT

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