Apple ][ + but no Floppies

From: Pete Turnbull <>
Date: Sun Dec 12 15:41:17 1999

On Dec 12, 10:41, Ethan Dicks wrote:

> 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.

Those which are completely passive only work on certain dual-function mice,
in which the PIC can detect the change -- by detecting the voltage on a
different pin -- and act accordingly, changing the protocol. In general,
you can't turn any old serial mouse into a PS/2 mouse, nor vice-versa.

To further confuse, there are at least two pinouts for such adapters.

However, there are some active adapters, which themselves contain a
processor (usually a PIC) which will convert the serial protocol into PS/2

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York
Received on Sun Dec 12 1999 - 15:41:17 GMT

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