Re: [PARPORT] RE: id_probe

Tim Waugh (
Fri, 30 Apr 1999 09:32:37 +0100 (GMT)

On Thu, 29 Apr 1999, Carlos Henrique Bauer wrote:

> The SPP detection code that appears in the parallel port book I own
> resets the control port bit 5 before doing the write/read test. If the
> port is a PS/2 port and the control port bit 5 is set during test, the
> outputs will be tri-stated and the value that is read back won't match
> what was written.

Yes. We should be okay there, because we write 0xc to CTR first, so bit 5
is 0.


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