Re: Mac Plus floppy interface

[Patrick Schaefer <patrick.schaefer@topmail.de>]

David Empson schrieb:

> Ah yes, the PWM signal.  This goes out on pin 10 of the Mac's floppy
> connector.  Can this signal be turned off and the pin changed to an
> input?  If not, there will be a problem using a 5.25" drive, because
> this pin is the write protect input from a 5.25" drive.

The PWM signal is generated by the ASG (Mac, Mac Plus) or BBU (SE),
therefore I suppose it cannot be used as an input pin. That means you
would have to ignore /WP (writing is inhibited in the drive, so you
cannot damage a write-protected disk by accidently writing on it) or
route it to another input line.


Patrick