Does the A3000s SCSI interface support “Fast SCSI”?
A. [by Ralph Babel] No, but upgrading it to do so is *extremely* simple: First, replace the standard WD33C93A SCSI chip by a WD33C93*B*. Be sure to provide the appropriate input clock on pin 7 (DIP) as described in section 3.1.16 of the WD33C93B data sheet. Finally, rewrite Commodore’s scsi.device driver to select the proper clock divisor (see section 3.1.3); take the new input clock into account when dealing with incoming and outgoing SDTR messages, and set the WD’s FSS bit accordingly. The driver should replace the one in ROM.
