Description

This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.

09.016 I have one 5.25" drive connected to my GS, but the System 6.0.1 Finder display shows two 5.25" icons!? How can I fix this?

         You need to change the AppleDisk5.25 driver file's auxilary filetype from
$010E to $0101. You can use File Manager (an NDA utility) to make the change.

     For a standard GS/OS device driver, the lower six bits specify the number
of devices supported by the driver (see the file type note on GS/OS drivers:
FTN.BB.XXXX), so the maximum number of devices that can be supported by a
single driver is 63.  You should NEVER increase this higher than the original
value, because the driver probably doesn't have space in its device tables to
support more drivers than it originally claimed to.

     The AppleDisk5.25 driver supports a maximum of 14 devices - two 5.25"
drives for each available slot.  (In theory, it should be able to support 16:
all seven real slots, plus the built-in disk port, but Apple never completed
the implementation of dynamic slot switching for drivers, probably for
compatibility reasons.)

     Don't change any of the higher order bits.  The high order byte specifies
the type of driver ($01 = GS/OS device driver), and the top two bits of the low
order byte specify the type of GS/OS driver (00 = standard).

NOTE: All of the above applies ONLY to GS/OS standard device drivers, not to
GS/OS supervisory drivers, printer drivers, or anything else. See the filetype
note for further information.

     There is one bit in the auxiliary type which is the same for all types of
drivers: bit 15 set ($8000) indicates the driver is inactive (this is what
Finder toggles when you click on the "Inactive" check box).

By:  Neil Parker
    

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