To use Catalyst 2.0 with the Apple III and hard disk drives other than the ProFile, you need to change the driver configuration block of the .CATALYST driver as follows: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- (See notes just below) 00 8F 97 8A 91 93 23 17 17 F6 00 B8 Notes: 00 - Slot number 01- Unit number 02 - Type 03 - Sub Type 04 - Low Byte, Manufacturer's ID 05 - High Byte, Manufacturer's ID For a 10 megabyte ProFile, copy the information in bytes 00 through 05 from the existing Catalyst hard disk driver configuration block (DCB) of the Catalyst driver that you are using. For a 10 MB Profile, the DCB should look like this: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- slot 00 01 01 23 00 00 8F 97 8A 91 93 23 17 17 F6 00 B8 For a 5 MB Profile, the DCB should look like this: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- slot 00 D1 01 23 00 00 8F 97 8A DD 93 23 E8 17 F6 3B C3