After seeing a drive for sale that had switches to set the drive number as high as 15, I started looking into it. But I cannot seem to get the details I need. The HW "jumpers" inside a 1541 or 1571 drive just open or short pins on a VIA chip to ground to set the drive number via HW. The pins (on the 1571 I'm currently looking at,) are 15 & 16 which are PB5 & PB6 (peripheral B port bits 5 & 6 of 0-7 **correction, 7 not 8**.) These allow setting device numbers 8-11 (8 if both shorted to ground, 9 if PB5 is opened, 10 if PB6, & 11 if both.) The drive (a 1581 clone I came across,) allows up to 15, it would seem logical that PB7 would also have an effect, but I'm not really wanting to experiment with real HW without better information.
Does anyone know exactly how drives (any/all really, but mainly working with 1571 & 1541 drives right now,) set the power on device number with the PB pins on this VIA 6522 chip?
Edited by Pheonix, Wed Apr 17, 2019 10:46 PM.