🚀 go-pugleaf

Jumpers W17 to W20 select factory drive tables.  These are only useful if you
are low-level formatting the drive with a pre-selected configuration rather
than dynamically configuring the drive.

            First drive     Second drive     Heads     Cylinders
Jumper >>    W17   W18       W19   W20
             in    in        in    in          4           612
             out   in        out   in          4           306
             in    out       in    out         2           615
             out   out       out   out         4           615     (default)

Jumpers W21 and W22 set the controller and BIOS address:
     W21     W22     Controller     BIOS
     out     out      320-323       C8000-C9FFF     (default)
     in      out      324-327       CA000-CBFFF
     out     in       328-32B       CC000-CDFFF
     in      in       32C-32F       CE000-CFFFF


Jumpers W25 and W26 are always out.

Jumper W27 selectes the interrupt number:
     W27
     in     IRQ2
     out    IRQ5     (default)

According to the manual, "W28 allows the controller to operate with an XT
computer when the jumper in OUT".  The jumper should also be OUT if you are
using the controller with anything higher than an XT (such as 286/386/486).

To low-level format a drive, start up DEBUG and enter:
     g=c800:5




--
     -- Andy
robinson@cs.psu.edu