20 Jul
2006
20 Jul
'06
10:53 a.m.
Chuck Guzis wrote:
On 7/20/2006 at 4:38 PM Jules Richardson wrote:
Hmm, well Imagedisk doesn't seem happy with it in present state at least - but
an attempt to read a disk image results in it thinking for a while and then
coming back without an error, but with nothing read, so it would seem that
data transfer from the second controller's not working at the moment...
(actually, 'test RPM' doesn't work either, which presumably just uses an
interrupt rather than any transfer of data)
I'll give linux a try just to rule out an imagedisk problem. As I say though I
think the linux driver assumes that both FDCs are using the same IRQ/DMA, and
I don't think I can change the IRQ/DMA for imagedisk at all (Well, not without
a recompile)
hardware - bah! ;)
cheers
Jules
... and I'm not sure if I need to change the
IRQ and DMA lines too....
On a well-behaved PC XT/AT FDC, bit 3 of the DCR is supposed to tristate
the IRQ and DRQ lines, so two or more FDCs can share the same IRQ and DMA
selections. Not all controllers do this, however, so it's best to check.