Richard Erlacher wrote:
> There's nothing to tweak, since it's all-digital, and, eventually, but not this
> week, I can probably send you a scan or a PDF of the datasheet. The original I
> have is a preliminary, but I might still have a datasheet from the ChipCenter or
> Freetradezone. What I really like is that there is no need at all for cable
> drivers, since the interface lines are intended for direct connection. All you
> have to do is synchronize your CPU/DMAC to the data acquisition loop and then
> roll. If you're slow, you may want to use wait-states, but if you have no
> dificulty getting around a 13.5 microsecond loop (the first pass only) and 16
> microseconds per byte, then you're in.
Having looked at a few other Floppy disk datasheets for the pc, I would
suspect
it needs a 24 Mhz clock. I can divide this by 2 to give me 12 Mhz clock
for the
CPU - 333 ns memory cycle. If I stick with the WD part I will run the
cpu _at_ 16
Mhz (250 ns memory cycle) and divide by 16 for the floppy clock. One
advantage
of WD part is that I can find source code from SS-50 bus computers to
help
with software development.
--
Ben Franchuk --- Pre-historic Cpu's --
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Tue Dec 18 2001 - 12:01:30 GMT