30 Jun
2002
30 Jun
'02
5:28 a.m.
"Peter C. Wallace" <pcw(a)mesanet.com> said:
<$20
On Sat, 29 Jun 2002, Fred Cisin (XenoSoft) wrote:
> Wouldn't it be EASIER to just design a circuit to do the job, rather
than
> trying to trace theirs?
>
> It is NOT that complicated!
>
> The existing FDC deals with drive select, seeking to track, etc.
> Then the add-on board (such as option board, Apple Turnover, Catweasel,
> etc.) takes the pulses on the data line and stores them as bits. The
rest
is software.
Actually it seems to me that if you wanted to create a universal
floppy controller, the whole FDC + bus interface would fit easily in a FPGA (with maybe some small amount of external SRAM).
This would also have
the
advantage that the whole hardware configuration could
be changed by
downloading it from the host if needed for more exotic floppy formats...
Hmm...
Good idea.
FDD --> Xilinx FPGA --> FDC
I might have to try that. After I build my EPROM programmer.
Later.
--
Phil.
philpem(a)dsl.pipex.com
http://www.philpem.dsl.pipex.com/