Alternative Hardware Design for Floppy Interface
cclist at sydex.com
Mon Oct 22 12:55:58 CDT 2007
On 22 Oct 2007 at 18:11, Jules Richardson wrote:
> Hmm, I thought all modern machines emulate a parallel port connected via an
> ISA bus - i.e. it's still slow compared to the rest of the machine, and a
> modern xGHz system won't drive the port any quicker than a syatem of ten years
If it's an IEEE 1284-conforming port, then it can execute at least 2M
transfers/second, which should be sufficient for most 5.25" DD and SD
floppies. If you want to get more exotic, add some RAM (like the
Catweasel) or a FIFO. Still no big deal.
> > At least on the CW MK I and MK III, most of the board is taken up by
> > Amiga-realted nonsense like joystick ports and SID sockets.
> That's another thing putting me off a CW... I just want a floppy-access
> device, not half an Amiga thrown into the mix.
Then get a CW MK4 - Jens has left all of the Amiga stuff off of it.
The MK3 was interesting in that it was a "flippy" card--you could
plug it into a PCI bus or whatever the Amiga used for a bus.
As I said, it's not rocket science and even a USB catweasel reader
can probably be constructed easily with off-the-shelf components. If
a standard is needed, the only things I can really think of are the
meaning of the high-order bit (in the CW, it's the presence of the
index signal) and the clock frequency used (the CW, depending on
model, uses two or three fairly odd ones--probably related to the SID
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