Date   : Sun, 22 May 2005 16:49:34 +0100
From   : Philip Pemberton <philpem@...>
Subject: Re: 8-bit IDE i/f debugging

In message <aci1zLAxTKkCFwRa@...>
          Mike Tomlinson <mike@...> wrote:

> There is, but it's going to be so convenient to be able to bung a small
> - by PC standards - IDE disc (of which I have plenty spare) onto a Beeb.
> I'm waiting for reports that the IDE interface is debugged and working
> reliably and then will be sending an order into JGH for one.

I think I've found the bug on mine - !CS3Fx is being held LOW. Both
chip-selects high is an invalid state - most drives will see it and either
crash or just plain ignore it.
I think I've got some debugging to do. !CS3Fx should be held high, while
!CS1Fx should be used to activate the drive. 1Fx works fine, 3Fx is being
pulled into the wrong state.

It also looks like the component layout I've been working from doesn't match
the board. It looks like JGH has updated his site with the new layout map...
Time to find some more 1k resistors and wire links :-/

Later.
-- 
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem@...                        | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/          | 48xCD, ARCINv6c IDE, SCSI
... My haystack had no needle!