Hi Chris,

Firstly let me thank you for posting the MOS disassembly that Ric
Holne sent to you. I'll be working on a MOS to boot from my compact
flash card next month, it seems easiest to add some code to MOS to
make the CF card drive 4 then any existing software will just treat
the CF like another floppy (with partitions as separate disks for
now). I'll also look into getting some adaptors made up but that will
take some time yet.

I've got a newer version of the "Compact Flash Access Guide" to post
with some corrections and new programs, there were some anomalies with
data transfer that I wasn't aware of until I did some testing. I also
found some Compact Flash breakout boards available here
http://www.sparkfun.com/commerce/product_info.php?products_id=493 they
might be suitable for my CF to Pipe adaptor if you can't wait for me
to get boards done. They are certainly easier than trying to solder to
the tiny pins of the CF holder.

> In one way or another I was totally side tracked, confused and
> reported problems that didn't exist.

I know that feeling all to well.

> I understand this to mean that the high on pin 1 strobe would be
> mainly off and only going on for short bursts when data has been put
> on the data lines. I have tested this with the BBC4W program and by
> using strobe from pin 1 to power an LED. Strobe from my Einstein
> stays permanently high.
>
> This could be a fault with my Einstein.

I believe you're right it should go low in between each of the pulses
unless the 74LS123 has failed. Have you tried using a printer
connected to the printer port? That might be the easiest way to test
the port.

> I'll upload the example programing to files as soon as I've made them
> more tidy than they are at the moment. They will be provisional and
> still rudimentary. Spare space in the Einstein above the transient
> program area will be needed for the code and some scratch pad bytes
> for serious implementation. At the moment they just show an example
> of how user port interrupt handling can be made.

Thanks again for all your work, I can't wait to see this working.

Regards,
Geoff

>
> Regards Chris Coxall
>
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