Date   : Wed, 21 Mar 2012 21:27:58 +0100
From   : kortink@... (John Kortink)
Subject: 32016 + ADFS 1.40 (take 4)

On Sat, 17 Mar 2012 15:20:20 +0100, I wrote:

>[...]
>
>One surprise. At 8 MHz, it's still not fast enough to keep
>up with maximum speed double-byte Tube transfers, although
>it does for single-byte transfers (and then 'just about',
>probably). At 10 MHz, double-byte is also fine.
>
>[...]

One more surprise (to whom it may concern) : at the original
6 MHz, 256-byte transfers are unreliable. Again, it simply
can't keep up. And at higher clock speeds, it can.

A rather unexpected failure if you ask me. 256-byte transfers
are used to copy the current language. So if there happened to
be a 32016 coded language ROM on the host, it would be unusable.

If you feel a need to witness this new snafu, simply :

a) Boot to Pandora's supervisor prompt.
b) '*Save Blah 8000+4000'.

What you should get is an exact copy of the (otherwise
ignored) BASIC ROM that the host hurls across the Tube,
regardless of the type of coprocessor. Well, not exactly.

The fallout from the lack of 8 MHz chipsets continues ...


John Kortink

-- 

Email    : kortink@...         
Homepage : http://www.inter.nl.net/users/J.Kortink

GoSDC, the ultimate BBC B/B+/Master/Electron storage system :
http://web.inter.nl.net/users/J.Kortink/home/hardware/gosdc