Date   : Mon, 24 Jul 2006 23:33:47 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: 6502 copros again

OK, I think the copro is working... at startup I get "Acorn TUBE 6502 64K". 
System memory variables as follows:

             PAGE  HIMEM  TOP
no copro:   6400  31744  6402
with copro: 2048  32768  2050

.. can someone with a known-good copro confirm that's what they get too?

I'm a little confused as to what runs where - does BASIC data by default still 
get stored on the beeb side of things (which would explain why HIMEM is at 32K 
and not closer to 64K)? Or does the copro by default reserve half its memory 
for workspace / ROM space? The Advanced User Guide says that everything (apart 
from I/O) actually runs from the copro side though, including the default 
language - which in a way does a lot of the memory testing that I was asking 
about for me! :)

Oddly enough the Watford diags (which I've finally got copied on to a disk!) 
say that there's no copro present - not sure why that is (unless I need to 
somehow kick everything back to running on the beeb side before the code will 
let me test the copro - not sure how to do that yet)

cheers

Jules




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