Date   : Sat, 29 Nov 2003 12:40:23 +0000 (GMT)
From   : BBC Micro <b_b_c_m_i_c_r_o@...>
Subject: Puzzling out the OSBYTE 121 and f0cc

Hi there,

Still puzzling through the code at f0cc. I know the
OSBYTE 121 will return the negative key value if it is
currently pressed but I can't tie up the description
with the code walkthrough. 

  I can see that it is cheking the keyboard interrupts
to see if the key is currently pressed but I can't see
where a successful match is falling out the loop...

  What is at (01DF) as (02DF) is the keyboard hold?

  "X determines the key to be detected and also
determines the range of keys to be scanned" I'm not
entirely sure about the "also" part...

The loop points are f0e3 and f103 but I can't make out
what they are doing...

http://whitebody.tripod.com/f0cc.html

Cheers,

M

________________________________________________________________________
Download Yahoo! Messenger now for a chance to win Live At Knebworth DVDs
http://www.yahoo.co.uk/robbiewilliams