Re: The clock register

["Jan Poulsen" <jpoulsen2@tiscali.dk>]

"ict@ccess"  skrev i meddelelsen 
3981f728-4d9a-44b4-9838-d798c38fd136@h5g2000vbx.googlegroups.com">news:3981f728-4d9a-44b4-9838-d798c38fd136@h5g2000vbx.googlegroups.com...

Can anyone tell me what the high nybble at $C034 does?  All I know is
that it has something to do with the clock.  I am looking for the
breakdown of each bit.

Rob


Have a look at this volume 7, issue 4 of Apple Assembly Line

http://homepage.mac.com/bobsc/aal/1987/aal8701.html

$C033 = clock chip data register

$C034 = clock chip control register & border color
       bit 7 = 1 to strobe data into clock
             = 0 when data has been accepted
       bit 6 = 1 to read chip, =0 to write chip
       bit 5 = chip enable after transfer
       bits 3-0 = border color

Regards,
Jan