Re: The clock register

["ict@ccess" <gids.rs@sasktel.net>]

On Mar 23, 8:44 am, "Jan Poulsen" <jpouls...@tiscali.dk> wrote:
> "ict@ccess"  skrev i meddelelsen3981f728-4d9a-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

Thanks Jan