[BBC-Micro] 8MHz and 2MHz clocks on BBC Model B

Mike Tomlinson mike at jasper.org.uk
Mon Oct 18 08:37:38 BST 2010

In article <AANLkTimOfRC4iKUg7Qfqa2dvtXOq2F2QobjKtt-
j84Z3 at mail.gmail.com>, James McGill <plexer at gmail.com> writes
>Hi all,
>I'm trying to determine what the purpose of IC30 (74LS74) on the Model
>B is. My best guess is that it should delay the 2MHz clock by 1/2 a
>cycle (250nS),

I've only glanced at the diagram, but my first thought is that it has
something to do with slowing the system clocks down for 1MHz bus access.


More information about the bbc-micro mailing list