[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.

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