[BBC-Micro] Tube questions
robert at irrelevant.com
Thu Jul 30 12:38:52 BST 2009
On 30/07/2009, Nick Balmer <corelki2 at hotmail.co.uk> wrote:
> Does anyone have a circuit diagram for the "TUBE"
Which side? Logically you could argue that the tube itself is just
the straight-through cable that links the two devices... Practically,
there's only a little more than that involved! The BBC side of the
Tube is minimal .. it's litle more than a connection to the bus and a
couple of address lines. This links to a custom ULA within the second
processor unit, and that is mostly a set of FIFO buffers for trickling
data between the two processors.
There's a circuit diagram and lots of useful information in the 6502
second processor service manual, on Chris's site:
You'll find the Model A&B circuit diagram in the same place.
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