Re: Cassette Sense on Plus/4

From: Rob Clarke <*crock_at_clarke-family.org.uk*> Date: Thu, 26 Jan 2012 10:19:27 +0100 Message-ID: <0c018f4e4006b5d48ae4571a87724a4c.squirrel@www.clarke-family.org.uk> · crock_at_clarke-family.org.uk

From memory, those jumpers control which data line is used as 'select for
the two joystick ports. Quite why this was only on the C16 board is
equally baffling.

rob

> On 01/25/2012 03:47 PM, Rob Clarke wrote:
>
> The question is, what was the sequence in the 264 development? I think
> the C16 was the last one. I wouldn't surprise me if the layout of the +4
> board was done while the change to the PLA and extra logic was
> relatively recent and they wanted to keep their options open.
>
> BTW: The C16 board also has 2 unexplained jumper blocks on the board
> next to U11 (74LS125) labeled D1 and D2. They are not mentioned in the
> schematics. Anyone have an idea what they are for?
>
>   Gerrit
>
>
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>

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