11301: Difference between revisions

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The RS-232 interface of the 11301 is implemented using an 8251A UART chip,
The RS-232 interface of the 11301 is implemented using an 8251A UART chip,
interfaced using an MC1488 line drive and an MC1489 line receiver.
interfaced using an MC1488 line drive and an MC1489 line receiver.
The mainframe communicates with the plug-ins via the Serial Data Interface (SDI).
This comprises three signals:
* SDI clock
* SDI mainframe to plug-in
* SDI plug-in to mainframe
On the mainframe side, this communication is controlled by the U1760 SDI chip on the A11 Main Processor board
(the top rear board).
==Pictures==
==Pictures==


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