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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== | ||