IBM-PC/XT asynchronous communications adapter with INS8250 serial communication chips, she constitutes a standard RS-232C communication interface, the core voltage components, together with RS-TTL level conversion chip SN75150 (TTL-RS-232) or MC1488 and SN75154 (RS232-TTL) or MC1489 to achieve INS8250 UART TTL level and RS232 level conversion between.

DATA SEGMENT.doc

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