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82C55A June 1998 CMOS Programmable Peripheral Interface Description The Intersil 82C55A is a high performance CMOS version of the industry standard 8255A and is manufactured using a self-aligned silicon gate CMOS process (Scaled SAJI IV). It is a general purpose programmable I, O device which may be used with many different microprocessors. There are 24 I, O pins which may be individually programmed in 2 groups of 12 and used in 3 major modes of operation. The high performance and industry stan