![]() ![]() To reduce costs, some of the general purpose input/output capabilities of the AT controller was used to control various functions unrelated to the keyboard, including: The 8042 was a powerful micro-controller. The old PPI was not part of the motherboard any more. With the PC-AT, IBM introduced new keyboards (with a new bi-directional protocol) and a new keyboard controller (Intel 8042). The XT controller is 100% obsolete and won't be discussed further in this page. 6.7 Step 7: Determine If There Are 2 ChannelsĪ multi-purpose PPI (Intel 8048, Programmable peripheral interface also used to control other functions, like sound and parity error) controlled the original uni-directional, single channel IBM PC and PC-XT keyboard interface.6.6 Step 6: Perform Controller Self Test. ![]() 6.5 Step 5: Set the Controller Configuration Byte. ![]()
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