Difference between the 8255 and 8042 PPIs - Retrocomputing …
https://retrocomputing.stackexchange.com/questions/26396/difference-between-the-8255-and-8042-ppis
WebFeb 8, 2023 · Port B of 8255 is used for output to control various stuff, most common people know is controlling the PC speaker. Port C is used as status input, such as for reading motherboard DIP switches. The 8255 PPI lives in 8088 IO addresses 60h to 63h. The 8042 is also "just" chip that sits on the 80286 CPU bus on a PC AT.
DA: 85 PA: 60 MOZ Rank: 17