What is the alternativwe needs in 82c55 if it is not available?

If the 82C55 programmable peripheral interface is not available, alternative options include using other programmable I/O chips like the 8255 PPI or microcontrollers with built-in I/O capabilities, such as those from the PIC or AVR families. Additionally, using GPIO (General Purpose Input/Output) pins on a microcontroller can fulfill similar functions, allowing for flexible control of peripherals. In some cases, FPGA (Field-Programmable Gate Array) solutions may be used to replicate the functionality of the 82C55.