NOS 6821 PIA

Z80B CPU

NOS Part LH0080B

6Mhz 40 Pin DIP Package

68B21 PIA  

Used refurbished and tested pulls (misc mfg)
40 Pin Dip Package  

Rockwell R6502A
8-Bit Microprocessor CPU  

Used on many arcade boards. 
40 Pin DIP Package 

Very hard to find NOS part, while supply lasts.

MC68B09EP

8-Bit Microprocessing Unit

40 Pin DIP Package

Refurbished used pulls, may show cosmetic blemishes.

D8049HC

8-Bit Microcontroller - Microcomputer

40 Pin DIP Package

These will sub the 8035 on Donkey Kong.

Subs M58715 used on Mario Brothers pcb with minor modifications (requires a patched rom and tie pin 7 high)

VP1000

Digital Voice Processor

40 Pin DIP Package

INS8039N-6

8-Bit MPU

Subs M58715 used on Mario Brothers pcb with minor modifications (requires a patched rom and tie pin 7 of the 8039 high)  Use the download link below to download the patched Mario Bros sound rom file.

40 Pin DIP Package

Z80 DMA

PN Z8410B1

Direct Memory Access Controller

40 Pin DIP Package

Used on some Nintendo boards