Any CPU needs RAM and ROM. If you are building a retro computer using a processor like the 8-bit 6502, you could use a RAM chip and an EEPROM chip, or you could use a Raspberry Pi Pico to emulate RAM and ROM for you!

My Clock Module:    • I Built a Computer Clock Module for D...  

Ben Eater - Build a 6502-based computer from scratch:    • Build a 65c02-based computer from scr...  

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