Topic summary
8-bit
Extracted from the Wikipedia article 8-bit computing.
Details
8-bit CPUs use an 8-bitdata bus and can therefore access 8 bits of data in a single machine instruction. The address bus is typically a double octet (16 bits) wide, due to practical and economic considerations. This implies a direct address space of 64 KB (65,536 bytes) on most 8-bit processors.