8-bit computing: Difference between revisions

Revision as of 13:22, 16 July 2024

Revision as of 08:25, 13 August 2024

Line 30:

While in general 8-bit CPUs have 16-bit addressing, in some architectures you have both, such as in the [[MOS Technology]] [[MOS Technology 6502|6502]] CPU, where the [[zero page]] is used extensively, saving one byte in the instructions accessing that page, and also having 16-bit addressing instructions that take 2 bytes for the address plus 1 for the opcode.

Some [[index register]]s are 8-bit, such as the two in the 6502, are 8-bit. This limits the size of the arrays addressed using [[indexed addressing]] instructions to objects of up to 256 bytes without requiring more complicated code. Other 8-bit CPUs, such as the [[Motorola 6800]] and [[Intel 8080]], have 16-bit index registers.

== Notable 8-bit CPUs ==