8-bit computing: Difference between revisions

Revision as of 13:51, 15 July 2024

Revision as of 05:01, 16 July 2024

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{{Further|Zero page}}

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. Commonly

Some [[index register]]s are 8-bit (while other "8-bit" CPUs, such as [[Motorolathe 6800]]two had 16-bit index registers), such asin the 6502. CPU, andThis thenlimits the size of the arrays addressed using [[indexed addressing]] instructions areto atobjects mostof up to 256 bytes, without needingrequiring longermore complicated code, i.e. meaningOther 8-bit addressingCPUs, tosuch eachas individual[[Motorola 6800]] and [[Intel array8080]], have 16-bit index registers.

== Notable 8-bit CPUs ==