I am confused between ISA (Industry standard architecture) and ISA (Instruction set architecture) -

one of these called bus standard book on industry standard architecture talks about:

bus cycles, addressing, i/o, ram, rom, , cache memory, cache architectures, decode , reset logic, interrupts, system kernel, bus mastering, dma, rtc , configuration ram,

and instruction set architecture defines type of instructions processor has.

what relationship between two? totally confused.

these different acronyms.

isa in instruction set architecture refers instructions processor can execute. in old days, each computer had own instruction set , had programmed differently. in 1964 ibm introduced ibm system/360, family of computers shared same isa. allowed ibm sell big , small machines , use same software on of them. mayor breakthrough. idea adopted competitors. today, common isas example intel x86, arm , powerpc. because use same isa, can use same software processors intel or amd in windows pc.

isa in industry standard architecture refers bus architecture, i.e. physical connector, electrical signals , protocols. isa bus part of original ibm pc 1981. bus used add hardware pc graphics cards, parallel , serial i/o interfaces, , hard disk controllers. because isa open standard thir parties produce , sell extension cards plugged ibm pc. isa bus used other computers amiga 3000 , bebox. means plug isa card these computers , use it.