Question

Can we have computer without an ALU? if no why?​

Answer 1

Answer:

Depends on how you define a computer.

I once worked on an embedded micro controller inside a modem. Gate count was very tight (this was back in the early 1990s). The software and hardware were developed together. We had 720 bytes of memory to play with and the instruction set was pared back to only the instructions we really needed.

For most if the development this processor had MOV / AND / OR / SHIFT instructions but no ADD / SUB. It did have a DEC though for loop counters. And there was an incrementer for the program counter, but that wasn't exposed in the instruction set.

Late on in the development we discovered we needed an ADD for part of the power on sequence so we added that instruction- so by the time we went to silicon it had an add but no SUB

Answer 2

Answer:

cumputer is a mashion an he is not