Computer engineering

Vacuum tube mainframe open for a history lesson, one should go right here.
DEC Digital Equipment Corporation.
8 bit microcontroller see also: Fairchild F8, RCA 1802, Motorola 6809, MOS 6502, Zilog Z80, Intel 8088
x86 including the NEC v20, see ["], 80286, 386, 486, Pentium, PPro
Motorola see also [ColdFire] which is the last standing m68k chip.  see also [AAPL] for Mac hardware
AMD American Micro Devices.
Intel see also [IBM] for PC hardware.
ARM you might have a cell with that in it.  probably "secured by knox."  Xiaomi, AAPL, Samsung, Huawei, Puri.sm, GOOG, ZTE, and Motorola make them.
RISCv the first open architecture, highly academic, first produced at UCB.
IBM POWER as used by [1] and you can ask me for a built copy.