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"poorly suited" in the manual is a bit of an understatement, the 1-bit ICU wasn't always used alone. Doesn't mean such chips were purely 1-bit. I fixed some seemingly OCR errors while copying from the manual, e.g. MC14500B with 8 instead of B, and "requíre". |
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There are no computers, [[microcontroller]]s of any kind, such as [[programmable logic controller]]s that are exclusively 1-bit for all registers and [[address bus]]es. A 1-bit register can only store 2<sup>1</sup> different values, i.e. 0 or 1, or they can mean e.g. on and off. This is very restrictive, e.g. not enough for a [[program counter]] (which is on modern systems implemented in an on-chip register), that isn't implemented on-chip in some 1-bit systems. [[Opcode]]s for an 1-bit systems were, at least for one architecture, 4-bit and the address bus 8-bit.
While 1-bit CPUs are obsolete, the first [[carbon nanotube computer]] is a 1-bit [[one-instruction set computer]] (and has only 178 transistors).
==1-bit==
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