A 1-bit computer architecture is an instruction set architecture for a processor that has datapath widths and data register widths of 1 bit (1/8 octet) wide.
An example of a 1-bit architecture that was actually marketed as a CPU is the Motorola MC14500B Industrial Control Unit.[1] There are also several design studies for 1-bit architectures in academia, and corresponding 1-bit logic can also be found in programming.
Most calculators used a bit serial design before using 4-bit and later up to 32-bit processors.
Other examples of 1-bit architectures are programmable logic controllers.
A typical sequence of instructions from a program for a 1-bit architecture might be:
- load digital input 1 into a 1-bit register;
- OR the value in the 1-bit register with input 2, leaving the result in the register;
- write the value in the 1-bit register to output 1.
1-bit CPUs can be considered obsolete now, not many kinds have been produced (MC14500B and WDR-1 known) and none known to be available in the major computer component stores (as of 2014[update], a few on eBay[2]). Finnish company Partco still sells MC14500B [compatible] as spare part in 2016.[3]
See also
References
- ^ "MC14500B Industrial Control Unit. Semiconductor Technical Data, Rev. 3" (PDF). Motorola. 1995. Retrieved August 1, 2012.
- ^ http://www.ebay.com/itm/Motorola-IC-MC14500B-MC14500BCL-100-NEW-/320837692605
- ^ "CMOS-LOGIC IC 4500 DIP16".
Also known as MC14500BCP
External links
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