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The Case for 9-bit Bytes: A Historical Perspective on Computing Standards

By

luu

9mo ago· 6 min readenInsight

Summary

The article discusses the historical use of 9-bit bytes in 70s computing systems like the PDP-10 and contrasts it with the modern standard of 8-bit bytes, largely influenced by the System/360. It argues that 9-bit bytes could have had advantages, particularly in contexts like IPv4 addressing, and reflects on the historical coincidences that shaped current standards.

Key quotes

· 3 pulled
A number of 70s computing systems had nine-bit bytes, most prominently the PDP-10, but today all systems use 8-bit bytes and that now seems natural.
As a power of two, eight is definitely nicer. But I think a series of historical coincidences would actually go our way with 9-bit bytes.
IPv4 had 32-bit addresses, so about 4 billion total.
Snippet from the RSS feed
A number of 70s computing systems had nine-bit bytes, most prominently the PDP-10, but today11 Apparently, it was the System/360 that really set the standard here. all systems use 8-bit bytes and that now seems natural.22 Though you still see RFCs use "oc

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