DEC Radix-50 - 36-bit Systems

36-bit Systems

Radix-50 in 36-bit systems was commonly used in symbol tables for assemblers or compilers which supported 6-character symbol names. This left 4 bits to encode properties of the symbol.

Radix-50 was not normally used in 36-bit systems for encoding ordinary character strings; file names were normally encoded as six six-bit characters and full ASCII strings as five 7-bit characters and 1 unused bit per 36-bit word.

PDP-6, PDP-10/DECsystem-10, DECSYSTEM-20
Most
significant
bits
Least significant bits
000 001 010 011 100 101 110 111
000 space 0 1 2 3 4 5 6
001 7 8 9 A B C D E
010 F G H I J K L M
011 N O P Q R S T U
100 V W X Y Z . $ %

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