Editing Binary-coded decimal (section)

==Notes==
{{reflist|group="nb"|refs=
<ref group="nb" name="Pseudo-tetrades">In a standard packed 4-bit representation, there are 16 states (four bits for each digit) with 10 [[tetrade (computing)|tetrade]]s and 6 [[pseudo-tetrade]]s, whereas in more densely packed schemes such as [[Hertz encoding|Hertz]], [[Chen–Ho encoding|Chen–Ho]] or [[densely packed decimal|DPD]] encodings there are fewer—e.g., only 24 [[unused state (logic)|unused state]]s in 1024 states (10 bits for three digits).</ref>
<ref group="nb" name="Packed_chars">In a similar fashion, multiple characters were often packed into machine [[word (computer architecture)|word]]s on [[minicomputer]]s, see [[SQUOZE#Identifier name character encoding|IBM SQUOZE]] and [[DEC RADIX 50]].</ref>
<ref group="nb" name="Non-BCD">Code states (shown in black) outside the decimal range 0–9 indicate additional states of the non-BCD variant of the code. In the BCD code variant discussed here, they are pseudo-tetrades.</ref>
<ref group="nb" name="Unsymmetrical_2421">The Jump-at-8 code is also known as unsymmetrical 2&thinsp;4&thinsp;2&thinsp;1 code.<!-- <ref name="Borucki-Dittmann_1971"/> --></ref>
<ref group="nb" name="Petherick_RAE">The [[Petherick code]] is also known as [[Royal Aircraft Establishment]] (RAE) code.</ref>
<ref group="nb" name="Aiken_2421">The [[Aiken code]] is one of several 2&thinsp;4&thinsp;2&thinsp;1 codes. It is also known as 2*&thinsp;4&thinsp;2&thinsp;1 code.</ref>
<ref group="nb" name="O'Brien-I_WRD">The [[O'Brien code type I]] is also known as [[Hilger & Watts|Watts]] code or Watts reflected decimal (WRD) code.</ref>
<ref group="nb" name="Gray_Stibitz">The [[Excess-3 Gray code]] is also known as [[Frank Gray (researcher)|Gray]]–[[George Robert Stibitz|Stibitz]] code.</ref>
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