Re: Why I've Dropped In

On Thu, 22 May 2025 18:03:34 +0000, Scott Lurndal wrote:

mitchalsup@aol.com (MitchAlsup1) writes:

On Thu, 22 May 2025 6:51:05 +0000, David Chmelik wrote:
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>

What is Concertina 2?

>
Roughly speaking, it is a design where most of the non-power of 2
data types are being supported {36-bits, 48-bits, 60-bits} along
with the standard power of 2 lengths {8, 16, 32, 64}.

>
Both sets are congruent to zero modulo 4.

Restricted because it does not support 28-bits, 40-bits, 44-bits,...

                                          Therefore, the
only proper solution becomes that modulo value, which amounts
in this case to a 4-bit digit/nibble.    Any size data type can
be constructed from a variable number of nibbles up
to some architectural max (e.g. 400 bits for a 100 nibble
operand).   The processor can treat them as binary or BCD
depending on the requirements of the application (e.g. BCD
fits COBOL well).