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Subject: Re: Need assistance
From: William Ray Wing <wrw@mac.com>
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Date: Sat, 18 Jul 2015 14:28:05 -0400
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To: Mark Lawrence <breamoreboy@yahoo.co.uk>
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> On Jul 18, 2015, at 1:34 PM, Mark Lawrence <breamoreboy@yahoo.co.uk> =
wrote:
>=20
>=20

[byte]

> What is an {HP calculator} roll operation?
>=20

The original Hewlett Packard =E2=80=9CScientific=E2=80=9D calculators =
(HP-35, 45, 65, etc) that used Polish notation (operand, operand, =
operation; with no =E2=80=9C=3D=E2=80=9C sign) had a stack.  That stack =
itself could be manipulated (e.g., interchange X and Y). One of the =
stack manipulation commands was =E2=80=9CRoll=E2=80=9D which moved the =
top entry into X and pushed remaining elements up one.  Later versions =
had both Roll-up and Roll-down, Roll-down moved the X entry to the top =
of the stack and dropped the other elements.

Bill  (Who still uses an HP-45 emulator on his iPhone)

> --=20
> My fellow Pythonistas, ask not what our language can do for you, ask
> what you can do for our language.
>=20
> Mark Lawrence
>=20
> --=20
> https://mail.python.org/mailman/listinfo/python-list