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Leo Brodie's classic book, now available under a Creative Commons license.
to books etext forth language-design programming rpn software-engineering ...
on 24 November 2014
Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35
Most impressive. I don't have one of these...
to calculator retrocomputing reverse-engineering rpn sinclair ...
on 03 September 2013
34s:start [HP Calculator Wiki]
Alternative firmware for current(-ish) HP calculators to reproduce the RPN experience.
to calculator firmware hp maths rpn ...
on 03 January 2013
by Adam Sampson.