Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!snorkelwacker!bloom-beacon!eru!luth!sunic!liuida!prodix!isadora!hacker
From: hacker@isadora.ikp.liu.se (Goran Larsson [Hacker of Hackefors])
Newsgroups: comp.sys.misc
Subject: Re: RPN Calculators
Message-ID: <529@isadora.ikp.liu.se>
Date: 15 Nov 89 16:40:43 GMT
References: <2148@leah.Albany.Edu> <2039@zen.co.uk> <1505@cipc1.Dayton.NCR.COM>
Sender: news@prodix.liu.se
Reply-To: hacker@isadora.ikp.liu.se
Organization: Hackers Home, Hackefors, Linkoping, Sweden
Lines: 19

In article <1505@cipc1.Dayton.NCR.COM> tbertels@cipc1.Dayton.NCR.COM (Tom Bertelson) writes:
>I have a National Semiconductor RPN calculator that I still
>occasionally use.  It's the only calculator I know that will float
>(with the battery removed).  5 cubed would equal, after about two
>second's thought, 124.9999999.  I think it was called the
>"Scientific".  Does anyone else remember this thing?

Yes! They had two versions: INFIX and RPN. The CPU was a weird one-bit
controller. You could buy the CPU and also two ROM chips with the code
for the two calculators. A special version of the CPU did not drive the
keyboard and display, it had a BCD port. It was supposed to be used as
a floating point chip! It was S-L-O-W....

  !       _
  ! !    Goran Larsson  [The Hacker of Hackefors]
--+-!    Hackefors, Linkoping, SWEDEN (See)  +46 13-155535 (Hear)
  !-+--  ...!uunet!sunic!liuida!prodix!isadora!hacker (UUCP)
  ! !    hacker@isadora.ikp.liu.se (Internet)
    !                                                    Mmh, Yes