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 Post subject: The Sinclair scientific calculator reverse engineered
PostPosted: Tue Sep 03, 2013 4:35 am 
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Joined: Sun Mar 15, 2009 12:00 am
Location: Jarrow, England
A Google employee named Ken Shirriff has managed to reverse engineer the code used to create the 1974 Sinclair Scientific Calculator. This calculator used a Texas Instruments 4 bit micro chip which originally did only + – ÷ ×. What Sinclair employee Nigel Searle did was to add trig and log functions using a ROM which could hold only 320 instructions, had 3 storage registers, no subroutine calls and no storage for constants like pi.

You can read the article here.

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