Linked by Thom Holwerda on Wed 3rd Apr 2013 21:45 UTC
Apple "Thanks to 35-year-old documents that have recently surfaced after three-plus decades in storage, we now know exactly how Apple navigated around that obstacle to create the company's first disk operating system. In more than a literal sense, it is also the untold story of how Apple booted up. From contracts - signed by both Wozniak and Jobs - to design specs to page after page of schematics and code, CNET had a chance to examine this document trove, housed at the DigiBarn computer museum in California's Santa Cruz Mountains, which shed important new light on those formative years at Apple."
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Not me
by TempleOS on Thu 4th Apr 2013 16:37 UTC
TempleOS
Member since:
2013-04-03

The Apple and C64 had trig functions, or at least the C64 did. Taylor is slow to converge, so I've heard. I'm sure there was a standard way to do trig by 1975. The C64 ROM was 20K for everything! Interpolation and a table can't be right, but I don't know.

Just doing floating-point MUL and DIV on a 6502 is pretty damn hard, or at least tedious. You have ADD, SUB, AND, OR, NOT SHIFT's and BRANCHes on 8-bits. You have no idea! Integer MUL and DIV take about 12 instructions.

For everybody who does not know the joys of MUL and DIV without CPU instructions, have a look:

http://www.templeos.org/Wb/Demo/Asm/DivByHand.html

http://www.templeos.org/Wb/Demo/Asm/MulByHand.html

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