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OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Printable Version

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OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Egan Ford - 08-30-2013

http://files.righto.com/calculator/sinclair_scientific_simulator.html


Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Steve Simpkin - 08-30-2013

Amazing, fascinating, unbelievable and disturbing all in one product!


Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Matt Agajanian - 08-30-2013

I'll second that vote! Although, I must say the math genius who devised his even more inventive algorithms is certainly a very amazing mathenatician!


Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Thomas Klemm - 08-30-2013

I was hoping this would happen.

For those interested here's the Operating Instructions from Katie's manual collection for pre-LCD electronic calculators.

That's where you can also find the Assembly Instructions.

Kind regards

Thomas

PS: I like Milo.




Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Steve Simpkin - 08-30-2013

I vividly remember really wanting a Sinclair LED Black Watch when it first appeared around 1975. Given its high failure rate, I guess it is good I didn't get one. I did buy and build a Sinclair Wrist Calculator kit around 1977. It was hard to build but it did work, even if it had mechanical problems.

http://www.vintagecalculators.com/html/wrist_calculator.html

I also remember being intrigued (because of its low cost) by the Sinclair ZX80 computer when it came out but I already had a much more capable Ohio Scientific C1P by then. Memories....


Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Katie Wasserman - 08-31-2013

If Milo was still around I'm sure he'd say something like, "Woof!" (which roughly translates into I like you too).




Re: OT: Reversing Sinclair's amazing 1974 calculator hack - half the ROM of the HP-35 - Thomas Klemm - 09-02-2013

Inspired by the Sinclair Scientific I came up with this program for the WP-34s to calculate the logarithm:

LBL'LOG'
0
x<> Y
LBL 00
ENTER
SDR 002
-
INC Y
x>1?
GTO 00
DEC X
SDL 002
+
RCL/ 00
RTN
You have to initialize the register 00:
1
STO 00
XEQ'LOG'
STO 00
Afterwards you can use it:
SCI 4
5
XEQ'LOG'

6.9897 -1

I'm amazed by the accuracy of the results.

Cheers

Thomas

Edited: 2 Sept 2013, 11:21 p.m.