As a first step, you can try using https://gmplib.org/
Leo On Sat, 11 Jun 2016 00:46:02 +0100, "Dave Wade" <[email protected]> wrote: > Whilst its not a SIMH simulator, I hope you can help. I want to write an > emulator for the Pegasus. The Ferranti Pegasus was (there are none > operating > at present) a strange beast with two 18-bit instructions per 39-bit word. > Generally, it does 39-bit twos complement arithmetic. The multiply results > in a 77-bit result which I have no problems implementing. > > Where I am struggling is with the divide. I need to be able to divide a > 77-bit number by a 39-bit number and get a 39 bit quotient and a 39 bit > remainder. As the compiler I am using only does 64-bit numbers this is > proving challenging. Any one got a good article on how to do this? > > Dave Wade > G4UGM >
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