[Simh] Ferranti Pegasus Simulator

[Leo Broukhis]

As a first step, you can try using https://gmplib.org/

Leo


On Sat, 11 Jun 2016 00:46:02 +0100, "Dave Wade" <dave.g4ugm at gmail.com>
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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