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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