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3. Floating Point format and Execution Units

Next I decided the format to use for floating point (none of this IEEE compliant nonsense). I use 1 sign bit, 8 exponent bits and a 31-bit fractional part. This I consider should be a reasonable accuracy for most applications, and of course it fits the 40-bit word size nicely.

I regroup the instructions and decide on what execution units I will need to build. Each unit will handle a particular type of instructions. The list of execution units doesn't seem complete.