Re: [stella] 7800 development

[Keith Gerdes <kwg@xxxxxxxxxxxx>]

Okay, here are the preliminary formulas:

get Csum from MungeCart()

Cartsum = ( ((Csum/P)^PEXP * AP)/N + ((Csum/Q)^QEXP * AQ)/N ) mod N

if ( (Cartsum^2)/N == Csum )
{
// copy Cartsum to $FF80-$FFF7
}


There may be some missing shifts since some values occupy indexone [1].
 e.g. byte acc[120];
      copy 119 byte value to acc[1]
      acc[0] = 0;


For "bignums", we have the following covered:
 multiply
 divide
 add
We need:
 mod (simplmod)
 power

I'll start with miracl and see if I can get something working...

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