Gary wrote:
> Don't know about SPMs but is it any easier to code the equivalent "If A 
> or (D and (B or C))"?
   No, that's why I mentioned the order. 'D' uses the register loaded from 'B' 
to address a control block. But if it loaded a negative value, then 'C' 
complements it and if it's 0, then exits. So the ('B' or 'C') has to happen 
before the ICM and test at 'D'.                                        

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