Jim Phoenix wrote:

Try calculating a relative branch manually for a zap. Don't forget to miscalculate or fat finger keying it in! ;-)


I've seen plenty of mistakes made zapping based branches as well.

Mistakes made while "hand assembling" instructions notwithstanding, my point was that a properly assembled relative branch will never be "wild". OTOH, a based branch -- even one that is assembled 100% correctly -- is dependent on the contents of its base register being correct at run time. If the base register becomes corrupted, all bets are off!

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