I-Box guts

[Controls Guy]

Is there a reference for what native instructions all the IBoxes compile to?

[b_carlton]

Create a program with, for simplicity, one rung with the IBox you are interested in. Then perform an export to a text file choosing "Expand IBoxes" in the options area.

[Controls Guy]

Thanks.  I'm trying to do things like understand what to expect to find in the accumulator after IBox execution.

[franji1]

Thanks.  I'm trying to do things like understand what to expect to find in the accumulator after IBox execution.

I know that when you do MATHBIN and MATHBCD, if the result could be bigger than 16 bits, the result is still in the 32-bit accumulator.  So if it's possible that your calculation may be bigger than 9999BCD or 65535binary, just do an OUTD immediately after the MATHBIN/MATHBCD IBox.

LD K5001
OUT V1400
OUT V1401
MATHBCD V2000 "V1400 + V1401"
OUTD V2001

V2000 would equal 2 BCD, but V2001 as a DOUBLE BCD would equal 10002