HP-29C Neutral Operations

[teenix]

In the 19C there are a few 1 -> s9 instructions

$02D
$031
$038
$F05
$FAB

I remodeled the 19C code and it now does as the owner's manual says, "but" because the code was designed as a lattice work to make the best use of the ROM space available, some parts of the code may intercept in the middle of other code snippets, so it is hard to predict if any changes produce hidden errors.

cheers

Tony