SandMath incomplete beta function broken?

[quantalume]

When trying to evaluate incomplete beta (ICBT) on the two versions of SandMath I'm using (SM9F and SM9G), the calculator just displays "RUNNING..." for a long time and never converges on an answer. ICBT is a FOCAL program, so I decided to have a look at it. It has an inauspicious beginning...

Code:

01 ST* 01
02 STO 00
03 STO 00
...

...and continues on for some 66 lines, eventually attempting to find the answer via the generalized hypergeometric function, HGF+. I tried calculating incomplete beta manually using SandMath's HGF+ function, and I get the right answer, with HGF+ converging reasonably quickly.

I don't have room in my NoV64 for the 32K monster that the latest SandMath has become, so I was wondering if someone with a 41CL could see if the function has been fixed. You can use the example from the manual:

Code:

PI
1
E^X
0.7
XEQ “ICBT“

->0.029623046

Thanks.