(71b) Math-Rom advanced

[Erwin]

Hallo!

Yesterday I found an old forum task about an advanced Math-Rom: 50g/48GX vs. 71B matrix operations--getting slightly different results

Some times ago I bought a EPROM which included the Math-Rom and the JPC-ROM (E1) - that seems to be the version of Rodger Rosenbaum - I checked it with the changed "ARR" to "PERM"-LEX. No idea what the "1" is in "E1".
Although for the MATH-ROM I get the "MATH:1A" it seems to be the "X-ROM-version" described in the old forum thread (Rodger Rosenbaum?).

With the "test-prog"

Code:

10 OPTION BASE 1 @ DIM C(5) @ COMPLEX R(4)
20 READ C
30 MAT R=PROOT(C)
40 MAT DISP R;
100 DATA 1,4,6,4,1

I get the results

Code:

(-1,0)
 (-1,0)
 (-1,0)
 (-1,0)

Is there another way to check the differences and what differences are in this MATH-EPROM? The thread stopped 2007 without new information.

best regards
Erwin