DM 41l bug? User Keyboard does not work as expected

[Eddie W. Shore]

I am trying to set up a solver like the HP 12C solver on the Swiss Micros DM 41L. The equation I am using is:

a^2 + b = log c

where a is stored in Register 1, b is stored in Register 2, and c is stored in Register 3

My test data is:
XEQ DEMO

2.5 [ B ]
500 [ C ]
[ A ] 0.44606

1200 [ C ]
0.75 [ A ]
[ B ] 2.51668

.48 [ A ]
.33 [ B ]
[ C ] 3.63413

Demo - HP41C

Code:


01 LBL T^DEMO
02 SF 27    // turn on user mode
03 RTN

04 LBL A
05 FS? 22   // flag 22 set: in number enter mode
06 STO 01
07 FC? 22
08 GTO 01
09 CF 22
10 RTN
11 LBL 01  // calculate for a
12 RCL 03
13 LOG
14 RCL 02
15 -
16 SQRT
17 STO 01
18 RTN

19 LBL B
20 FS? 22
21 STO 02
22 FC? 22
23 GTO 02
24 CF 22
25 RTN
26 LBL 02
27 RCL 03
28 LOG
29 RCL 01
30 X↑2
31 -
32 STO 02
33 RTN

34 LBL C
35 FS? 22
36 STO 03
37 FC? 22
38 GTO 03
39 CF 22
40 RTN
41 LBL 03
42 RCL 01
43 X↑2
44 RCL 02
45 +
46 10↑X
47 STO 03
48 RTN

In user mode, what I get is:
[ A ] leads to XEQ A
[ B ] leads to XEQ B
[ C ] leads to PSE

The [ C ] doesn't appear to work as intended. So I can't store values by pressing [ C ] nor solve.

I don't know if this is a bug.

Any thoughts? Thank you in advance.