Thread: hp-41cx / NoV-64d / Hepax XF multi-function

[kj.vandelooij]

(09-04-2023 03:02 PM)rprosperi Wrote:  Using these HEPAX functions to see what the module thinks is in HEPRAM:

[XEQ] "HEPDIR" List of files in HEPRAM
[XEQ] "BCAT" List ROM Pages (3-F) to see how HEPAX is seeing what is in each page.

It sounds like it is not actually cleared, but these results may help you to understand what's going on.

Thanks Bob,

I got the following results:

HEPDIR
H:DIR EMPTY

HEPAX 002
3: -ext fnc 2d
4: no rom
5: -time 2c
6: -hepax 1d
7: no rom
8: hepax ram
9: @@@@@@@
A: hepax ram
B: hepax ram
C: no rom
D: no rom
E: no rom
F: no rom

Page 9 is not what it should be and indeed suggests that the memory has not been cleared. After this block dir I applied the CRF method:
1. enter + on: does not work.
2. <- + on: does work.

HEPAX 002
3: -ext fnc 2d
4: no rom
5: -time 2c
6: no rom
7: no rom
8: no rom
9: no rom
A: no rom
B: no rom
C: -hepax 1d
D: no rom
E: no rom
F: no rom

I would expect 'hepax ram' in 8 - B, but clearing hasn't happened yet, so this might be normal.

Next, still following the procedure, for each chip, I cleared the pages:
000 -> 4100
OK -> alpha
8 -> X
CLRAM
9 -> X
CLRAM
10 -> X
CLRAM
11 ->
CLRAM
and the same for 001 -> 4100, 002 -> 4100, 003 -> 4100

After a power cycle, this resulted in:
3: -ext fnc 2d
4: no rom
5: -time 2c
6: -hepax 1d
7: no rom
8: hepax ram
9: hepax ram
A: hepax ram
B: hepax ram
C: no rom
D: no rom
E: no rom
F: no rom
for each of the four chips. While this result looks promising, keying in the test program and running it, like before, still results in:
1. nonexistent
2. 9:@@@@@ in the block dir

In my mind there are three possibilities:
1. I interpreted the procedure for clearing incorrectly.
2. Something is broken.
3. The XF functionality does not work in a HP-41 CX.

I hope somebody can confirm one of these possibilities, or can come up with a completely new one.

Thanks again,

Kees Jan