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Hi!

The following sequence of keys should be able to demonstrate the ability of a HP 41C to be programmed.
It is the case on my 41 CVs, but not on the 41C, I would like to know what is going wrong here.

Keys ----> Display

ON+CLX ---> MEMORY LOST

PRGM ----> 00 REG 46

GTO .. ----> 00 REG 46

LBL alpha AAA alpha ----> 01 ASHF

SIN ---> ROM

R/S ---> ROM

PRGM --> 0.0000

PRGM ----> 01 ASHF

SST ----> PRIVATE

BST ----> PRIVATE

GTO .. ----> 00 REG 12

LBL alpha BBB alpha ----> 01 ASHF

COS ---> ROM

R/S ---> ROM

PRGM --> 0.0000

PRGM ----> 01 ASHF

SST ----> PRIVATE

BST ----> PRIVATE

GTO .. ----> 00 REG 12

And so on, I can't enter any program....

Any comments, gents (or ladies) ?


gilles

My guess is that something is wrong with the built in ROM, try a service module and see what it says.

Hi;

I second Håkan´s conclusion. One of the main interests I had when using MLDL2000 to emulate the HP41 system ROM´s functionality was not only to locate the faulty ROM but also to test the remaining calculator if there is none to replace it.

In this case, the only way to repair would be taking a good ROM from a donator, though.

Success!

Luiz (Brazil)

I was thinking of a faulty RAM. Can you check what happens if you store various numbers in a register?

Quote:
My guess is that something is wrong with the built in ROM, try a service module and see what it says.

Sorry, but can you tell me what a service module is and how to operate?

The service module was not officially sold, but it can pop up on ebay.

An alternative way is to obtain the ROM image and download it to suitable reprogrammable module (hardware), such as an MLDL or a Clonix module.