HP-48GX RAM Card Problem

[knife31]

Saw this thread from 2006
I have been using my 128K card merged for years and it worked fine. I wonder if it got corrupted as per this thread.

>>Re: Ram card on HP48GX
Message #10 Posted by Han on 22 Mar 2006, 7:30 p.m.,
in response to message #1 by sarkiss

In order to expand user memory on an HP48GX, you must use the MERGE1 command with a 128KB RAM card in card slot one. This "merges" the memory in the RAM card with the default 128KB user memory.

I do not recommend using a 512KB RAM card in slot one. While the HP may see one of the banks on the 512KB RAM card, it is not clear that it is always the same bank. In fact, there are various pins in card slot one which correspond to the LCD signals. If these are read as input for the 512KB RAM chip, you may end up corrupting the data on your RAM card. Also, if you merge memory with a 512KB RAM card in slot one, the HP may use the wrong bank the next time you turn on the calculator or re-insert the card.

I recommend re-reading your user's manual and try to abide by the rules set out by HP regarding card slots.

Best of luck, Han>>