Hp-41C card reader - dead

[teenix]

Hi all,

This seems to be a common problem, although I don't know how common.

It may not be the card reader or sense chip, it could be the CRC or ROM chip at fault. The only way to test is to monitor the Is and DATA busses to see if the card data is being transferred to the 41.

I plan to do this soon with a faulty one I have here.

This testing might also reveal poor Port connections between the reader and 41.

cheers

Tony