48G Destructive Teardown - EEVblog

[Paul Berger (Canada)]

(05-23-2017 01:52 AM)Han Wrote:  The other oddity about that calculator was the jumper between ROM and RAM chip. The calculator presumably got upgraded to 128KB, but such an upgrade never required anything more than a RAM chip replacement.

That jumper is on one of the address lines which would suggest a broken land on the board probably from removal of the original chip, but I think a shorter wire could have been used.

Paul.