>> Is it possible to re-wire one of those 5 minute voice recorders to record
>> signal sent from a graphlink and then re-play it if your calc freezes?
>No (not trivialy anyway). The transmission protocol
>requires more smarts than just a recorded playback
>>The purpose of such a device would be to get all of the
>> programs that you sent back.
>What you are after is an expander, check the list
>archives or do a web search for TI and Expander.
>They have been produced, but are fairly rare.
I have 5 rom chips and matching memory.