⭐ Merited by Heisenberg_Hunter (1)
Man... I miss my old Palm devices... had a couple back in the early 2000s, had a camera attachment for one as I recall... ran my entire life on Palms for a couple of years 
... they were awesome, but it was a pain carrying Two devices (PDA + Phone)... then I got my first smart phone (a Sony Ericsson P900) and never looked back 
Theoretically it should be possible to create a wallet on PalmOS... the difficulties will be:
1. Whether or not any of the required algorithms/libraries have been created for PalmOS or whether you will need to implement these yourself (ie. ECDSA, AES256, RIPEMD160 etc)
2. Getting hold of the hardware to test with
3. The hardware still being usable (as I recall they didn't have great battery life when "fresh", nevermind 20 years later)
For the software development, google is probably going to be your friend in this instance... I'm sure there will still be repositories of PalmOS development guides floating about.
For the hardware, maybe ebay?
... they were awesome, but it was a pain carrying Two devices (PDA + Phone)... then I got my first smart phone (a Sony Ericsson P900) and never looked back Theoretically it should be possible to create a wallet on PalmOS... the difficulties will be:
1. Whether or not any of the required algorithms/libraries have been created for PalmOS or whether you will need to implement these yourself (ie. ECDSA, AES256, RIPEMD160 etc)
2. Getting hold of the hardware to test with
3. The hardware still being usable (as I recall they didn't have great battery life when "fresh", nevermind 20 years later
)For the software development, google is probably going to be your friend in this instance... I'm sure there will still be repositories of PalmOS development guides floating about.
For the hardware, maybe ebay?