Hi,

Valeriy E. Ushakov wrote:

> PS: I tried to find out what is the companion chip in 54x, but I
> can't.  "F1796" that hpcsh port page lists doesn't tell anything.
> There is a teardown report for 548 with all the photos at
> www.teardown.com, but it costs money to access.

If this web page can be believed: 
http://www.jonpeddie.com/dispatches/PalmShow/PalmDispatches.shtml

The 54x uses an Epson S1D13505 companion chip.

Regards,

Ross..