I’ve had this Newton Message Pad 120 for a couple years. I pulled it out to see if I could remember, without the manual, how to back it up to the Mac, transfer “packages” to the Newton. I’d made a fair number of calendar, notes, and names additions to the Newton so a backup was prudent. Link to manual. http://www.newted.org/download/manuals/0307258ANEWTONMP.PDF
I hooked up the serial ADB cable to the modem port on the Mac and the port on the side of the Newton. Then, I started up the Newton and the Newton Connevtions Utility program on the Mac. The Newton will ask you to establish a connection. Mine is serial via the modem port on the Mac. Baud rate is 9600. I remember when that was fast. Here is the Main screen with the Connection icon in the upper right corner. Tap it and start connection process. You have to start up the Newton Connection Utility program also. [ I have a few more images to add to illustrate some actions and steps. ] Link to programs site: http://www.unna.org/
When you tap connection you choose type. Mine is serial. Here is the link to Specs: http://tim.id.au/laptops/apple/misc/messagepad_100.110.120.130.pdf
Once handshake is complete here’s the screen. Link to version 2 of the OS: https://manuals.info.apple.com/MANUALS/1000/MA1493/en_US/0307843ANOS2FTURS.PDF
Below is ChessClock package I transferred. I have a 4 MB Card and after I transfer the programs I move them the Card. This is done by holding stylus on the program icon until the Newton beeps. Then you select the file folder icon at the bottom of the display and selecting Card. It’s easy to fill up the main internal memory.