Move over, Dick Tracy: I'm wearing a PC on my wrist.

Well, it's actually more like a personal digital assistant (PDA) plus a few games, but it looks like a small computer.And while it may not handle voice transmissions, it still makes the classic cartoon detective's two-way wrist radio look like an antique.

The onHand PC from Matsucom Inc. ($249.95), which is an English version of Seiko's RuPuter, can handle all the usual stuff - names, addresses and appointments. And it can replace your watch.

But that's only the beginning.

You see, it really is a PC with its own operating system. That means you can download games, graphics and text to it.

So, for example, if you need a map and directions to Aunt Ethel's house, you can call them up on your computer and download them to the wrist computer for easy access on the road.

This is truly an item only geeks like me could love. It's big, it's ugly and its rubberized watch band gave me a rash. But you'll never get me to give it up.

For those who are interested, here are the features:

* A 16-bit central processing unit with 128 kilobytes (KB) of main memory, 512 KB of read-only memory to store the programs and data, and two megabytes of flash memory.

* A 102-by-64 dot-matrix LCD display with a backlight.

* Infrared and serial port interfaces to connect to a personal computer.

* Approximately three months of battery life from two lithium batteries.

* A hefty 52-gram weight.

* Built-in applications that include a file manager, scheduler, address book, job list, a text/memo function, a digital clock with a four-channel weekly alarm, world time, a calculator, a timer, a chronograph, four games; and text, image and sound viewers.

* PC software for file management, personal information management (PIM) and for setting up ''tools'' for the watch.

* The ability to synchronize with most of the standard PIMs on the market, including Microsoft Outlook, ACT, Goldmine, Palm Desktop and Lotus Organizer.

* A built-in ''touch'' keyboard, similar to the one on Franklin's REX Pro, so you can type data directly into the watch.

* The ability to download or upload data, sounds and pictures between the watch and your PC.

Right now you can only purchase the computer watch through the company's Web site:

The site will soon be hosting a user forum where you'll be able to download new applications and games to it.

This is apparently the first of what may become a whole line of hardware products the company will be licensing from Japan for distribution in the United States, so stay tuned.