You're pretty vague. What operating system are you running? What do you want to do? The phone comes with a USB cable.
If you just want to access files on the phone's microSD card, then on the phone screen choose Tools > More Tools > Mass Storage > Yes. THEN as the screen says, plug it in to your computer.
It should show up in My Computer as "Removable Drive" and you can move and copy files to and from the phone's microSD card.
On XP and Vista a "Safely Remove Hardware" icon should appear in the system tray in your start bar, use that when you're done moving files.
If you want to use the phone as a
modem, which is the way that Bitpim and other transfer programs talk to the phone, then you need to install drivers. That's the hell I'm in now, I'm having trouble getting a Katana DLX to work with Bitpim in both Windows XP and Windows Vista.
On Windows, Sprint's huge program "Sprint PCS Connection Manager for Phone as Modem/USB Cables" contains Sanyo USB drivers. However, Sprint's site doesn't claim version 3.07.044 supports the 8500 (Katana DLX) . If you want to try it, you can download it from sprint.com/downloads. To avoid installing 40 MB of crap just for a simple driver, I used Universal Extractor, from legroom.net/software/uniextract to open up the Sprint_PCS_CM_v044.msi file, and inside it there's a program files\Common Files\Sprint\Sanyo USB\SANYO_Installer\US_UsbDriver.exe. However, after running this I still don't have a working modem driver.
If you have a working modem driver from the "CD of drivers" then please contact info at skierpage.com to share it! To use the phone as a modem don't run mass storage on the phone as I described above.
Instead, just plug the phone in to USB. The phone should detect this and ask what you want to do. One option is mass storage, but another is Modem. Choose that. Then, software on the PC like Bitpim should be able to locate the phone.
However, if you can't get the modem driver to work, Bitpim won't work.
Windows is awfully unfriendly when a "plug-and-play" device
don't play after plugging. Control Panel > System > Hardware > Device Manager may show a ? or ! under Modems or Other devices that may help you debug the problem.