I'm not sure if the service itself is still functional.
Obviously, but if a simple dial-up terminal ROM could be made then you would just need to find an ISP that still offers dial-up Unix shell access, like:
and maybe use a PS/2 keyboard mod for text input?
or see if any dial-up bulletin board systems still exist in your area? or setup a new one?
or if somebody wanted to act as a host then it's fairly straight forward to setup a dial-in server in Linux to share your internet connection:
http://www.howtoforge.com/linux_dialin_server
http://derrick-caluag.blogspot.com.au/2
linux.html
and then you could do something really nerdy like use Twitter or Facebook from the command line:
http://www.floodgap.com/software/ttytter/
http://fbcmd.dtompkins.com/
Apparently the cart requires activation before it will do anything making it fairly useless without any modification:
"For those of you considering the purchase of a Shark MX, be advised that since the sale of Gameshark (from Interact to Madcatz), there is no longer any support for this device, nor the proprietary email service (Gameshark BBS). The toll free# on the 30min activation card has been disconnected, and Madcatz has been of little assistance. (Apparently Madcatz only purchased the website and software rights to Gameshark, and not the "technology" portion.)
Without the MX cart first being "activated" with a factory issued REG CODE (via toll free#), the cart will not function at all, rendering it completely useless. I find it odd that Interact would have locked up the entire cart in this manner, as the PDA functions are not in any way linked to the email functions (ie, address book not linked to email composer).
If you're a collector of odds/ends GB carts, it would be a unique buy. It is a cool gizmo. Don't plan on any serious usage of the device though. Good luck with your purchase. 7/2003"