How to break Toshiba SP4600 Laptop CMOS PAS...

reset the bios by unpluging to battery.

reset the bios by unpluging to battery doesed work
this is the only working solution:

To reset the password of an old Toshiba, you can use KeyDisk. (cf my web page)
If this doesn't work, you can try to build the Toshiba Parallell loopback.
To make a simple device that you connect to your parallell port, a lot of
Toshiba computers remove the password when you boot it up.
The device, named "loopback" by some, could be made out of any
parallell wire with 25pins connectors (db25). You should connect
these pins: 1-5-10, 2-11, 3-17, 4-12, 6-16, 7-13, 8-14, 9-15, 18-25.
A db25 looks like:
1 13
_______
\_____/