Computer with security device for controlling access thereto

A computer having two disk drives receiving spaces, a floppy disk drive provided in one of said disk drive receiving spaces, a computer keyboard, a computer power supply, and a main system board with a clock generator circuit and a power on reset circuit, wherein the improvement comprises:

• an access control device comprising:
• a casing having a front panel and a pair of side panels which cooperatively define a receiving space, said casing being received in the other one of said disk drive receiving spaces;
• a keypad provided on said front panel and operated so as to provide an input password;
• and a control unit provided in said receiving space of said casing and being electrically connected to said keypad;
• and
• said control unit comprising:
• a memory unit containing a desired password;
• a microprocessor unit receiving said input password from said keypad and generating an activating signal when said input password tallies with said desired password in said memory unit;
• and at least one control circuit connected to a respective one of said computer keyboard, said floppy disk drive and said main system board and being actuated by said activating signal from said microprocessor unit so as to unlock and enable the respective one of said computer keyboard, said floppy disk drive and said main system board.