The JOY-7SA was an unofficial joystick device for Fujitsu's 8-bit personal computers "FM-7" and "FM NEW7," and was a peripheral designed to significantly improve game operability at the time. ◎ Features and Structure - Connection Method: It connects by physically intervening between the FM-7's keyboard and motherboard. This unique connection method was adopted because the FM-7 did not have a standard joystick port. - Input Method: It physically emulates key inputs (such as the numeric keypad's "4," "6," "8," and "2") corresponding to each direction of the joystick. The center position is equivalent to the "5" key being pressed, which stops the character's movement. - Requires Case Modification: A bold modification was required, involving drilling a hole in the FM-7's case to pass the cable through. ◎ Background and Significance The FM-7 was originally designed for business use, so there was no interface optimized for game operation, and operation with the numeric keypad was very difficult. Devices like the JOY-7SA were a valuable asset for users at the time, as a means of dramatically improving the comfort of gameplay. ※ Unused item. ※ Operation is unconfirmed, so it is listed as "junk."