My old paperweight is an Aptiva also...

When you turn on the computer, it shoule start doing a system memory check.

When the system memory check starts, or slightly before it starts the memory check, press the F1 key to go to the system setup.

My Aptiva came with Win 95, and before I could get Dave Brown's simulator to recognize the controller, I had to go to setup and give it a SPECIFIC IRQ & com port setting for the serial port the Computer Design's transmitter interface was plugged into. After specifying a speciffic Com port & IRQ, I was able to use the Computer Design's transmitter interface, and use my R/C transmitter even to control the planes on Microsoft's Flight simulators, or any other program that used joystick inputs.