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Hi, If I put this in RXB in Classic99, I would expect it check for Keyboard L Line and Joystick Left Input. I am interested in Joystick Input in this test case. 100 CALL IO(2,16,8,A,B) 110 CALL HPUT(2,1," ",2,1,A,4,1," ",4,1,B) 120 GOTO 100 I have connected an actual Gamepad to the USB Port and have configured it in Classic99 for Joystick #1. According to Tech Data Manuals, the TMS 9901 has Address: >0008 CruBit: 4 9901: INT4 Pin: 8 Function: Keyboard L Line, Joystick Left. For me the result is that the Joystick movement and the Button has no impact on A and B values. They keep showing 226 and 255. So I wonder what am I doing wrong? Or is it a limitation of the Emulation in Classic99 or a bug in CALL IO? There are so many things to consider: Alpha Lock Bug, 99/4 vs 99/4A Keyboard, 5 Keyboard Modes, Infrared Analog Joysticks in the System Software and Documentation, Wired Joysticks. There is a SCAN Routine in GPL and one in Assembler, there are certain locations in Ram that store the XPOS and YPOS from the Joystick. ... Can anyone give me some hints here?