Keyboard interface processing to identify connected type of computer

摘要

The interface processing method sending, after firmware execution, with delay of 300ms of stability for main computer, ll bits of BAT CODE by AT/PS2 mode, the data is AAH, with intended reverse direction to generate errors. Then continue trying to send erroneous BAT CODE, until the code is sent. The last data of sent code is detected if it is LOW, then the system is XT type, and this system enters XT program execution, reset data and set CLOCK.When the data is not reset by computer, detect CLOCK and data after lms delay. If both are reset by computer, then this system accepts the command of computer. If data is RESEND or RESET, then this computer is AT/PS2 type. If the command is not an assigned command, or the acceptance fails, then this system jumps out and tries to send erroneous BAT CODE.f