Int 16 Fn FFDD U - PC Tools V5.1-5.5 Pcshell API - Get ??? [U]
AX = FFDDh
BX = 0002h
Return: AL =
00h ???
01h ???
Note: PCShell v6.0+ displays the error message "Incorrect PCRUN version",
awaits a keystroke, and aborts the current process
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