User`s guide

BDOS FUNCTION 11: GET CONSOLE STATUS
Entry Parameters:
Register C: OBH
Returned Value:
Register A: Console Status
The Get Console Status function checks to see if a character has been typed at
the logical console, CONIN:. If the Console Mode is in the default state (see
Section 2.2.1), Function 11 returns the value 01H in register A when a character is
ready. If a character is not ready, it returns a value of 00H.
If the Console Mode is in CTRL-C Only Status mode, Function 11 returns the
value 01H in register A only if a CTRL-C has been typed at the console.
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BDOS Function Calls CP/M 3 Programmers Guide