User`s guide

bits 8,9 -Console status mode for RSXs that perform console input redirec-
tion from a file. These bits determine how the RSX responds to
console status requests.
bit 8 = 03 bit 9 = 0 - conditional status
bit 8 = 01 bit 9 = 1 - false status
bit 8 = 1, bit 9 = 0 - true status
bit 8 = 11 bit 9 = 1 - bypass redirection
Note that the Console Mode bits are numbered from right to left.
The CCP initializes the Console Mode to zero when it loads a program unless the
program has an RSX that overrides the default value. Refer to Section 2.2.1 for
detailed information on Console Mode.
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BDOS Function Calls CP/M 3 Programmers Guide