User`s guide

Table 3-5. Program Return Codes
Code Meaning
0000 - FEFF Successful return
FF00 - FFFE Unsuccessful return
0000 The CCP initializes the Program Return Code to zero unless
the program is loaded as the result of program chain.
FF80 - FFFC Reserved
FFFD The program is terminated because of a fatal BDOS error.
FFFE The program is terminated by the BDOS because the user
typed a CTRL-C.
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BDOS Function Calls CP/M 3 Programmers Guide