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Return Codes
The following hexadecimal return codes are stored in both the AL
(AX) register and the return code field of the output parameter:
No error
53 SMAPI function is not available
81 Invalid parameter
86 Function is not supported
9 System error
91 System is invalid
92 System is busy
A Device error (disk read error)
A1 Device is busy
A2 Device is not attached
A3 Device is disabled
A4 Request parameter is out of range
A5 Request parameter is not accepted
All other values are reserved.
SMAPI BIOS B-11