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Register parameters

Code Block

language	none
title	RST 20H, DEFW $180C

IN:
     C = reason code
       DQ_Dev ($00), define default device 
       DQ_Dir ($03), define default directory 
       DQ_Fnm ($06), define filename match string
     B = 0, always
     HL = points to a null-terminated string, the argument

OUT:
     Fc = 0,   Successful
     Fc = 1, A = RC error if failure

Registers affected after return:
     ..BCDEHL/IXIY same
     AF....../.... different

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