Register parameters
RST 20H, DEFW $39
IN:
IX = handle of file (or device)
OUT, if call successful:
Fc = 0
A = byte read from stream (file)
OUT, if call failed:
Fc = 1
A = error code:
RC_EOF ($09), end of file reached
RC_HAND ($08), bad handle supplied in IX
RC_RP ($13), device is read-protected
RC_ESC ($01), escape, if device :COM.0, :PRT.0, or :INP.0
RC_SUSP ($69), if device is :COM.0, :PRT.0 or :INP.0
RC_DRAW ($66), if device is :INP.0
RC_QUIT ($67), if device is :INP.0
RC_TIME ($02), if device is :COM.0 or :PRT.0
Registers changed after return:
..BCDEHL/IXIY same
AF....../.... differentÂ
Related calls
GN_Cl, close file
GN_Del, delete a file from memory
GN_Opf, open file/resource (wildcard search)
GN_Ren, rename file
OS_Cl, internal close (OZ usage)
OS_Del, file delete (internal OZ usage)
OS_Frm, file read miscellaneous
OS_Fwm, file write miscellaneous
OS_Gbt, get byte from file (or device) with timeout
OS_Mv, move bytes between stream and memory
OS_Op, internal open (OZ usage)
OS_Pb, write byte to file, device
OS_Pbt, write byte to file, device with timeout
OS_Ren, file rename (internal OZ usage)