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Register parameters

RST 20H, DEFB $7B
IN:
     L = reason code
     Other register parameters depend on reason code
OUT:
     Depends on reason code, see below. 
 

Notes

Internal operating system usage. This call is used to allocate all I/O type handles. The handle type and structure is documented in handle.def file.

 

FN_AH (A = $01), Allocate handle
IN:  A = FN_AH ($01)
	 B = handle type
     B = 0, does not allocate a handle properly - the next handle is given the SAME number

OUT, if successful:
     Fc = 0, IX = handle

OUT, if failed:
     Fc = 1, A = RC_ROOM

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different

 

 

FN_VH (A = $02), Verify handle
IN:  A = FN_VH ($02)
     B = handle type
     IX = handle

OUT, if successful:
     Fc = 0

OUT, if failed
     Fc = 1, A = RC_ROOM

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


FN_FH (A = $03), Free handle
IN:  A = FN_FH ($03)
     B = handle type
     IX = handle

OUT, if successful:
     Fc = 0, IX = 0

OUT, if failed:
     Fc = 1, A = RC_HAND

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different


FN_AH (A = $04), Get (Find) handle (OZ 4.6 and newer)
IN:  A = FN_GH ($04)
     IX = first handle to test, 0 to begin with top handle
     B = handle type
     C = dyn id, 0 to bypass the check

OUT, if successful:
     Fc = 0, IX = handle

OUT, if failed:
     Fc = 1, A = RC_EOF

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different


FN_NH (A = $05), Get next handle of same type (OZ 4.6 and newer)
IN:  A = FN_NH ($05)
     IX = handle to test
OUT, if successful:
     Fc = 0, IX = handle
OUT, if failed:
     Fc = 1, A = RC_EOF

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different

 

 

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