Read catalogue info for named stamped object
=> R0 = 20, 21, 22 or 23
R1 = pointer to filename
if R0 = 20 : use File$Path
if R0 = 21 : R4 = pointer to path string
if R0 = 22 : R4 = pointer to path variable
if R0 = 23 : use no path
<= R0 = object type
R2 = load address, without top three bytes if file is typed
R3 = exec address
R4 = object length
R5 = object attributes
R6 = filetype (images and directories report as &1000,
applications as &2000, untyped files as -1)
PRM doesn't say so, but it would be wise to assume R2-R6 corrupted if object not found.
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