=> R0 = 3 or 4
R1 = file handle
R2 = pointer to buffer
R3 = bytes to read
If R0 = 3 :
R4 = file pointer
<= R2 = pointer after data
R3 = number of bytes not transferred
R4 = new file pointer
C is clear if R3 = 0, else it is set.
The 'EOF-error-on-next-read' flag is cleared.
Error is generated if invalid file handle, or directory, or no read access.
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