o for unknown int21 functions, set the CY bit to indicate failure o When reporting a int21 function we don't know about yet, report   AH as the major and AL as the minor, as opposed to reporting AL   as the major. o Add support for 21:44:7: ioctl check output status.  We   optimistically say that output is always ready. o Add half support for 21:23: get file size.  We always now return   failure.  This function isn't supported, according to the interrupt   list, by the DOS box in windows, so I don't feel too bad.
o for unknown int21 functions, set the CY bit to indicate failure
o When reporting a int21 function we don't know about yet, report
  AH as the major and AL as the minor, as opposed to reporting AL
  as the major.
o Add support for 21:44:7: ioctl check output status.  We
  optimistically say that output is always ready.
o Add half support for 21:23: get file size.  We always now return
  failure.  This function isn't supported, according to the interrupt
  list, by the DOS box in windows, so I don't feel too bad.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase