On Mon, 27 Jun 2011 12:13:50 -0400, Gerhard Postpischil wrote: > >As you pointed out, return codes from TSO macros need to be >checked, but unless the user switches to a smaller screen size, >an error may not be forthcoming, only garbage on the screen. > You can't win. Switching to a larger screen size may result in buffer overrun; switching to a smaller screen size may result in display overrun. And switching to the same size but a different shape (e.g. 30x80 <-> 24x100) results in garbage on the screen. The fundamental design blunder is that 327x screen addressing is not in terms of X-Y coordinates but in serial character cells on the display.
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