MH> A cell is a pair of character and attribute values. Although the Vio
 MH> subsystem supports 4-byte cells, I don't know of a display card that
 MH> actually has them instead of the standard 2-byte cells that have been
 MH> around since the ages of the CGA display card. 

I believe that the 4-byte format is only really of any importance when you
start mucking around with AVIO presentation spaces.  I doubt that it is
much used even then, since firstly AVIO is only commonly used to emulate a
VGA text-mode session in Presentation Manager, which only requires the
2-byte format; and secondly AVIO is 16-bit and is probably better replaced
by a proper 32-bit custom window class _anyway_.

 ¯ JdeBP ®

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