Compatibility: 5.0+
Expects: AX    b000H
Returns: AL    status: 00H = GRAFTABL.COM is not installed
ffH = GRAFTABL.COM is installed
Info: Checks to see if the DOS 5.0+ GRAFTABL.COM program has been
executed and its graphics-character definitions have been made

GRAFTABL.COM installs data that defines how ASCII characters 80H-
ffH are displayed while in graphics mode (see Video Modes).  It
loads about 1K of data into memory and modifies the INT 1fH
vector to point to that data.

GRAFTABL.COM is used only by CGA owners, and even then, very

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INT 2fH b000H: Is GRAFTABL.COM Installed?