Int 49 Fn 12  - Ti Professional Pc - Crt - Fill Entire Screen With Attrib  [V]

   AH = 12h
   AL = attribute (see #2881)

Return: nothing

Note:  AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs

See Also: AH=01h,AH=02h

Bitfields for TI Professional PC screen attribute:
Bit(s) Description (Table 2881)
 7 alternate character set (requires user-supplied ROM)
 6 blink
 5 underline
 4 reverse video
 3 character enable
 2 green (color) or 58% intensity (gray-scale)
 1 red (color)  or 27.5% intensity
 0 blue (color) or 14.5% intensity