Bios Listing; Vectors With Special Meanings - IBM RT Series Hardware Reference Manual

BIOS Listing
Vectors with Special Meanings
Interrupt Hex 42 - Reserved
When an IBM Enhanced Graphics Adapter is installed, the BIOS
routines use interrupt 42 to revector the video pointer.
Interrupt Hex 43 - IBM Enhanced Graphics Video
Parameters
When an IBM Enhanced Graphics Adapter is installed, the BIOS
routines use this vector to point to a data region containing the
parameters required for the initializing of the IBM Enhanced
Graphics Adapter. Note that the format of the table must adhere
to the BIOS conventions established in the listing. The power-on
routines initialize this vector to point to the parameters contained
in the IBM Enhanced Graphics Adapter ROM.
Interrupt Hex 44 - Graphics Character Table
When an IBM Enhanced Graphics Adapter is installed the BIOS
routines use this vector to point to a table of dot patterns that will
be used when graphics characters are to be displayed. This table
will be used for the first 128 code points in video modes 4, 5, and
6. This table will be used for 256 characters in all additional
graphics modes. See the appropriate BIOS interface for
additional information on setting and using the graphics character
table pointer.
IBM Enhanced Graphics Adapter 103