igs_grfx_write
igs_grfx_write(iot, ioh, 0, 0x00);
igs_grfx_write(iot, ioh, 1, 0x00);
igs_grfx_write(iot, ioh, 2, 0x00);
igs_grfx_write(iot, ioh, 3, 0x00);
igs_grfx_write(iot, ioh, 4, 0x00);
igs_grfx_write(iot, ioh, 5, 0x60); /* SRMODE, MODE256 */
igs_grfx_write(iot, ioh, 6, 0x05); /* 64k @ a0000, GRAPHICS */
igs_grfx_write(iot, ioh, 7, 0x0f); /* color compare all */
igs_grfx_write(iot, ioh, 8, 0xff); /* bitmask = all bits mutable */
igs_grfx_write(iot, ioh, 0x00, 0x00);
igs_grfx_write(iot, ioh, 0x01, 0x00);
igs_grfx_write(iot, ioh, 0x02, 0x00);
igs_grfx_write(iot, ioh, 0x03, 0x00);
igs_grfx_write(iot, ioh, 0x04, 0x00);
igs_grfx_write(iot, ioh, 0x05, 0x60);
igs_grfx_write(iot, ioh, 0x06, 0x05);
igs_grfx_write(iot, ioh, 0x07, 0x0f);
igs_grfx_write(iot, ioh, 0x08, 0xff);