PORTIBM PC Portable (uses same BIOS as XT) 0746 - Gravis Ultra Sound by Advanced Gravis - BOARD VERSION / MIXER SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0240h-024Fh,PORTIBM PC Portable (uses same BIOS as XT) 0340h-034Fh 0746 R- board version (rev 3.7+) FFh Pre 3.6 boards, ICS mixer NOT present 05h Rev 3.7 with ICS Mixer. Some R/L: flip problems. 06h-09h Revision 3.7 and above. ICS Mixer present 0Ah- UltraMax. CS4231 present, no ICS mixer 0746 -W Mixer Control Port