When the  Option-2 (for UMAC Turbo CPU) or Option-2A (for PMAC2A-PC/104) is ordered, the PC/104 interface is installed which allows mounting of an entire PC-compatible computer inside the UMAC rack system or on the bottom of the PMAC2A-PC/104controller. The PC/104 assembly occupies five UMAC rack positions. Since this assembly does not plug into the UBUS backplane, the five positions are counted for the pack frame selection (ACC-Px) but not for the UBUS selection (ACC-Ux).

DeltaTau can provide this style computer when you order ACC-PC104 and it can have installed any user prefered operating system (Windows based). PC-compatible embedded PC/104 computers may also be purchased from third parties, but care must be taken to make sure that all components are PC/104 form-factor compliant (most are not). External power supply is required, for 5VDC,+/-15V.