Mainboard for 800/880 G9 — M99817-001 / M99817-601 (Compatible with M81591-001, M81592-001)

Replacement mainboard designed for 800 and 880 G9 systems. Primary part numbers: M99817-001 and M99817-601. Cross-references: M81591-001 and M81592-001. Fits as a direct motherboard replacement for units that require any of the listed SKUs.