iMac G3 (Slot) Down Converter Board $25.00 Compatible with all Slot Loading iMac G3 computers iMac G3 (Slot) Down Converter Board quantity Add to cart Add to Quote Continue Shopping Category: M5521 iMac G3 (Slot Load) Description Down Converter Board – 922-4026, 6870T194D10. Compatible with all slot loading iMac G3 computers.