Found only in the A3000 and A4000 series machines, the Ramsey is responsible for addressing RAM and producing DMA addressing, particularly with regards to the motherboard SCSI controller. Ramsey 04 is normally used with DMac 02, and Ramsey 07 is normally used with Dmac 04.

Chip Number	Part Number	Used in
Ramsey	390398-01	A590, A2091
Ramsey 51	390541-04	A3000, A4000
Ramsey 45	390541-07	A3000T, A4000, A4000T