[G4] SCSI devices -- any way to connect with USB?

[David Minger NPG Cable]

Hi,

I have a series of Macs ranging back to the first 128K Mac in the 80s.

Many of the devices I've accumulated still have some value for me  
(like zips in reading zip disks, a scanner, etc.). But ... the items  
in question use SCSI connections.

Question: how can I connect these SCSI devices to G4s that use USB,  
firewire, etc.?

Thanks in advance,

David in Arizona