accepts 1M×4 ZIPs in groups of four, giving 2, 4 or 8 MB configurations
sandwich board construction results in a slimline case
connects to the side expansion port, with passthrough connector
supports autoconfiguration
no battery backed realtime clock
unit is marked AX508 with different RAM options on the bottom side, however the unit was marketed depending on the RAM configuration as AX502 (2MB), AX504 (4MB), AX508 (8MB) and AX508U (no RAM installed)