# Switch 2/5: 8/16-bit mode

You can install the Smart 16/4 AT Ringnode into either 8- or 16-bit bus slots. If you want to put it in a 16-bit slot, but you need an 8-bit transfer mode, set switch 2/5 to OFF.

Switch 2/5 | Mode
ON (Default) | 8/16-bit mode
OFF | Force 8-bit mode

You must use 16-bit mode if you are installing the Ringnode in a Novell NetWare 4.x or 3.x server.

The following table summarizes the types of data transfer associated with different combinations of switches 2/4 and 2/5, and with the Ringnode in an 8- or 16-bit expansion slot:

Switch settings | 8-bit slot | 8-bit slot | 16-bit slot | 16-bit slot
Switch 2/4 setting | ON | OFF | ON | OFF
Switch 2/5 ON | c | c | a | b
Switch 2/5 OFF | c | c | c | c

Types of data transfer associated with different settings of switches 2/4 and 2/5

a | = | 16-bit bus master DMA
b | = | 16-bit I/O transfer
c | = | 8-bit I/O transfer