IBM 09-0572-000 manual Ring Speed, I/O Base Address

B-4 APPENDIX B: SPECIFICATIONS

Ring Speed

The 3C619C adapter operates at either 4- or 16-Mbps ring speed. The adapter ring speed must match the speed of the token ring network. The default is 16 Mbps.

I/O Base Address

In IBM mode when only one adapter is installed, it is designated the Primary adapter. The Primary/Alternate option can be changed with the Configuration and Diagnostic Program. The base address allowed in IBM mode is A20h or A24h. The default is A20h.

In 3Com mode the adapters are designated by their I/O base addresses. The I/O base addresses allowed in 3Com mode are as follows, with the default in bold:

A20h	260h	2E0h	370h
A24h	270h	300h	380h
200h	280h	310h	390h
210h	290h	320h	3A0h
220h	2A0h	330h	3B0h
230h	2B0h	340h	3C0h
240h	2C0h	350h	3D0h
250h	2D0h	360h	3E0h

If a system resource conflict exists, you may have to change the settings of other adapters or options that are in your PC.