Compaq 4000N - Manual (Page 82)

Chapter 4 System Support
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
4-40
Configuration Byte C7h, C8h, Serial Ports 1 and 2 (Respectively) Configuration Bytes
Default Value = FEh, 7Dh
Bit Function
7..2 Base I/O Address (in packed format)
(Algorithm: [Addr. - 200h] / 8)
(i.e., 3Fh = 3F8h, 1Fh = 2F8h, 00 = 200h)
1..0 Reserved