Specifications

AMD Geode™ GeodeROM Functional Specification 83

Serial Port BIOS Support 32087C

8.0Serial Port BIOS Support

GeodeROM supports the standard INT 14h functions listed in Table 8-1 that pertain to the operation of up to four serial

ports in the system.

8.1 INT 14h Serial Port BIOS Functions Descriptions

This section lists those INT 14h functions supported in GeodeROM, the parameters that system software supplies to each

INT 14h function, and the values each function returns. The I/O address(es) of any port(s) in the system are stored in the

BDA by POST. The WORD-length addresses begin at 40:0h and can go through 40:6h.

8.1.1 Function 00h - Initialize Port

Description:

Sets up the serial port for transmission or reception of data.

Passed:

Table 8-1. INT 14h Functions

Function Number/Name Page Number

Function 00h - Initialize Port 83

Function 01h - Write Character to Port 85

Function 02h - Read Character from Port 85

Function 03h - Get Port Status 86

Parameter Description

AH 00h