Specifications

2.7 Real Time Clock/Cal en dar
The EBC- BX con tains an on board Clock/Cal en dar within the Victory-66 chip. This clock is fully
com pati ble with the MC146818A used in the origi nal PC- AT com put ers. This clock has a number of
fea tures in clud ing pe ri odic and alarm in ter rupt ca pa bili ties. In ad di tion to the time and date keep ing
func tions, the sys tem con figu ra tion is kept within the CMOS RAM con tained in the clock sec tion. This
RAM holds all of the setup in for ma tion re gard ing hard and floppy disk types, video type, shad ow ing,
wait states, etc. Ref er to the sec tion on the Award BIOS Setup for what is con fig ured via the CMOS
RAM.
It may be come nec es sary at some time to make the CMOS RAM for get its cur rent con figu ra tion and
to start fresh with fac tory de faults. This may be ac com plished by re mov ing power from the board . Then
re move the jumper from pins 2-3 on J27 and place on pins 1-2 for 10 sec onds. Re place the jumper on
J27 pins 2-3, power- up, and re con fig ure the CMOS set tings as de sired.
If is de sired to op er ate the board with out a bat tery J27 must be jumpered on pins 1-2.
2.8 Key board In ter face
The EBC- BX con tains an on board PS/2 style key board con trol ler. Key board con nec tion is made
through the Multi-I/O con nec tor at J2. An adapter ca ble P/N CBL- 247-1 is avail able from Win Sys tems
to make ready ac cess to all of the de vices ter mi nated at the Multi-I/O con nec tor. Us ers de s ir ing cus tom
con nec tions should ref er to the Multi-I/O con nec tor pin defi ni tions given later in this man ual.
Page 2 - 4 OPERATIONS MANUAL EBC-BX 030923
WinSystems - "The Embedded Systems Authority"
1 o
2 o
3 o
J27
J27 Bat tery Se lect Jumper