Ampro Corporation LITTLE BOARD 5001451A - Manual (Page 58)

2-40
Ampro Common Utilities manual. The following simple assembly language routine illustrates how
to control the watchdog timer using the Ampro ROM-BIOS function provided for this purpose:
;----------------------------------------------------------
; Watchdog timer control program
;----------------------------------------------------------
MOV AH,0C3h ; Watchdog Timer BIOS function
MOV AL,nn ; Use “00” to disable, “01” to enable
; timer.
MOV BX,mm ; Selects time, in seconds
;(00-FFh; 1-255 seconds)
INT 15h
Utility Connectors (J19)
The Utility connector is 44-pin dual row 2mm. Several functions appear on the Utility connector.
Table 2-38 shows the pinout and signal definitions. Since there are connections for diverse features
on this single connector, a discrete-wire connector is recommended. Table 2-39 shows
manufacturer’s part numbers for both types of mating connectors.