A Simple Real-Time Executive
By Charles B. Allison, November 01, 1992
November 1992/A Simple Real-Time Executive/Listing 1
/* ----------- tinyexec.h------------ */
#define TIMER 8
/* interrupt vector for this real time clock */
#define TIMR1_C 0x43
/* control register for xt timer intel 8253 */
#define TIMR1_T1 0x40
/* timer register for xt timer intel 8253 */
#define LOAD_T1 0x34
/* select load timer 1 register 2 bytes */
#define XT8259 0x20
/* define port to clear xt interrupt controller */
#define CLR_INT 0x20
/* define nonspecific interrupt clear for intel 8259 */
#define IN PROC 0x80
#define REQ_TASK 0X40
/* ----------- end tinyexec.h------------ */
/* End of File */
