1 /* Thanks to Alex Russell for example code */
2 /* Thanks to Gary Neal for example code */
6 static byte key[NUM_SCANCODES]; // pressed
7 static byte kea[NUM_SCANCODES]; // released
9 #ifdef __cplusplus /* Function must be declared C style */
12 static void interrupt (far *oldkb)(void) = NULL; /* BIOS keyboard handler */
18 * Comment out the following #define if you don't want the testing main()
24 /*****************NEW KEYBOARD 09h ISR***********************/
25 void interrupt newkb(void){
29 kee = inp(0x60); /* Read the keyboard scan code */
31 /* Clear keyboard controller on XT machines */
32 qx = inp(0x61); /* Get keyboard control register */
34 outp(0x61, qx); /* Toggle acknowledge bit high */
36 outp(0x61, qx); /* Toggle acknowledge bit low */
38 /* Interpret the scan code and set our flags */
40 printf("%d[%d]\n",kee,key[kee]);
43 key[kee & 0x7F] = 0; // a key is released
45 key[kee] = kea[kee] = 1; // a key is pressed
47 /* Acknowledge the interrupt to the programmable interrupt controller */
48 outp(0x20, 0x20); /* Signal non specific end of interrupt */
51 /* ---------------------- init_keyboard() ---------------- April 17,1993 */
52 /* restore the bios keyboard handler */
53 /* ---------------------- deinit_keyboard() -------------- April 17,1993 */
55 int i; /* Index variable */
56 if(!vq){ // deinitiation
57 /* Abort if our function pointer has no valid address */
58 if(oldkb == NULL) return;
59 /* Set address in our function pointer in interrupt vector table */
60 _dos_setvect(9, oldkb);
61 /* Reset our function pointer to contain no valid address */
64 /* Print the key heap */
66 for(i=0; i<NUM_SCANCODES; i++){
67 if(i==NUM_SCANCODES/2) printf("================================\n");
68 printf("%03d[%d][%d]",i+1,key[i],kea[i]);
69 if(key[i]==1)printf("====");
73 }else if(vq == 1){ // initiation
76 /* Abort if our function pointer has a valid address. */
77 if(oldkb != NULL) return;
79 /* Clear the keyboard buttons state arrays */
80 for(i = 0; i < NUM_SCANCODES; i++)
83 /* save old BIOS key board handler */
84 oldkb = _dos_getvect(9);
86 // turn off num-lock via BIOS
87 lock_key = MK_FP(0x040, 0x017); // Pointing to the address of the bios shift state keys
88 *lock_key&=(~(16 | 32 | 64)); // toggle off the locks by changing the values of the 4th, 5th, and 6th bits of the address byte of 0040:0017
89 oldkb(); // call BIOS keyhandler to change keyboard lights
91 /* setup our own handler */
92 _dos_setvect(9, newkb);
96 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
99 * Returns the status of the key requested. *
100 * The status is 1 if the key is pressed or has been pressed since the *
101 * last call to this function for that particular key. *
102 \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
104 register char retVal;
106 /* Key value in range of keyboard keys available */
109 /* Get the status of the key requested */
110 retVal = key[c] | kea[c];
112 /* Reset the was pressed status for the requested key */
115 /* Return the requested key's state */
121 * The library testing routines follows below.
127 * Library test (program) entry point.