1 /* Thanks to Alex Russell for example code */
2 /* Thanks to Gary Neal for example code */
3 /* working out the licencing~ */
4 #include "src/lib/dos_kb.h"
7 static byte key[NUM_SCANCODES]; // pressed
8 static byte kea[NUM_SCANCODES]; // released
10 #ifdef __cplusplus /* Function must be declared C style */
13 static void interrupt (far *oldkb)(void) = NULL; /* BIOS keyboard handler */
19 * Comment out the following #define if you don't want the testing main()
25 /*****************NEW KEYBOARD 09h ISR***********************/
26 void interrupt newkb(void){
30 kee = inp(0x60); /* Read the keyboard scan code */
32 /* Clear keyboard controller on XT machines */
33 qx = inp(0x61); /* Get keyboard control register */
35 outp(0x61, qx); /* Toggle acknowledge bit high */
37 outp(0x61, qx); /* Toggle acknowledge bit low */
39 /* Interpret the scan code and set our flags */
41 //printf("%d[%d]\n",kee,key[kee]);
45 key[kee & 0x7F] = 0; // a key is released
47 key[kee] = kea[kee] = 1; // a key is pressed
49 /* Acknowledge the interrupt to the programmable interrupt controller */
50 outp(0x20, 0x20); /* Signal non specific end of interrupt */
53 /* ---------------------- init_keyboard() ---------------- April 17,1993 */
54 /* restore the bios keyboard handler */
55 /* ---------------------- deinit_keyboard() -------------- April 17,1993 */
57 int i; /* Index variable */
58 if(!vq){ // deinitiation
59 /* Abort if our function pointer has no valid address */
60 if(oldkb == NULL) return;
61 /* Set address in our function pointer in interrupt vector table */
62 _dos_setvect(9, oldkb);
63 /* Reset our function pointer to contain no valid address */
66 /* Print the key heap */
68 for(i=0; i<NUM_SCANCODES; i++){
69 if(i==NUM_SCANCODES/2) printf("================================\n");
70 printf("%03d[%d][%d]",i+1,key[i],kea[i]);
71 if(key[i]==1)printf("====");
75 }else if(vq == 1){ // initiation
78 /* Abort if our function pointer has a valid address. */
79 if(oldkb != NULL) return;
81 /* Clear the keyboard buttons state arrays */
82 for(i = 0; i < NUM_SCANCODES; i++)
85 /* save old BIOS key board handler */
86 oldkb = _dos_getvect(9);
88 // turn off num-lock via BIOS
89 lock_key = MK_FP(0x040, 0x017); // Pointing to the address of the bios shift state keys
90 *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
91 oldkb(); // call BIOS keyhandler to change keyboard lights
93 /* setup our own handler */
94 _dos_setvect(9, newkb);
98 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
101 * Returns the status of the key requested. *
102 * The status is 1 if the key is pressed or has been pressed since the *
103 * last call to this function for that particular key. *
104 \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
106 register char retVal;
108 /* Key value in range of keyboard keys available */
111 /* Get the status of the key requested */
112 retVal = key[c] | kea[c];
114 /* Reset the was pressed status for the requested key */
117 /* Return the requested key's state */
123 * The library testing routines follows below.
129 * Library test (program) entry point.