several fixes

OperatingSystem/Applications/displaydemo/kbdtest.asm

@@ -0,0 +1,43 @@
+.include "extern_symbols.s" ;include monitor symbols.
+    START_ADDR   .EQU 0x8000
+    
+    org START_ADDR  
+com_header:
+    jp com_prg
+    db 0x00
+    dw 0x00, 0x00, 0x00   ;always 0
+    dw [START_ADDR]     ;start addr
+    dw [_eof]           ;end of file
+    dw [_eof - START_ADDR]  ;length
+    dc 48,0x00
+    
+com_prg:
+; Program start
+    ld hl, [_isr_pio_test]
+    ld (INT_VEC_TABLE + 2), hl
+
+    ;setup PIO
+    ld a, 11001111b ;setup as controll port
+    out (INT_PIO_ADDRC), a
+    ld a, 11110111b      ;set all as inputs
+    out (INT_PIO_ADDRC), a
+    ld a, 00000010b ;set interrupt vector
+    out (INT_PIO_ADDRC), a
+    ld a, 11010111b ;enable interrupt; logic or, mask follows
+    out (INT_PIO_ADDRC), a
+    ld a, 00001011b ;set interrupt mask
+    ;out (INT_PIO_ADDRC), a
+    ;in a,(INT_PIO_ADDRD); clear buffer
+    ld a, 10000011b ;enable interrupt
+    out (INT_PIO_ADDRC), a
+    ;call keyboard_init
+    ;call keyb_cmd_enable
+    ;call keyb_enable_int
+    
+    ret
+
+    .include "kdrv_vt82c42.s"
+    .include "kdrv_int.s"
+_eof:
+
+