diff --git a/programs/isa.asm b/programs/isa.asm
new file mode 100644
index 0000000..2d50ab9
--- /dev/null
+++ b/programs/isa.asm
@@ -0,0 +1,39 @@
+.model tiny
+.486
+smart
+.code
+
+org 0100h
+
+start:
+
+PNP_ADR_PORT        equ 0x279
+PNP_WRITE_PORT      equ	0xA79
+;MIN and MAX READ_ADDR must have the bottom two bits set
+MIN_READ_ADDR	    equ	0x203
+MAX_READ_ADDR	    equ	0x3FF
+;READ_ADDR_STEP must be a multiple of 4
+READ_ADDR_STEP	    equ	8
+
+;bits
+CONFIG_WAIT_FOR_KEY equ	0x02
+CONFIG_RESET_CSN    equ	0x04
+IDENT_LEN           equ	9
+
+;renvoie le timer en ax
+ctc:
+    cli
+    mov  dx,043h
+    mov  al,0
+    out  dx,al
+    mov  dx,40h
+    in   al,dx
+    mov  ah,al
+    in   al,dx
+    sti
+    ret
+    
+;attend pendant ax microsecondes
+usleep:
+
+end start