From c96245788f39d77cfda01dc178f18226fc2ee4df Mon Sep 17 00:00:00 2001
From: Johannes Theiner <j.theiner@live.de>
Date: Thu, 25 Oct 2018 11:26:51 +0200
Subject: [PATCH] =?UTF-8?q?a2:=20bearbeitet=20w=C3=A4hrend=20Praktikum?=
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---
 src/a2.asm | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/src/a2.asm b/src/a2.asm
index dd8bcec..16e80e1 100644
--- a/src/a2.asm
+++ b/src/a2.asm
@@ -18,15 +18,39 @@
 ;E=01111001=79
 ;F=01110001=71
 
+INPUT	equ 0h
+LED	equ 0h
+SEGM	equ 90h
 
-;           0      1    2      3    4    5      6    7     8    9      A     B     C     D     E    F
-SEG     db 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0xFF, 0x39, 0xBF, 0x79, 0x71
+
+;           0    1    2      3    4      5    6     7    8      9     A     B     C      D      E    F
+segtext	db 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0xFF, 0x39, 0xBF, 0x79, 0x71
+res	db 0x0
 
 
 	jmp WDH
 
+WDH:	in ax, INPUT
+	mov res, ax
+	and ax, 00001111b;get second nibble
+	out LED, ax;debug, output to leds
+	push ax;write result to stack
 
-WDH:	in ax, 0
-	out 90h, ax
-	out 0, ax
+
+	mov ax, res
+	mov cl, 4
+	shr ax, cl;shift right 4 times
+	and ax, 00001111b;might not be needed
+	out LED, ax;debug, output to leds
+	push ax;write result to stack
+
+
+	pop ax;get from stack
+	pop bx;get from stack
+	
+	sub ax, bx
+	
+	out LED, ax;output to led
+
+	out SEGM, al;output to seven segment display
 	jmp WDH