diff --git a/.gitignore b/.gitignore
index 8d69b04..e5638cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,14 @@
 .cproject
 .project
 .settings
+gmon.out
 */.depend
+server/gmon.out
 server/modelbahn-cgi
 server/modelbahn-server
 server/test-json
+z21emu/gmon.out
+z21emu/config.h
 z21emu/z21emu
 *~
 *.oo
diff --git a/server/server.cc b/server/server.cc
index 8da5d57..c8cd199 100644
--- a/server/server.cc
+++ b/server/server.cc
@@ -43,7 +43,7 @@ int Server::Start() {
 Server::Server() {
 	thread = 0;
 	thread_running = 0;
-	railways.SetSize(200, 200);
+	railways.SetSize(64, 32);
 	status_text = "init server";
 	mode = SMODE_STARTUP;
 	data_reset.mr_idx = -1;
diff --git a/webinterface/gui/guidebug.js b/webinterface/gui/guidebug.js
index b061b61..265064b 100644
--- a/webinterface/gui/guidebug.js
+++ b/webinterface/gui/guidebug.js
@@ -1,9 +1,11 @@
 
 function debug (t) {
-    var pre = document.getElementById("debug");
+
+	var pre = document.getElementById("debug");
 	var div = document.getElementById("debug_div");
 	
-    if (pre)  pre.innerHTML = pre.innerHTML + "<br>" + t;
+	if (pre)  pre.innerHTML = pre.innerHTML + "<br>" + t;
 	if (div)  div.scrollTop = div.scrollHeight;
+
 };
 
diff --git a/webinterface/layout.css b/webinterface/layout.css
index 2b165a5..8ba438f 100644
--- a/webinterface/layout.css
+++ b/webinterface/layout.css
@@ -1,13 +1,13 @@
 
 body {
 	margin: 0px;
-    font-family: system-ui;
+	font-family: system-ui;
 }
 
 :root {
 	--top-height: 34px;
 	--side-width: 37px;
-	--bottom-height: 2px;
+	--bottom-height: 100px;
 	--menu-bg-color: #333;
 	--menu-fg-color: linen;
 
diff --git a/z21emu/atmega16_detect/gleiserkennung-v3.c b/z21emu/atmega16_detect/gleiserkennung-v3.c
index b4cb03e..3f1a482 100644
--- a/z21emu/atmega16_detect/gleiserkennung-v3.c
+++ b/z21emu/atmega16_detect/gleiserkennung-v3.c
@@ -281,4 +281,3 @@ int main( void ) {
     return 0;
 };
 
-
diff --git a/z21emu/atmega32_detect/Makefile b/z21emu/atmega32_detect/Makefile
new file mode 100644
index 0000000..bd50d5e
--- /dev/null
+++ b/z21emu/atmega32_detect/Makefile
@@ -0,0 +1,41 @@
+# .SILENT:
+
+# Atmega88
+# CFLAGS= -Os -g -Wall -mmcu=atmega16 -DF_CPU=8000000UL
+# LDFLAGS= -mmcu=atmega16
+
+CPUTYPE1= atmega32
+CPUTYPE2= m32
+
+# Atmega32
+CFLAGS= -Os -g -Wall -mmcu=$(CPUTYPE1) -DF_CPU=16000000UL
+LDFLAGS= -mmcu=$(CPUTYPE1)
+
+all: gleiserkennung-v4.bin
+
+%.o: %.c
+	avr-gcc $(CFLAGS) -c -o $@ $^
+
+rebuild: clean all
+
+gleiserkennung-v4.elf: gleiserkennung-v4.o eprom.o
+	avr-gcc $^ -o $@ $(LDFLAGS)
+
+
+%.bin: %.elf
+	avr-objcopy -j .text -j .data -O binary $^ $@
+
+clean:
+	rm *.o -rf
+	rm *.bin -rf
+	rm *.elf -rf
+	rm *~ -rf
+
+cleanall: clean
+
+source: cleanall
+
+upload-v4: gleiserkennung-v4.bin
+	avrdude -c avrispmkII -P usb -p $(CPUTYPE2) -v -V -U flash:w:gleiserkennung-v4.bin:r
+
+
diff --git a/z21emu/atmega32_detect/eprom.c b/z21emu/atmega32_detect/eprom.c
new file mode 100644
index 0000000..f1913af
--- /dev/null
+++ b/z21emu/atmega32_detect/eprom.c
@@ -0,0 +1,26 @@
+/*
+ * eprom.c
+ *
+ *  Created on: 11.02.2018
+ *      Author: steffen
+ */
+
+
+#include "eprom.h"
+
+void EEPROM_write(unsigned int uiAddress, unsigned char ucData) {
+	while(EECR & (1<<EEWE));		// Wait for completion of previous write
+	EEAR = uiAddress;				// Set up address and data registers
+	EEDR = ucData;
+	EECR |= (1<<EEMWE);				// Write logical one to EEMWE
+	EECR |= (1<<EEWE);				// Start eeprom write by setting EEWE
+}
+
+
+unsigned char EEPROM_read(unsigned int uiAddress) {
+	while(EECR & (1<<EEWE));		// Wait for completion of previous write
+	EEAR = uiAddress;				// Set up address register
+	EECR |= (1<<EERE);				// Start eeprom read by writing EERE
+	return EEDR;					// return eeprom data register
+}
+
diff --git a/z21emu/atmega32_detect/eprom.h b/z21emu/atmega32_detect/eprom.h
new file mode 100644
index 0000000..1cf1d17
--- /dev/null
+++ b/z21emu/atmega32_detect/eprom.h
@@ -0,0 +1,18 @@
+/*
+ * eprom.h
+ *
+ *  Created on: 11.02.2018
+ *      Author: steffen
+ */
+
+#ifndef EPROM_H_
+#define EPROM_H_
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void EEPROM_write(unsigned int uiAddress, unsigned char ucData);
+unsigned char EEPROM_read(unsigned int uiAddress);
+
+
+#endif /* ATMEGA8_DETECT_EPROM_H_ */
diff --git a/z21emu/atmega32_detect/gleiserkennung-v4.c b/z21emu/atmega32_detect/gleiserkennung-v4.c
new file mode 100644
index 0000000..5d124f3
--- /dev/null
+++ b/z21emu/atmega32_detect/gleiserkennung-v4.c
@@ -0,0 +1,281 @@
+/******************************************************************
+
+ * reads some digital inputs and make them readable over i2c bus.
+ *
+ *                         Atmega 32
+ *                         +-------+
+ *  S17      (XCK/T0) PB0 -|1  O 40|- PA0 (ADC0) S9
+ *  S18          (T1) PB1 -|2    39|- PA1 (ADC1) S10
+ *  S19   (INT2/AIN0) PB2 -|3    38|- PA2 (ADC2) S11
+ *  S20    (OC0/AIN1) PB3 -|4    37|- PA3 (ADC3) S12
+ *  S21          (SS) PB4 -|5    36|- PA4 (ADC4) S13
+ *  S22        (MOSI) PB5 -|6    35|- PA5 (ADC5) S14
+ *  S23        (MISO) PB6 -|7    34|- PA6 (ADC6) S15
+ *  S24         (SCK) PB7 -|8    33|- PA7 (ADC7) S16
+ *                  RESET -|9    32|- AREF
+ *                    VCC -|10   31|- GND
+ *                    GND -|11   30|- AVCC
+ *                  XTAL2 -|12   29|- PC7 (TOSC2)
+ *                  XTAL1 -|13   28|- PC6 (TOSC1)
+ *  S1          (RXD) PD0 -|14   27|- PC5 (TDI)
+ *  S2          (TXD) PD1 -|15   26|- PC4 (TDO)
+ *  S3         (INT0) PD2 -|16   25|- PC3 (TMS)
+ *  S4         (INT1) PD3 -|17   24|- PC2 (TCK)
+ *  S5         (OC1B) PD4 -|18   23|- PC1 (DSA)   I2C
+ *  S6         (OC1A) PD5 -|19   22|- PC0 (SCL)   I2C
+ *  S7         (ICP1) PD6 -|20   21|- PD7 (OC2)   S8
+ *                         +-------+ */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <util/delay.h>
+#include <util/twi.h>
+
+#include "eprom.h"
+
+#define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA);
+#define TWCR_NACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)
+#define TWCR_RESET TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(1<<TWSTO);  
+
+#define I2C_NUM_REGS 8
+#define I2C_DEFAULT_ADDR 0x2F
+#define VERSION 4
+
+#define I2C_SREGS_OFFSET 0x20
+
+enum {
+	I2C_SREG_VERSION = 0,
+	I2C_SREG_CMD,
+	I2C_SREG_ADDR,
+	I2C_SREG_DIOFFDELAY,
+
+	I2C_SREG_MAX
+};
+
+enum {
+	I2C_CMD_NONE = 0,
+	I2C_CMD_EEPROMREAD,
+	I2C_CMD_EEPROMWRITE
+};
+
+volatile uint8_t i2c_reg;
+volatile uint8_t i2c_system[I2C_SREG_MAX];
+volatile uint8_t i2c_regs[I2C_NUM_REGS];
+
+//
+// i2c slave addresse festlegen und interrupts einschalten
+void i2c_slave_init(uint8_t adr) {
+	int i;
+	
+	for (i = 0; i < I2C_NUM_REGS; i++)  {
+		i2c_regs[i] = 0;
+	}
+	
+	TWAR = adr << 1;
+	TWCR &= ~(1<<TWSTA) | (1<<TWSTO);
+	TWCR |= (1<<TWEA) | (1<<TWEN) | (1<<TWIE);
+
+	i2c_reg = 0x0;
+	
+	sei();
+}
+
+ISR (TWI_vect) {
+	char data=0;
+
+	switch (TW_STATUS) {
+		case TW_SR_SLA_ACK: // 0x60 Slave Receiver, Slave wurde adressiert	
+			TWCR_ACK;
+			i2c_reg=0xFF;
+			break;
+
+		case TW_SR_DATA_ACK: // 0x80 Slave Receiver, ein Datenbyte wurde empfangen
+			data=TWDR;
+			if (i2c_reg == 0xFF) {
+				if(data < I2C_NUM_REGS || (data >= I2C_SREGS_OFFSET && data < I2C_SREGS_OFFSET+I2C_SREG_MAX)) {
+					i2c_reg = data;
+					TWCR_ACK;
+				}
+				else 
+					TWCR_NACK;
+			}
+			else {
+				if(i2c_reg < I2C_NUM_REGS) {
+					i2c_regs[i2c_reg] = data;
+					i2c_reg++;
+					TWCR_ACK;
+				}
+				else if (i2c_reg >= I2C_SREGS_OFFSET && i2c_reg < I2C_SREGS_OFFSET+I2C_SREG_MAX) {
+					i2c_system[i2c_reg-I2C_SREGS_OFFSET] = data;
+					i2c_reg++;
+					TWCR_ACK;
+				}
+				else TWCR_NACK;
+			}
+			break;
+
+		case TW_ST_SLA_ACK:  //0xA8 Slave wurde im Lesemodus adressiert und hat ein ACK zurückgegeben.
+		case TW_ST_DATA_ACK: //0xB8 Slave Transmitter, Daten wurden angefordert
+			if (i2c_reg == 0xFF) {
+				i2c_reg = 0;
+			}	
+			if (i2c_reg < I2C_NUM_REGS) {
+				TWDR = i2c_regs[i2c_reg];
+				i2c_reg++;
+				TWCR_ACK;
+			}
+			else if (i2c_reg >= I2C_SREGS_OFFSET && i2c_reg < I2C_SREGS_OFFSET+I2C_SREG_MAX) {
+				TWDR = i2c_system[i2c_reg-I2C_SREGS_OFFSET];
+				i2c_reg++;
+				TWCR_ACK;
+			}
+			else TWCR_NACK;
+			break;
+	
+		case TW_SR_STOP:
+			TWCR_ACK;
+	        break;
+
+		case TW_ST_DATA_NACK: // 0xC0 Keine Daten mehr gefordert 
+		case TW_SR_DATA_NACK: // 0x88 
+		case TW_ST_LAST_DATA: // 0xC8  Last data byte in TWDR has been transmitted (TWEA = “0”); ACK has been received
+		default: 	
+		    TWCR_RESET;
+			break;
+	}
+}
+
+/////////////////////////////////////////////////////////////////////////
+// 
+
+int main( void ) {
+	uint32_t cnt[32] = { 0 };
+	unsigned int i;
+	uint32_t inval = 0;
+	uint32_t temp = 0;
+	int offdelay;
+
+	//
+	// disable JTAG
+	MCUCSR |= (1<<JTD);
+	MCUCSR |= (1<<JTD);
+
+	// enable inputs
+	DDRA = 0;
+	PORTA = 0xFF;
+	DDRB = 0;
+	PORTB = 0xFF;
+	DDRC = 0;
+	PORTC = 0xFF;
+	DDRD = 0;
+	PORTD = 0xFF;
+
+	//
+	// read all variables from eeprom
+	i2c_system[I2C_SREG_VERSION] = VERSION;
+	i2c_system[I2C_SREG_CMD] = 0;
+
+	i2c_system[I2C_SREG_ADDR] = EEPROM_read(I2C_SREG_ADDR);
+	if (i2c_system[I2C_SREG_ADDR] > 0x4f || i2c_system[I2C_SREG_ADDR] < 0x20) {
+		i2c_system[I2C_SREG_ADDR] = I2C_DEFAULT_ADDR;
+	}
+
+	i2c_system[I2C_SREG_DIOFFDELAY] = EEPROM_read(I2C_SREG_DIOFFDELAY);
+	if (i2c_system[I2C_SREG_DIOFFDELAY] == 0 || i2c_system[I2C_SREG_DIOFFDELAY] == 0xFF) {
+		i2c_system[I2C_SREG_DIOFFDELAY] = 0x20;
+	}
+
+	i2c_slave_init (i2c_system[I2C_SREG_ADDR]);
+
+	for (i = 0; i < 32; i++) cnt[i] = 0;
+
+	//
+	// system loop
+    while( 1 ) {
+    	//
+    	// digital in registers..
+    	offdelay = i2c_system[I2C_SREG_DIOFFDELAY] << 8;
+
+		//  S1 - S8
+    	i = 0; if (!(PINC & (1 << 0))) cnt[i] = offdelay;
+    	i++; if (!(PINC & (1 << 1))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 2))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 3))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 4))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 5))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 6))) cnt[i] = offdelay;
+		i++; if (!(PINC & (1 << 7))) cnt[i] = offdelay;
+
+		//  S9 - S16
+		i++; if (!(PINA & (1 << 0))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 1))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 2))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 3))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 4))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 5))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 6))) cnt[i] = offdelay;
+		i++; if (!(PINA & (1 << 7))) cnt[i] = offdelay;
+
+		//  S17 - S24
+		i++; if (!(PIND & (1 << 0))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 1))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 2))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 3))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 4))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 5))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 6))) cnt[i] = offdelay;
+		i++; if (!(PIND & (1 << 7))) cnt[i] = offdelay;
+
+    	// all values
+		for (i = 0; i < 16; i++) {
+			if (cnt[i] == 0) inval &= ~(1 << (i));
+			else {
+				cnt[i]--;
+				inval |= (1 << (i));
+			}
+		}
+
+		for (i = 0; i < 16; i++) {
+			if (cnt[16+i] == 0) temp &= ~(1 << (i));
+			else {
+				cnt[16+i]--;
+				temp |= (1 << (i));
+			}
+		}
+
+		i2c_regs[0] = (unsigned char) (inval & 0x000000FF);
+		i2c_regs[1] = (unsigned char) ((inval & 0x0000FF00) >> 8);
+		i2c_regs[2] = (unsigned char) (temp & 0x000000FF);
+		i2c_regs[3] = (unsigned char) ((temp & 0x0000FF00) >> 8);
+
+
+		//
+		// system registers
+		if (i2c_system[I2C_SREG_CMD] != 0) {
+			if (i2c_system[I2C_SREG_CMD] == I2C_CMD_EEPROMREAD) {
+				cli();
+				i2c_system[I2C_SREG_CMD] = 0;
+				for (i = 0; i < I2C_SREG_MAX; i++) {
+					i2c_system[i] = EEPROM_read(i);
+				}
+				sei();
+			}
+
+			if (i2c_system[I2C_SREG_CMD] == I2C_CMD_EEPROMWRITE) {
+				cli();
+				i2c_system[I2C_SREG_CMD] = 0;
+				for (i = 0; i < I2C_SREG_MAX; i++) {
+					EEPROM_write(i, i2c_system[i]);
+				}
+				sei();
+			}
+		}
+		i2c_system[I2C_SREG_CMD] = 0;
+    }
+    return 0;
+};
+
+
diff --git a/z21emu/config.h b/z21emu/config.h
deleted file mode 100644
index 31da638..0000000
--- a/z21emu/config.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef _CONFIG_H_
-#define _CONFIG_H_
-
-#define VERSION "0.1"
-
-#define PREFIX "/usr/local"
-#define RUNPID "/var/run/z21Emulation.pid"
-#define DATAPREFIX "/var/lib"
-#define ETCPREFIX "/etc"
-
-#define DEFAULT_Z21PORT 21104
-
-
-#endif
diff --git a/z21emu/z21emu.cc b/z21emu/z21emu.cc
index 4917102..e9ddefd 100644
--- a/z21emu/z21emu.cc
+++ b/z21emu/z21emu.cc
@@ -141,7 +141,7 @@ void i2cscan(I2C *i2c) {
 					docnt++;
 				}
 			}
-			else if (ver == 3) {
+			else if (ver == 3 || ver == 4) {
 				if (dicnt < RBUS_MAXSENSORBYTES) {
 					rbus[dicnt].i2c_addr = addr;
 					rbus[dicnt].i2c_reg = 0x0;
@@ -194,7 +194,6 @@ int i2ccfgload(const char *fname) {
     FILE *f;
     char buf[1024];
     char *pos;
-    int tmp;
     int index = -1;
     int type;
     int addr;