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  1. Hi I'm working with Papilio DUO, Papilio DesignLab 1.0.8 and ZPUino SOft Processor Vanilla v2.0. I'm just testing how much RAM I can use in my sketch. For this reason I increase the size of an array (unsigned char). The sketch below with an array size of 501*1024 bytes is not running. The same sketch with an array size of 500*1024 is working fine. static unsigned char bufferRAM[501*1024]; void setup(){ pinMode(13, OUTPUT); Serial.begin(115200); } void loop(){ digitalWrite(13, HIGH); delay(100); digitalWrite(13, LOW); delay(100); Serial.print(bufferRAM[0]); Serial.println("Hello..."); } Compiler output: Binary sketch size: 515.216 bytes (of a 2.048.000 byte maximum) - 1.728 bytes ROM, 513.640 bytes memory, 25% used Der Sketch verwendet 1.576 Bytes (0%) des Programmspeicherplatzes. Das Maximum sind 2.048.000 Bytes. Globale Variablen verwenden 152 Bytes des dynamischen Speichers. What can be the reason? The Papilio DUO Hardware Guide website says: The ZPUino Soft Processor integrates the SRAM which gives your ZPUino sketches 512KB or 2MByte of code space! Thank you for your help!