Argentine War of Independence Chile, allied with the Mapuches. On April 4, Argentine Colonel Juan Gregorio de Las Heras had occupied Concepción, but the Royalists retreated to Talcahuano. In early 1818, Royalist reinforcements from the Viceroyalty of Peru arrived, commanded by general Mariano Osorio, and advanced towards the capital. San Martín then turned to scorched earth tactics and ordered the evacuation of Concepción, which he thought was impossible to defend. On 18 February 1818, the first anniversary of the battle of Chacabuco, Chile declared its independence from the Spanish Crown. On March 18, 1818, Osorio led a surprise attack on the joint Argentine-Chilean army,
AN/GYK-12 has a "privilege level", which controls the operations it is allowed to perform. Level '00'b is used for non-privileged programs. Level '01'b programs are "semi-privileged". Level '10'b programs are privileged and can execute all instructions and I/O operations. Level '11'b is unused. The system uses Sylvania Universal High Level II Integrated Circuits (SUHL II), manufactured by Collins Radio, Honeywell, Raytheon and Motorola Semi-Conductor Division. AN/GYK-12 The AN/GYK-12 is an obsolete 32-bit minicomputer developed by Litton Industries for the United States Army. The AN/GYK-12 is a militarized version of the L-3050 computer ruggedized for use in the TACFIRE tactical fire direction