1750A - 1750A The 1750A is not a particular computer, but a family of compatible computers that implement the instruction set described by the military standard document MIL-STD-1750A, (1980). The computers have been constructed by many methods, by a wide variety of companies. Traditionally, 1750s run aircraft, missiles or parts thereof. They are usually programmed in JOVIAL, a high-level programming language similar to Algol. The U.S. Air Force defined the standard in order to reduce the costs of software and computer systems for aircraft and missiles. The 1750 usually has a 16-bit bus, and 216 16-bit words of memory. The standard defines an optional memory management unit that allows 220 16-bit words of memory using 512 page mapping registers (in the I/O space), defining separate instruction and data.
JOVIAL programming language - It was developed to write software for the electronics of military aircraft. In the late 1970s and early 1980s, the U.S. military adopted a standardized CPU, the 1750A, and JOVIAL normally produces programs for that processor. JOVIAL is MIL-STD-1589, and is still widely used to update and maintain software on older, obsolescent military vehicles and aircraft. There are three dialects in common use: J3, J3B-2, and J73. As of 2003, JOVIAL is still actively maintained and distributed by the USAF JOVIAL Integrated Tool Set (ITS) Program Office. The program office helps organizations reuse their old, reliable JOVIAL software by rehosting and retargeting the software to newer, more modern computer platforms and environments. The standard package (the "integrated tool set" or ITS) contains a compiler, a MIL-STD-1750A assembler, linker, and simulator/debugger. It.
Central processing unit - architecture DEC's PDP-11 architecture, and its successor, the VAX architecture Motorola's 68000 architecture Sun Microsystems's SPARC architecture MIPS Computer Systems Inc's MIPS architecture HP's PA-RISC architecture DEC's Alpha architecture The AIM Alliance's PowerPC architecture DEC and Acorn ARM's StrongARM architecture SuperH's SuperH architecture UNIVAC 1100/2200 series architecture (currently supported by Unisys ClearPath IX computers) 1750A, the U.S.'s military standard computer. AP-101, the space shuttle's computer Emerging new CPU architectures include: Intel's Itanium architecture AMD's x86-64 architecture Historically important CPUs have been: EDSAC- the first stored-program computer Apollo Guidance Computer, used in the moon flights The above processor architectures could also be characterized by their CPU design like register size. Today most desktop computers have 32-bit processors; 64-bit processors are being phased in. Smaller devices like mobile phones, PDAs, or portable video.
Clementine mission - by a single sensor cover. The spacecraft propulsion system consisted of a nonpropellant hydrazine system for attitude control and a bipropellant nitrogen tetraoxide and monomethyl hydrazine system for the maneuvers in space. The bipropellant system had a total capability of about 1900 m/s with about 550 m/s required for lunar insertion and 540 m/s for lunar departure. Attitude control was achieved with 12 small attitude control jets, two star tracker cameras, and two inertial measurement units. The spacecraft was three-axis stabilized in lunar orbit via reaction wheels with a precision of 0.05 Deg. in control and 0.03 Deg. in knowledge. Power was provided by gimbaled, single axis, GaAs/Ge solar panels which charged a 15 amp-hour, 47-w hr/Kg Nihau (Ni-H) common pressure vessel battery. Spacecraft data processing was performed using a MIL-STD-1750A.
