based on the System/360 architecture. The RCA1802 8-bit CPU, introduced in 1976, was the first serially-produced radiation-hardened microprocessor. PIC 1886VE, Russian 50 MHz microcontroller designed by Milandr and manufactured by Sitronics-Mikron on 180 nm bulk-silicon technology. m68k based: The Coldfire M5208 used by General Dynamics is a low power (1.5 W) radiation hardened alternative. MIL-STD-1750A based: The RH1750 manufactured by GEC-Plessey. The Proton 100k SBC by Space Micro Inc., introduced in 2003, uses an updated voting scheme called TTMR which mitigates single event upset (SEU) in a single processor. The processor is Equator BSP-15. The Proton200k SBC by Space Micro Inc, introduced in 2004, mitigates SEU with its patented time triple modular redundancy (TTMR) technology, and single event function interrupts (SEFI) with H-Core technology. The processor is the high speed Texas Instruments 320C6Xx series digital signal processor. The Proton200k operates at 4000 MIPS while mitigating SEU. MIPS based: The RH32 is produced by Honeywell Aerospace. The Mongoose-V used by NASA is a 32-bit microprocessor for spacecraft onboard computer applications (i. e. New Horizons). The KOMDIV-32 is a 32-bit microprocessor, compatible with MIPS R3000, developed by NIISI, manufactured by Kurchatov Institute, Russia. PowerPC based: The RAD6000 single-board computer (SBC), produced by BAE Systems, includes a rad-hard POWER1 CPU. The RHPPC is produced by Honeywell Aerospace. Based on hardened PowerPC 603e. The SP0 and SP0-S are produced by Aitech Defense Systems is a 3U cPCI SBC which utilizes the SOI PowerQUICC-III MPC8548E, PowerPC e500 based, capable of processing speeds ranging from 833 MHz to 1.18 GHz. The Proton400k SBC by Space Micro Inc., a Freescale P2020 cpu based on PowerPC e500. The RAD750 SBC, also produced by BAE Systems, and based on the PowerPC 750 processor, is the successor to the RAD6000. The SCS750 built by Maxwell Technologies, which votes three PowerPC 750 cores against each other to mitigate radiation effects. Seven of those are used by the Gaia spacecraft. The Boeing Company, through its Satellite Development Center, produces a radiation hardened space computer variant based on the PowerPC 750. The BRE440 by Broad Reach Engineering. IBM PPC440 core based system-on-a-chip, 266 MIPS, PCI, 2x Ethernet, 2x UARTS, DMA controller, L1/L2 cache Broad Reach Engineering Website The RAD5500 processor, is the successor to the RAD750 based on the PowerPC e5500. SPARC based: The ERC32 and LEON 2, 3, 4 and 5 are radiation hardened processors designed by Gaisler Research and the European