Alan Mantooth, Carl-Mikael Zetterling and Ana Rusu (28 April 2021) "The Radio We Could Send to Hell: Silicon carbide radio circuits can take the volcanic heat of Venus" IEEE Spectrum https://spectrum.ieee.org/semiconductors/materials/the-radio-we-could-send-… "The average surface temperature on Venus is 464 ?C, the atmosphere is dense with highly corrosive droplets of sulfuric acid, and the atmospheric pressure at the surface is about 90 times that of Earth." (Teflon melts at 327 ?C) The following thesis describes the Vulcan II chip mentioned a bit more Benavides Herrera, Maria Raquel, "An RS-485 Transceiver in a Silicon Carbide CMOS Process" (2018).Theses and Dissertations 3067 "The RS?485 was designed in a 1.2 ?m SiC CMOS process technology developed by Raytheon Systems Limited (UK) called High Temperature Silicon Carbide (HiTSiC?). The components available in this process include: NMOS and PMOS devices, on-chip resistors, diodes, and capacitors. The process key features are given below: ? 4H-SiC process ? N-type substrate ? Supply voltage of 15 V 5? Single metal layer, two layers of polysilicon (one being high sheet resistance poly) ? Operating temperatures greater than 300?C" ... --- In 1988's 1.2?m CMOS process the MIPS R3010 floating-point coprocessor was about 75,000 transistors on an ~8mm x 8mm die. Are there markets for SiC CMOS devices with large transistor counts? Watching Curious Marc's video mentioning Triton missile/Saturn V bit-serial computer implementations, reminded me of: Olof Kindgren (2019) Bit by bit - How to fit 8 RISC-V cores in a $38 FPGA board https://riscv.org/wp-content/uploads/2019/06/12.15-SERV-Zurich-Copy.pdf https://github.com/olofk/serv "SERV is an award-winning bit-serial RISC-V core" (RV32I) (Not an engineer - guessing) If process limits mean large SiC memories are unlikely, what other technologies would work in the 400?500?C temperature range? Magnetic bubble memory? Twistors if threading cores automatically remains infeasible? For cameras could you build vacuum tube sensors containing SiC devices if useful?