Ken Shirriff

You can find Ken on Twitter at twitter.com/kenshirriff and his blog righto.com.- Soyuz blog post:    http://www.righto.com/2020/01/inside-digital-clock-from-soyuz.html- IBM System/370: https://en.wikipedia.org/wiki/IBM_System/370- Amdahl: https://en.wikipedia.org/wiki/Amdahl_Corporation- Build Your Own Z80 Computer:    https://books.google.com/books?id=mVQnFgWzX0AC&pg=PA1#v=onepage&q&f=false- Euler: https://en.wikipedia.org/wiki/Leonhard_Euler- Commodore PET: https://en.wikipedia.org/wiki/Commodore_PET- TRS-80 (Trash-80): https://en.wikipedia.org/wiki/TRS-80 https://techland.time.com/2012/08/03/trs-80/- Visual 6502: http://www.visual6502.org/- MOS 6502: https://en.wikipedia.org/wiki/MOS_Technology_6502- Metallurgy microscope: https://www.amscope.com/compound-microscopes/metallurgical-microscopes.html- AM2900: https://en.wikipedia.org/wiki/AMD_Am2900- MOS transistor: https://en.wikipedia.org/wiki/MOSFET- Cray-1: https://en.wikipedia.org/wiki/Cray-1- Intel 4004: https://en.wikipedia.org/wiki/Intel_4004- Datapoint 2200: https://en.wikipedia.org/wiki/Datapoint_2200- Intel 8008: https://en.wikipedia.org/wiki/Intel_8008- Endianness: https://en.wikipedia.org/wiki/Endianness- TTL chips: https://en.wikipedia.org/wiki/Transistor%E2%80%93transistor_logic- Big Endian and Little Endian:    https://chortle.ccsu.edu/AssemblyTutorial/Chapter-15/ass15_3.html- Xerox Alto: https://en.wikipedia.org/wiki/Xerox_Alto- Charles Simonyi: https://en.wikipedia.org/wiki/Charles_Simonyi- Punched cards: https://en.wikipedia.org/wiki/Punched_card- Why did line printers have 132 columns?:    https://retrocomputing.stackexchange.com/questions/7838/why-did-line-printers-have-132-columns- Teletype 33: https://en.wikipedia.org/wiki/Teletype_Model_33- Analogue computer: https://en.wikipedia.org/wiki/Analog_computer- Analogue computer thread: https://twitter.com/kenshirriff/status/1223675683387265024- Differential analyser: https://en.wikipedia.org/wiki/Differential_analyser- Bitcoin mining on a 1401:    http://www.righto.com/2015/05/bitcoin-mining-on-55-year-old-ibm-1401.html- Mining bitcoin with pencil and paper: https://www.youtube.com/watch?v=y3dqhixzGVo- Bitcoin mining on a Xerox Alto:    http://www.righto.com/2017/07/bitcoin-mining-on-vintage-xerox-alto.html- Bitcoin mining on the Apollo Guidance computer:    http://www.righto.com/2019/07/bitcoin-mining-on-apollo-guidance.html- Colossus computer: https://en.wikipedia.org/wiki/Colossus_computer- Accounting machine: https://en.wikipedia.org/wiki/Accounting_machine- Memory phosphor: https://www.britannica.com/science/memory-phosphor- Rowhammer: https://en.wikipedia.org/wiki/Row_hammer- Core memory: https://en.wikipedia.org/wiki/Magnetic-core_memory- Williams tube: https://en.wikipedia.org/wiki/Williams_tube- Core rope memory: https://en.wikipedia.org/wiki/Core_rope_memory- Honeywell 800: https://people.cs.clemson.edu/~mark/h800.html- Honeywell 1800: https://www.computerhistory.org/brochures/doc-4372956da1170/    http://ed-thelen.org/comp-hist/BRL64-h.html#HONEYWELL-1800- SPARC delayed branching:    https://arcb.csc.ncsu.edu/~mueller/codeopt/codeopt00/notes/delaybra.html- IBM 360 Model 50: https://en.wikipedia.org/wiki/IBM_System/360_Model_50- RR Auction: https://www.rrauction.com/