On Tuesday, September 3, 2019, 03:18:40 AM PDT, \0xDynamite <[email protected]> wrote: >The reason I asked because I can't figure out how you can get persistent memory without burning circuits. An internal battery perhaps or a writable crystal, but.... how?
In the early 1970's, the computer industry went from magnetic core ( https://en.wikipedia.org/wiki/Magnetic-core_memory ) to static and dynamic RAM, losing non-volatility in the process. It was possible to run a CMOS static RAM on a tiny battery, to maintain data when the main system power was turned off. The industry developed UV-erasable EPROM as a substitute, which allowed only the erasure of the entire memory chip, , and some early EEPROM. (Electrically erasable programmable Read-Only-Memory).Eventually "flash-EPROM" was developed. https://en.wikipedia.org/wiki/Flash_memory Jim Bell
