Hardware is… Hard. Changing it is a big deal. It has mass!
Software is… Soft. It goes away when you turn the power off, and it’s modified at runtime. It weighs nothing, changes “instantly”.
Firmware is neither and both. It’s stored in hardware (EPROM, EEPROM, Flash, …) that you can take out and insert.
The metaphor is around temporality and physicality.
Sorry, pedant nerd.
At the time EEPROMs were becoming common, core memory was still common enough. Core was great! Power fail circuitry caused registers to save and the whole machine state was remembered.
Firmware is a metaphor, not an analogy.
Hardware is… Hard. Changing it is a big deal. It has mass!
Software is… Soft. It goes away when you turn the power off, and it’s modified at runtime. It weighs nothing, changes “instantly”.
Firmware is neither and both. It’s stored in hardware (EPROM, EEPROM, Flash, …) that you can take out and insert.
The metaphor is around temporality and physicality.
Sorry, pedant nerd.
At the time EEPROMs were becoming common, core memory was still common enough. Core was great! Power fail circuitry caused registers to save and the whole machine state was remembered.