# June 2023 Notes

## Saturday 17 June 2023

Videos #3 to #8

Topics covered- Boolean logic (AND, OR, NOT and XOR) and gates - used in the creation of circuits to determine input and output
- Computation - running query through a model with predictable outcomes
- 64 bit required to handle sums involving the US national debt
- Long term memory enabled by creating configurations of inputs and gates that always yield the same result (0 or 1)
- Logic abstracted at higher and higher levels
- Clock speed: number of cycles (reads) measured in Hz
- Code runs through series of instructions located in memory addresses
- Address contain operations (operating codes) e.g. add, subtract, jump, halt …
- Instructions and data both in memory and go via the Control Unit
- Actions taken on values in registries
- Arithmetic Logic Unit (ALU) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers

- State is a model in a certain configuration. It is essentially fixed (memory cannot grow)
- 0s and 1s are fixed and represented by a set of boolean operations (gates)
- State can be changed (from read only to writable) by changing the state of a latch which then allows gates to reopen (or close)
- The brain is also a (relatively) fixed structure. A memory is similar to repeating a question to an LLM
- The response may be more or less fixed (low temperature comparable to a calculator summing 2 and 2) depending on complexity, frequency, etc.
- Brain physical and subject to change: deterioration (age or illness), damage, use (repeated recall, common tasks like simple maths, everyday language)