the advantage of binary: it's easy to be separated, even if som ele tric noise nearby.

The 32 bits way to store number: 1 for the sign; 2~9 for the exponent, the remaining for the significand

A + B + C -> carry bit & sum bit (1st. use half adder table; 2nd. sum and C to half adder table; 3rd. two carry to OR, the last sum is the sum.)

A + B -> carry bit & sum bit (XOR and AND)

RAM(random access memory): AND-OR latch(the reset wire is used to set if the gated should be opened, which doesn't show in this picture)

for 256 store bit, we only need 35 wire with matrix to control it: 1 write wire, 1 set wire, 1 read wire, 16 wire for conlunms and rows.

decode phase——find the resistor through operation(first four bit for operation, last four bit for address)

cache can store a quare of datas, which can decrease Cache Missing time(request for datas from RAM)

dirty bit: Before the cache erease the old clock to free up space, it will check dirty bit. If it's dirty, the old block data is written back to RAM before loading in the new block.

You can use different part of CPU at the same time, but there are some dangers, for example, when we had to stop it and get a value, maybe it is a old value. We can use Out-of-Order Excution to solve it.

Trouble: it may take a long time to determine which road should it go, but we can write some program to guess the road. Now the probility of correct is more than 90%.