为什么CPU叫8085呢？

8085这个名字的由来还是很有逻辑的：The naming of microprocessor indicates historical facts 
blended with technology improvements.1)The microprocessor came in the late 70s(1976).This was close 
to 80.so from here 1ST TWO DIGITS were taken.

 微处理器是在70年代末发明的。
接近80年，所以，前两个数字就是这么来的 
2)There are 8 bits in microprocessor.Hence the 3RD DIGIT 
was tkaen as 8.

 当时微处理器是8位的，因此，第3个数字是8 
3)Before 8085,8086 the CPU of intel corporation was 8080A 
which were requiring +5V,-5V and +12V for functioning.
With the advancement in technology, it was possible to run 
the microprocessor with single +5V.Hence the LAST DIGIT 
were taken as 5.
在8085和8086 cpu之前，8080a处理器是需要+5-5和12v电压来工作。
随着技术的进步，只需要单一的5v供电了，因此，最后一个数字是5

This was the hidden message behind 8085,(year)(bits)(supply voltage)80    8          58086的命名跟8085不大一样，名字的命名方式有点随性，貌似没有什么逻辑：

When Intel made the first 4 bit microprocessor, it was called the 4004. At the time, they did not realize it was a microprocessor, they were just making a custom integrated circuit for a handheld electronic calculator.
当intel发明第一颗4位的位处理器的时候，intel把他叫4004.在当时，intel也没有意识到这就是微处理器，（估计微处理器是现在人启名字），intel当时只是给做手持计算器的厂家来定制处理器。

The instruction set on the 4004 was quite limited; an upgraded version was numbered 4040 by reversing the last two digits. By now, they realized the power of a programmable microprocessor. When they made 8 bit processors, the double wide 4004 was the 8008, and the double wide 4040 was the 8080. The 8085 was the 5 volt only version of the 8080.
因为4004的指令集很有限，所以又搞出来了一个升级版本4040.
8008是4004的8位版，8080是4040的8位版。
8085是8080的单5伏电压版

When Intel made an upgraded 8085 into a 16 bit processor, the next number was 8086. They liked this, as it seemed to fit the 16 bit nature. The 8088 was an 8086 with an 8 bit data bus for fewer pins on the package, and I think the 8087 was a math coprocessor (things are starting to get fuzzy, this was quite a few years ago). Note that there is no law requiring any particular numbering scheme, it is not unusual to skip numbers or make up new numbers that seem to have some kind of meaning.
8085升级到16位后，就叫8086了

Later they went with a new generation 80186, then 80286, then 80386 and I think, 80486. They dropped the "80" in front somewhere along the way, it was common to call a microprocessor a 386SX or 486. Then, they pretty much dumped the numbers entirely, because other companies were using them. Making up names like Pentium for the 586 means they could trademark them and prevent others from using them.