Pentium over drive prosesor Before opennig the package.

After openning the package, Pentium over drive prosesor.

Do you open the computer box? In the photo, Inside of computer. There is the CPU in the left of center. ( Can you see?).

This photo shows the microcomputer for the electric control system. Its core is Z80.

There are many kinds of CPU, which abbreviates the Central Processing Unit. Now, the majority of CPU is the series of Pentium. However, Z80, which is 8 bit CPU, has taken an active part in the electric appliances. Further, Z80 is the majorty of CPU for control systems in the factory.
[Histroy of the series for Intel CPU]

4bit CPU       8bit CPU                 16bit CPU                    32bit CPU
        |                 | Z80     |                             |                      
i4004 --|-  i8008 - i8080 -- i8085 -|- i8086 - i8086-2 -- i80286 -|- i80386 --------- 486 ---- Pentium  -- Pentium II
        |                           |                  |- i80186  |                    |-- Pentium OverDrive Prosessor
1971     1972   1974   1975   1977   1978                1982      1985  

 the outside view of Z80 

It was used the CPU in the series of NEC PC8000 in Japan.

Z80 of the 8bit CPU, which is developed by Zilog.

---

Dissolve the package

	Bore a hole in the center part of CPU.
	Dissolve the package by an acid during heating. This work is very dangerous!

Refernce: S. Katuma, "Jissen IC kaiseki Gijyutu semina",Transistor Technology(CQ Public) 1995,Aug - 1996,Jan.

---

Inside of Z80

	The main part is very small. There is the silicon wafer in the center. The electric circuit are printed here. There are bonding wires around the silicon wafer.
	Magnify the Z80 with the microscope, 40-power. The photo looks like the treasures in Shosoin. Careful observation shows that an patter was printed.
	Magnify the Z80 with the microscope, 100-power. The patters are more clearly. These patters have functions of the electric circuit.
	Magnify the part bonding of Z80 with the microscope, 40-power.
	Magnify the part bonding of Z80 with the microscope, 100-power. The part of bonding is clearly.

---

Show the inside of another LSI, like programable periphery input-output circuit 8255(PPI) and video control tip.

Magnify the 8255(PPI) with the microscope, 40-power.	Magnify the 8255 with the microscope, 100-power.
Magnify the video control tip with the microscope, 40-power.	Magnify the video control tip with the microscope, 100-power.
Magnify the one-tip microcomputer with the microscope, 40-power.	Magnify the bonding part of one-tip microcomputer with the microscope, 100-power.

Magnify the EP-ROM
inside of EP-ROM.

Magnify the EP-ROM with the microscope, 40-power.	Magnify the EP-ROM with the microscope, 40-power.
Magnify the EP-ROM with the microscope, 100-power.	Magnify the EP-ROM with the microscope, 100-power.

---

The package of Pentium Over Drive Prosessor was opened.

Make explorations of the inside Pentium Over Drive Prosessor

The outside appearance 

It was used as the brain for a personal computer.

32 bit CPU

---

Drill a hole in the package of CPU and Open it.

The opening package of Pentium Over Drive Prosessor

	The main part is larger than Z80. There is the silicon wafer in the center. It was sparkling. The electric circuit are printed here.
	Magnify the Pentium Over Drive Prosessor. There are double bonding wires around the silicon wafer. These patters have functions of the electric circuit.
	Magnify the part bonding of Pentium Over Drive Processor. The patters are more clearly in the silicon.

---

If you want to contact to the supporter of this page, send e-mail to the next address.
webmaster@itf.que.jp

Copyright(C) 1998-2001 by Itou Satoshi

Return Itou Homepage