Memory chips from the old to the new.

Please visit the PCB pages, where I have photos of complete memory PCB boards 500x500mm in size!

Please note: Most of this is not part of my collection, and none is for sale. (I just took photos! :)

Ferrite bead RAM memory

The above image is a magnification of the ferrite memory cells contained on the following pictured PCBs, there are thousands of these all cross wired with fine enamelled copper wire, and access controller chips around the circumference of the PCB.

This is an older RAM module.

This PCB measures 254x203mm and contains 5 rows of 8 banks each, total 32 on this PCB (The right hand row does not have any banks). Each of the 32 cells contains 12x8 lines crossing through each ferrite bead, which stores a single bit of information. Can you work out the total size of this memory PCB ?

Silicon based memory

What an old RAM chip looked like, roughly actual size.

And the core photomicograph of a Stanford 6k S-RAM chip, magnified by... alot !

An old large memory module, and the small wafer of cores on top.

An old memory module of yesteryear

Discrete memory chips above.

The following is a small example of memory cards for mostly x86 based personal computers

87x24mm OKI JAPAN 9A92 Single sided RAM
M514256-10R
89132209

88x21mm "T" unknown 256k memory SIMM RAM
USA 9014 NCK
TC514256AJ-80

89x17mm "HEI" unknown RAM
HY514400A
J-20 9421B KOREA

88x17mm Texas Instruments RAM
TM 4256GU9
Made in U.S.A

89x12mm Hitachi (?) Single sided RAM
HY514400A
J-70 9421B KOREA

88x18mm unknown Single sided RAM
AMT 9440HBT
TM514400AJ-70

88x17mm Texas Instruments RAM
TM 4256GU9
Made in U.S.A

89x20mm NEC (?) RAM
424260-80
9312EU022

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

89x20mm (various brands x3) RAM
TMS 441000J & TMS44100DJ &
"MT" 4C1024DJ

103x33mm Mitsubishi Double sided RAM
MH1M72BJ-8
JAPAN 3205A03
PC68N9CA-B

109x33mm Samsung Double sided RAM
KMM5724000AG-8
KOREA 509Y