Interesting die shots

[Chiefish]

I was bored tonight and decided to take out my microscope to look at some die shots pf some of the old Intel eproms I have and discovered that a 1701 grey and a 1702 grey have the exact sme markings on them . I also have an early grey 1702a and took a look at that die and heres what I found. What is the difference between the 1701 and the 1702 , or does anyone know any visible differences between the two to look for? the last shot is of a 1702a grey,Just for the hell of it I also looked at a Micro Intl 1701 i have.

[Chiefish]

heres the shot of the Micro Int 1701, and a c1702a

[CPUShack]

The four devices 1601, 1602, 1701, and 1702 use identical chips. The 1601 and 1701 is operable in both
the static and dynamic mode while the 1602 and 1702 is operable in the static mode only.

In the beginning of 1970 the market needs for this chip was enormous but the yield of the first 1702
production was very poor. On each functional chip there were hundreds of unusable chips. After
modification of chip architecture from parallel in serial design and including the Walkout (put the chips
under high negative voltage) into the manufacturing process the production yield suddenly increased to 60
chips per wafer. After modification of this production process the chip was marked 1702A

[dume]

Interesting.
Great pics.