2nd hand A4000 does not show Fast Mem. How come ?

[darkcoder]

are you sure about the jumper 852?
In your previous post you wrote it was set on 256k.

If you post the chip code and number of chips per SIMM we can tell the size of the SIMM.

[darkcoder]

I can't understand anything from the SIMM number you posted.
Are these the numbers written on the chips? I need the numbers on the chip themself, not the number written on the simm.

Anyway, since your 3rd 4000 has fast memory, have you tried to remove one working SIMM from the 3rd (which works for sure) and put it in the other ones? (with the same jumper setting as the working 4000)
In this way, if you still have 0 Fast mem, it's clear that the motherboard or the simm slots are dameged.

good luck