Medical balance upgrade
This project consisted in the upgrading of the electronic command of a .1 mg accuracy pharmaceutical multi-batch pill-balance. The old system consited in two 3U 19''-rack units, filled with plug-in boards. The 7-segment displays were still old nixie tubes! (You can see those on the first pic, bottom-left)
This is how the early-80's system looked like. You can see the 'beauty' off an authentic all-discrete-TTL logic system.
After 'some' work, all this shrunked into a smaller 1998 version:
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