Early IBM PCs were built like tanks. I'm stil using a 1984 IBM AT keyboard with my current PC (concerned my neighbour can hear my typing at 2:40 a.m.).
Also worth a mention are Psion Organiser II 8-bit machines from the late 80s. Later Psions had all sorts of Achilles heels, but the only problems I've had with Organiser IIs are corrosion on the battery contacts - easily sorted with a bit of household vinegar.
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Also worth a mention are Psion Organiser II 8-bit machines from the late 80s. Later Psions had all sorts of Achilles heels, but the only problems I've had with Organiser IIs are corrosion on the battery contacts - easily sorted with a bit of household vinegar.
My ZX81 works well after all these years, but it has to be said that I've seen rather a lot used as door wedges and the like.