Re: every byte mattered ...
"I'd used unixes on 68000s for chip design work and they had been very stable"
I had a short gig developing some reporting stuff for a factory installation on a Motorola box. At the end I had to go to Italy to install it on site. The machine kept crashing & I'd find odd files in lost+found which were clearly dumps of bits of memory. There were odd murmurs from my client's client about not letting me go until it ran. Fortunately it eventually managed a clean run and I escaped. I later heard it was traced to faulty memory.