Delete comment from: Ken Shirriff's blog
Not only IBM is known to have found use for their faulty DRAMs. I have SIMMs that use Siemens 256k x 3(!) DRAM chips. These are actually 256kx4bit ICs with (at least) a faulty bit. Solder bridges on the SIMMs allow selection of which bit not to use.
Must still have been cheaper to put three faulty ICs (+ custom solder bridges) on a SIMM than two good ones.
Jan 26, 2021, 2:51:00 AM
Posted to Examining a technology sample kit: IBM components from 1948 to 1986