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Such as in this image: Intel Bubble Memory chip (from Wikipedia) I guess some sort of configuration, am I right?

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Apparently, the hexadecimal digits indicate which minor loops should not be used, as per Vintage Bubble Memory.

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    \$\begingroup\$ Given the number of bits high in the label here and grid that exactly fills the label, one might wonder if they are a bitmap loops that should be used. The label at your link has far few 1's so maybe those do indicate the bad loops. \$\endgroup\$ Aug 4 '16 at 17:13
  • \$\begingroup\$ Looking at the images on that page, there appear to have been several different notations used. If I had to guess, Intel (among others) used 1s for good loops, Motorola and Fujitsu (among others) used 1s for bad loops, and TI used some other sort of notation entirely. \$\endgroup\$
    – user39382
    Aug 4 '16 at 22:11

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