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Standard Pascal couldn't handle variable-length items (e.g. strings without a compile-time maximum length), so only toy programs could be portable.

• pacman128 6y ago
  Even opening a file with a given path wasn't in the Pascal standard. Different implementations did this completely differently.
• masklinn 6y ago
  And didn't standard pascal also store the runtime length inline as a single byte, limiting strings to 255 bytes?