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I will assume you mean in main memory. Most early computers did not measure memory in bytes, instead in words, as the byte was not defined until the IBM System 360 (which is NOT an early computer) introduced in 1964. Hard disks did not exist until the IBM 305 RAMAC introduced in 1956 (each 350 hard disk on the 305 contained less than 4 Mbytes), most systems used Magnetic tape (the largest tape used was 2400 feet, less than 5 Mbyte).

Some early computers main memory:

  • Zuse Z1 - 64 words, ~150 bytes
  • ABC - 60 words, ~300 bytes
  • Harvard Mark I - 72 words, ~700 bytes
  • ENIAC - 20 words, ~100 bytes
  • Zuse Z4 - 64 words, ~250 bytes
  • EDVAC - 1000 words, ~5 Kbytes
  • EDSAC - 1024 words, ~2 Kbytes
  • SEAC - 512 words, ~3 Kbytes
  • SWAC - 256 words, ~1 Kbytes
  • IAS - 1024 words, ~5 Kbytes
  • LEO - 2048 words, ~8 Kbytes
  • RAYDAC - 1152 words, ~5 Kbytes
  • Whirlwind - 256 words, ~512 bytes
  • UNIVAC I - 1000 words, ~12 Kbytes
  • UNIVAC 1101 - 16384 words, ~48 Kbytes
  • UNIVAC 1103 - 17408 words, ~78 Kbytes
  • IBM 701 - 2048 words, ~9 Kbytes
  • IBM 702 - 10000 characters, ~10 Kbytes
  • IBM 650 - 1000 words, ~5 Kbytes
  • IBM 704 - 4096 words, ~18 Kbytes
  • IBM 705 Model I - 20000 characters, ~20 Kbytes
  • IBM 305 RAMAC - 3200 characters, ~3 Kbytes
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14y ago

What else can I help you with?