4 ms·

Can anyone find the speed of this memory?

• kens 7y ago
  TROS had a cycle time of 625 nanoseconds with an access time of 240 nanoseconds including address decoding and delays through the sense amplifier.
  • ddingus 7y ago
    My Apple 2 has 100ns RAM. I am pretty sure slightly faster machines used 80ns. This old memory speed seems fairly respectable for the time.
    • blattimwind 7y ago
      GPIB, a bus system from the mid 60s, requires a response time of <100 ns to a particular signal. That's one of the reasons why it's still practically impossible to implement in software only 50 years later.
      • ddingus 7y ago
        And we hit that on tech of the era too. Damn cool.
        • blattimwind 7y ago
          We had discrete logic in the late 60s that achieved toggle rates of a couple hundred MHz (ECL), it was just kinda expensive and needed loads of power. It was (and afaik still is) however widely used in aerospace/military applications (high standing currents and low impedance transmission lines probably make for excellent radiation and interference immunity) and used to be common in high end high frequency test equipment (e.g. counter/timers, synthesizers). I've heard ECL was also very popular for implementing cryptographic devices due to its low noise / switching transients.
  • alfalfasprout 7y ago
    That's extremely impressive given the year and the underlying technology.