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This is a design document for a Model 100 terminal program.


  • 38400bps support
  • Hardware flow control
  • The core should be open, educational, and reusable in other applications
  • Permit queueing of multiple receive or transmit operations
  • "Zero copy" - receive and transmit directly to/from the clients memory.
  • Configurable RX level high/low watermarks for disable/re-enable of RTS
  • Adjustable number of RX buffers and buffer size
  • Interleaved transmit and receive
  • Priority of operations are:
    • The current RX or TX operation as an atomic unit
    • Keyboard polling
    • Bottom line display
    • No-scroll display updates
    • Scrolling updates