TOvcCalculatorButton

type TOvcCalculatorButton = (

  cbNone,

  cbTape,

  cbBack,

  cbClearEntry,

  cbClear,

  cbAdd,

  cbSub,

  cbMul,

  cbDiv,

  cb0,

  cb1,

  cb2,

  cb3,

  cb4,

  cb5,

  cb6,

  cb7,

  cb8,

  cb9,

  cbDecimal,

  cbEqual,

  cbInvert,

  cbChangeSign,

  cbPercent,

  cbSqrt,

  cbMemClear,

  cbMemRecall,

  cbMemStore,

  cbMemAdd,

  cbMemSub,

  cbSubTotal

);