| 摘要 |
PURPOSE:To record and control the client's ball holdings, allow a client to return the balls held by the client and prevent the client from altering the contents of the record by providing a subtracter which subtracts the drawn-out number of balls from the ball holdings, an adder which adds the number of balls possessed by the client to the ball holdings, and a writer which writes the calculated results in a memory of a main unit. CONSTITUTION:A microprocessor 28 for a client A consists of a number reader 29 which reads the client's identification number recorded on a magnetic disk 25, a readout device 30 which reads out the ball holdings data N0 from a server 11, a subtracter 34 which subtracts the drawn-out ball number N1 from the ball holdings N0 to gain a new ball holdings N0, and a rewriting device 35 which rewrite the renewed ball holdings N0 in the server 11. On the other hand, a microprocessor 38 for a client B is composed of a card reader 37, a number reader 39, data readout device 40, a ball number counter 41 which counts the number of balls N2 held by the client at the end of a game, an adder 42 which adds the number of balls N2 held by the client at present to the ball holdings N0, and a writer 43 which stores the renewed ball holding N0 into the server 11. |
