Ypsilon Scheme System has been developed as a fundamental technology for LittleWing Pinball Construction System. It is named after Yoshikatsu Fujita, the author of the program. It is distributed by BSD-like License.
The pinball game rules are described in C or C . Though they have great advantages in processing speed, there are some difficulties in development because C language stops the program immediately upon encountering an error. It makes debugging programs very difficult.
Ypsilon makes programming game rules very easy and safe. Of course, the advantages of using Ypsilon are not only for pinball games. It is good for applications of any kind that require quick, interactive processing as it is in conformity with the latest R6RS and provides complete R6RS standard libraries.
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