CLISP runs in Microsoft Windows and in Linux. You must edit the term.lisp file to give it the correct name of your serial port. Under Microsoft Windows the name will be something like "COM1" or "COM1:" or "COM2" or "COM2:". Even then, I do not know if it will work under Microsoft Windows. Please try it and let me know. You might need to configure the serial port outside of CLISP, perhaps with the 'mode' command in an autoexec.bat file or in a DOS box:
mode com1: 115200,n,8,1
or whatever is appropriate.
If you try it under Microsoft Windows and get it to work, please post the details or email them to me and I'll update the documentation. See the SerialPort page for other notes.
Microsoft Windows does not properly distinguish between upper and lowercase letters in file names. This used to cause a problem with earlier versions of Riscy Pygness because it used the files riscy.S and riscy.s. They were different files but their names looked the same to Microsoft Windows. Thus, at some point, Microsoft Windows would erase your assembly language source code file. So, in earlier versions, you might have needed to edit the makefile to change the name of riscy.s (i.e. the output of applying gcc to riscy.S) to riscy.asm or some such.
This should no longer be a problem in the current version of Riscy Pygness. It no longer uses both the names riscy.S and riscy.s. Instead it uses riscy.asm and riscy.s.