Reply to note from Edward Mendelson <em36@xxxxxxxxxxxx> Sun, 8 Jan 2023 18:50:04 -0500 Edward, > Could you give some idea of what happens when I type XYCP 437... ? I could render an exact accounting, but the fact that the XYCP command triggers "Application error" indicates that Xy4 is not even recognizing XYCP as part of U2. Which is perplexing. I asked before, but can you please say: If you command CASG 652<F11>, what do you see? And let's try this: If you command KTS 650<F11>, does the prompt line (the second line on the DOS screen) report "748 mph"? KTS is a simple-arithmetic routine that converts knots to miles per hour. It's located further down XYWWWEB.U2 than XYCP -- meaning that if "KTS 650" returns "Application error", it's clear that U2 is not loading correctly on your system. Let us know. -- Carl Distefano cld@xxxxxxxxxx