Oh, lawd! I learned to program on TRS-80 Model I and Model III back in high school. Writing animations in BASIC by sort of bitmapping with extended ASCII characters.<p>The most useful thing I learned was my first security hack. Floppies (all we had) could be password-protected. The teacher's disks (with the video games) were password-protected so we couldn't copy or alter them. So put in your disk. Enter "current password". Replace it with teacher's disk. Enter "new password"...