When my drive got busted, I went to the monitor (CALL -151 was it?) and typed in assembly something that me and a buddy of mine come - basically changing the sp

When my drive got busted, I went to the monitor (CALL -151 was it?) and typed in assembly something that me and a buddy of mine come - basically changing the speed of the disk, based on the key you pressed - something like a piano. But the sound was important. Normal DOS directory track was number 11, so it sounded one way, while the cool stuff sounded differently - games, apps, etc. It was awesome time, back then, before teh internet...