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A yellow line, much like when you make it show spaces and tabs.

From your perspective, it looks like the menu didn't accommodate the screen resolution so a part of the menu went offscreen of the resolution of the monitor. You probably have...

A new lunar magic, version 3.00 added a large number of hijacks to the game and messing up most of the ASM resources. This version expands the level so that...

Something like this: Label0: LDA #$12 STA $00 Display as: Label0: LDA #$12 ;$000000 STA $00 ;$000002 Where the address of each opcode/instructions displayed as comments on the right side.