Hello, I'm just wondering about something real quick. You see, me and an associate are attempting to recreate a 4BOD emulator, but there seems to be some strange behavior in this official version that doesn't make sense. Specifically, this program:
1010 0000 0000
0101
0010 0000
According to the documentation, this should create a diagonal line which flashes across the screen. However, it seems to leave behind a single pixel at the top left. Is there any specific reason for this, or is it a bug?