@mastaszek, post #1
The horizontal beam position has a value of $0 to $E2. The least significant bit is not used in the comparison, so there are 113 positions available for Copper operations. This corresponds to 4 pixels in low resolution and 8 pixels in high resolution. Horizontal blanking falls in the range of $0F to $35. The standard screen (320 pixels wide) has an unused horizontal portion of $04 to $47 (during which only the background color is displayed).
@mastaszek, post #1
@tukinem, post #11