View source for Sprite Attribute 4 Register

{{NextRegister
|Number=$39
|Readable=No
|Writable=Yes
|ShortDesc=Nextreg port-mirror to write directly into "byte 5" of {{PortNo|$xx57}}.
}}
Byte 5 is bitmapped:
{|class="wikitable"
! Bit !! Description
|-
| 7 || If 1, the pattern will be treated as 4-bit colour one (128 bytes), 0 is for 8-bit colour patterns (256 bytes)
|-
| 6 || Chooses top/bottom part of pattern slot (for 4-bit colour patterns)
0 will target bytes 0..127 of pattern "Name" (byte 4), 1 will target bytes 128..255 of pattern "Name".
|-
| 5 || Reserved, use always 0
|-
| 4-3 || x-axis scale factor: %00 = 1x (16 pixels), %01 = 2x, %10 = 4x, %11 = 8x (128 pixels)
|-
| 2-1 || y-axis scale factor: %00 = 1x (16 pixels), %01 = 2x, %10 = 4x, %11 = 8x (128 pixels)
|-
| 0 || MSB of Y coordinate
|}

See {{PortNo|$xx57}} for extra notes about coordinates and clipping.