|11||Cursor End Raster||xxx00000||0||Sets last raster row of character that cursor is on to invert
|-
|12||Display Start Address (High)||xx000000||48||On Amstrad Plus, bit7 of the printer port is controlled by bit3 of CRTC Reg. 12 R12 (ie. bit11 of Display Start Address)
|-
|13||Display Start Address (Low)||00000000||0||Allows you to offset the start of screen memory for hardware scrolling, and if using memory from address &0000 with the firmware.
|15||Cursor Address (Low)||00000000||0
|-
|16||Light Pen Address (High)||xx000000||||Read Only. On CRTC1, bit6 of Status register goes to 0 when R16 is read
|-
|17||Light Pen Address (Low)||00000000||||Read Only. On CRTC1, bit6 of Status register goes to 0 when R17 is read
|-
|}
*Bits 5..4 define the skew (delay) of the DISPTMG signal (00 = Non-skew ; 01 = One-character skew ; 10 = Two-character skew ; 11 = Non-output).
*Bits 3..2 are ignored.
*Bits 1..0 define the interlace mode (00 = No interlaceInterlace; 01 = Interlace Sync; 10 = No Interlace; 11 = Interlace Sync and Video).
UM6845R: