|13||Display Start Address (Low)||Read/Write||Write||Read/Write||00000000||0||Allows you to offset the start of screen memory for hardware scrolling, and if using memory from address &0000 with the firmware.
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|14||Cursor Address (High)||colspan=3 style="text-align: center;"|Read/Write||xx000000||0||
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|15||Cursor Address (Low)||colspan=3 style="text-align: center;"|Read/Write||00000000||0||
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|16||Light Pen Address (High)||colspan=3 style="text-align: center;"|Read||xx000000||||Read Only. On CRTC1, bit6 of Status register goes to 0 when R16 is read