|6||PRN.BUSY||Parallel/Printer port ready signal, "1" = not ready, "0" = Ready||Same as on CPC
|-
|5||/EXP(note 6)||Expansion Port /EXP pin||Printer data bit7
|-
|4||LK4(note 5)||Screen Refresh Rate ("1"=50Hz, "0"=60Hz)||Purpose unknown (not same as on CPC?) (set to "1")
|-
|3||LK3||Manufacturer ID bit3||Purpose unknown (set to "1")
|1||LK1||Manufacturer ID bit1||Expansion Port /TEST pin
|-
|0||[[6845|CRTC]] VSYNC||State of VSYNC from 6845. Vertical Sync ("1" = VSYNC active, "0" = VSYNC inactive)||Same as on CPC
|-
|}