Changes
8255
,/* PPI Port B */
{|{{Prettytable|width: 700px; font-size: 2em;}}
|''Bit''||''Description''||''Usage in CPC''||''Usage in KC Compact''
|-
|7||CAS.IN||Cassette data input||Cassette data inputSame as on CPC
|-
|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(note 1)||Manufacturer IDbit3||Purpose unknown (set to "1")
|-
|2||LK2(note 2)||Manufacturer IDbit2||Purpose unknown (set to "0")
|-
|1||LK1(note 3)||Manufacturer IDbit1||Expansion Port /TEST pin
|-
|0||VSYNC||State of VSYNC from 6845. "1" = VSYNC active, "0" = VSYNC inactive
|}
Table showing manufacturer name on power-up (CPC and CPC+ only):