Changes
8255
,/* PPI Port B */
{|{{Prettytable|width: 700px; font-size: 2em;}}
|''Bit''||''Description''||''Usagein CPC''||Usage in KC Compact
|-
|7||CAS.IN||Cassette read dataRdata input||Cassette data input
|-
|6||PRN.BUSY||Parallel/Printer port ready signal||"1" = not ready, "0" = Ready
|-
|5||/EXP||(note 6)||Expansion Port /EXP pin||Printer data bit7
|-
|4||LK4(note 5)||Screen Refresh Rate||Purpose unknown (set to "1")
|-
|3||LK3(note 1)||Manufacturer ID||Purpose unknown (note 4set to "1")
|-
|2||LK2(note 2)||Manufacturer ID||Purpose unknown (set to "0")
|-
|1||LK1(note 3)||Manufacturer ID||Expansion Port /TEST pin
|-
|0||6845 VSYNC||State of VSYNC from 6845. "1" = VSYNC active, "0" = VSYNC inactive
|-
|}
