Changes

|''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

|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

1. On CPC464,CPC664,CPC6128 and GX4000 this is LK3 on the PCB. On the CPC464+ and CPC6128+ this is LK103 on the PCB. On the KC compact this is "1". 2. On CPC464,CPC664,CPC6128 and GX4000 this is LK2 on the PCB. On the CPC464+ and CPC6128+ this is LK102 on the PCB. On the KC compact this is "0". 3. On CPC464,CPC664,CPC6128 and GX4000 this is LK1 on the PCB. On the CPC464+ and CPC6128+ this is LK101 on the PCB. On the KC compact this is /TEST signal from the expansion port. 4. On the CPC464,CPC664,CPC6128,CPC464+,CPC6128+ and GX4000 bits 3,2 and 1 define the manufacturer name. See below to see the options available. The manufacturer name is defined on the PCB and cannot be changed through software. 5. On the CPC464,CPC664,CPC6128,CPC464+,CPC6128+ and GX4000 bit 4 defines the Screen refresh frequency. "1" = 50Hz, "0" = 60Hz. This is defined on the PCB and cannot be changed with software. On the KC compact bit 4 is "1" 6. This * Bit5 bit is connected to /EXP signal on the expansion port.** On the KC Compact this bit is used to define bit 7 of the printer data.** On the CPC, it is possible to use this bit to define bit 7 of the printer data, so a 8-bit printer port is made, with a hardware modification,** On the CPC this can be used by a expansion device to report it's presence. "1" = device connected, "0" = device not connected. This is not always used by all expansion devices. ''is it used by any expansions?''