'''Links''' - Amstrad has used a number of LKs (Links) on CPC mainboards and on peripherals like DDI-1 and CPC+ Cartridges. The LKs are simply a piece of wire that is (or is not) installed between two soldering points.
'''Resistors''' - The CPC+ does additionally have some optional 10kOhm resistors with similar functions (they connect to the ASICs MUX pins, which are used as configuration input (affected by the resistor), and as ADC channel select output (not affected by the resistor; but won't work when using wires instead of resistors). Note: In schematics, these resistors are labeled R128,R129,R130 - but, on the mainboard they are labeled R28,R29,R30.
== LK1,LK2,LK3 - Manufacturer ID ==
Same as DDI-1:LK1 (see there).
== CPC Plus:R128 aka R28 (10kOhm) - 128K RAM Enable ==
Installed for 128K DRAM, not installed for 64K DRAM.
== CPC Plus:R129 aka R29 (10kOhm) - Disc Vers Enable ==
'''Purpose Unknown !!!'''
This is not verified, can somebody test what happens when installing/removing R129 ?
== CPC Plus:R130 aka R30 (10kOhm) - 8bit Printer Enable ==
When installed (default), enables the 8th printer bit, controlled via [[CRTC]]. When removed, outputs LOW as 8th bit (as on classic CPCs with 7bit printer port). See also: [[8bit Printer Ports]].