Amstrad PC - PC2086 DIP Switches

PC2086 DIP switches

The PC2086 has 8 DIP switches accessible from the back of the case, which control various aspects of the builtin Paradise VGA display hardware.

SW1,2: Initial video mode

These switches only take effect when the built-in Paradise chipset is disabled and an add-on graphics card is plugged into an ISA socket (see SW4 below).

SW1	SW2	Add-on card type
Off	Off	EGA or VGA
Off	On	CGA, 40 columns
On	Off	CGA, 80 columns
On	On	MDA, 80 columns

SW3: Disable built-in serial port

Turn this switch on to disable the built-in serial port, in case you have a modem fitted that also wants to be COM1:

SW4: Disable onboard VGA

If this switch is turned on, the built-in VGA will be disabled and another video card must be used. Switches 1 and 2 set the type of the other card.

SW5: Multisync monitor

If this switch is turned on, the video timings will be altered to provide a better picture on a multisync monitor.

SW6: Auto colour/mono switching

If the switch is on, the video card will automatically switch between colour and monochrome modes depending on what the current program requires. If it is off, then monochrome/colour switching must be done manually with the DISPLAY command.

This switch must be turned off if you fit an MDAor