Setting the power source jumper.

A small, two-position jumper on the EZKey-XS sets the source of power for the EZKey-XS and keyboard. This should be set to the �A12� (rearmost) position (meaning that the power is drawn directly from the A1200 via its connector socket) for normal use. If however you are using an ATX power supply to power your Amiga and have the necessary ATX to AT converter cable you should set the jumper to the �PSU� (front) position. You will also need to ensure that the control connector of the ATX-to-AT PSU converter cable is connected to the EZKey-XS (see above) and that the front panel �power� momentary push button switch on the front of the tower is connected to the �ATX sw� connector of the EZKey-XS.

Special hardware features of the EZKey-XS

POST (Power On Self Test).

When the EZKey-XS is first powered up it performs a power-up self test, then initialises communications with both the Amiga and the keyboard (if attached). If communications are successfully established with the Amiga, but no keyboard is detected the EZKey-XS goes into a �listening� mode which allows it to autodetect and initialise a PC or Amiga keyboard which may be subsequently plugged in. If communications with the Amiga cannot be established (because the Amiga is not responding), the EZKey-XS waits indefinitely for an appropriate response from the Amiga before proceeding further. If successive pressings of the �Caps lock� key on PC or Amiga keyboard toggle the caps lock light on and off then communications with the Amiga have been properly initialised. If this is not the case the most likely cause is that the keyboard adapter is not properly seated on IC U7(A1200) or U350(A4000), or that the power source jumper is incorrectly set.

Auto k/b detection

The EZKey-XS will autodetect which sort of keyboard is plugged in at power up time, a serial Amiga A1000/2000/3000/4000 type or a PC-AT type. If no keyboard is detected at initial power-up time then either keyboard type can be subsequently plugged in and be autodetected at that point. However once a particular type of keyboard has been detected that type will be

locked-in until the next time the Amiga is powered on. The detected keyboard type however can be freely plugged in and removed during the Amigas current power-on state which is important, for example, when switching a keyboard (& monitor) between Amiga and PC using the KMON (& xMON) switchers.

Hard reset

The EZKey-XS is equipped with a �hard reset� connector for attaching to the front panel reset button of a tower system. However, unlike a keyboard-generated reset, no �reset warning� is sent to the Amiga to allow it to terminate hard disk operations etc. You should always use the keyboard generated reset (L_Amiga+R_Amiga +Control) wherever possible, only resorting to the �hard reset� when the Amiga has completely locked up.

ATX PSU switch

As mentioned above there is provision for connecting the momentary ATX power supply push button switch on the front of most modern towers directly to the EZKey-XS. In use, pressing the front panel reset button makes the EZKey-XS generate the proper �Amiga reset warning� sequence before powering down the ATX PSU. This means that the EZKey-XS must be able to communicate with the Amiga for the front button (or keyboard activated) ATX power switch facility to work properly. In the event that communications have been lost (eg by an Amiga system crash) then you will have to power down by removing the mains feed (many, but not all ATX PSU�s have a mains switch built into them).

Once the Amiga has been powered down the EZKey-XS and the attached keyboard are powered directly by the �stand-by� feed on the ATX PSU. This means that they remain fully operational during the Amiga power down phase (caps lock etc still work normally) but obviously no data is sent to the Amiga. This means that the ATX power supply (and the Amiga) can be powered up again using the front panel power switch or the Power-on key combination L_Amiga+R_Amiga+Delete (see below). On first (AC mains) power up the EZKey-XS always fully switches on the ATX PSU so that communications can be established with the Amiga.

xMon control

The xMON is a family of high quailty video switch