Using Keyrah V3
3.2.2 Power LED
The Power LED shows one of three states:
• Blinking. This means the device is in pre-initializing state. If it stays in this state then a
power cycle is needed.
• Fading on and off. This means the device has been suspended. It might be possible to wake
it up by pressing any key.
• On. Device is ready :)
3.2.3 Keyboard status LEDs
Two keyboard status LEDs are available at the external connectors – „Num Lock“ and „Scroll
Lock“. Generally those will indicate the status their names imply, with the following exceptions:
• The „Num Lock“ LED output can not be used with keyboards that have a serial interface:
Amiga 500, Atari ST, PS/2, PC/XT
• When using a CBM keyboard, the „Scroll Lock“ LED will show the CAPS lock status –
except when using a SX64 Keyboard (which has a shiftlock LED).
• When using an Amiga 500 Keyboard, the „Drive“ LED will show the „Num Lock“ Status.
• When using an Atari ST Keyboard, the LED on the Keyboard will show the CAPS lock
status. Unfortunately the „Num Lock“ and „Scroll Lock“ LEDs can not be used with this
keyboard.
3.2.4 Extra LED
Note that this pin was originally only intended for testing, directly goes to a I/O pin of the
CPU and is completely unprotected. Its use is not recommended nor supported – if you don’t
know what that means skip the following paragraph and do NOT use it.
One extra LED can be connected between Pin 4 of the C64 keyboard connector and GND (for
example Pin 1 of the C64 keyboard connector), depending on the keyboard in use it will show one
of the following:
• Caps-Lock when an SX64, PC/XT or PS/2 Keyboard is used.
• Num-Lock when an Atari ST Keyboard is used.
• Scroll-Lock when an Amiga 500, C64, C16, C128, CBM2 or PET (via DB25 Adapter)
Keyboard is used.
The extra LED can NOT be used with a C64 or Amiga 1200 keyboard.
Remember that you MUST use at least a current limiting resistor in series, preferably a driver
IC, with the LED, or you WILL damage the Hardware!
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