Keyboard

The KITTY uses a custom 40-key mechanical keyboard for input, which is connected to the main board via two cables.

The keyboard can be read directly by the cpu through means of 5 Keyboard Row Registers, where each bit in the byte represents the current state of a particular key (0=unpressed 1=pressed).

Address	Mode	Description	Format (bit 7-0)
$7000	R	Keyboard Row 1	Ctrl X C Space ↑ ← ↓ →
$7010	R	Keyboard Row 2	Menu Z F B N | . Enter
$7020	R	Keyboard Row 3	Shift A D V H M L Backspace
$7030	R	Keyboard Row 4	Alt Q S G Y J K P
$7040	R	Keyboard Row 5	Esc W E R T U I O