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221 lines
7.5 KiB
VHDL
Executable File
221 lines
7.5 KiB
VHDL
Executable File
-- ZX Spectrum for Altera DE1
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--
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-- Copyright (c) 2009-2011 Mike Stirling
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--
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-- All rights reserved
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--
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-- Redistribution and use in source and synthezised forms, with or without
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-- modification, are permitted provided that the following conditions are met:
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--
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-- * Redistributions of source code must retain the above copyright notice,
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-- this list of conditions and the following disclaimer.
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--
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-- * Redistributions in synthesized form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- * Neither the name of the author nor the names of other contributors may
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-- be used to endorse or promote products derived from this software without
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-- specific prior written agreement from the author.
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--
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-- * License is granted for non-commercial use only. A fee may not be charged
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-- for redistributions as source code or in synthesized/hardware form without
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-- specific prior written agreement from the author.
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--
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
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-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- POSSIBILITY OF SUCH DAMAGE.
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--
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-- PS/2 scancode to Spectrum matrix conversion
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.NUMERIC_STD.ALL;
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entity keyboard is
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port (
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CLK : in std_logic;
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nRESET : in std_logic;
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-- PS/2 interface
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PS2_CLK : in std_logic;
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PS2_DATA : in std_logic;
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-- CPU address bus (row)
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A : in std_logic_vector(15 downto 0);
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-- Column outputs to ULA
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KEYB : out std_logic_vector(4 downto 0);
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F11 : out std_logic := '0'
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);
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end keyboard;
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architecture rtl of keyboard is
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-- PS/2 interface
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component ps2_intf is
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generic (filter_length : positive := 8);
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port(
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CLK : in std_logic;
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nRESET : in std_logic;
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-- PS/2 interface (could be bi-dir)
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PS2_CLK : in std_logic;
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PS2_DATA : in std_logic;
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-- Byte-wide data interface - only valid for one clock
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-- so must be latched externally if required
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DATA : out std_logic_vector(7 downto 0);
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VALID : out std_logic;
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ERROR : out std_logic
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);
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end component;
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-- Interface to PS/2 block
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signal keyb_data : std_logic_vector(7 downto 0);
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signal keyb_valid : std_logic;
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signal keyb_error : std_logic;
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-- Internal signals
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type key_matrix is array (7 downto 0) of std_logic_vector(4 downto 0);
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signal keys : key_matrix;
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signal release : std_logic;
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signal extended : std_logic;
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begin
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ps2 : ps2_intf port map (
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CLK, nRESET,
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PS2_CLK, PS2_DATA,
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keyb_data, keyb_valid, keyb_error
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);
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-- Output addressed row to ULA
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KEYB <= keys(0) when A(8) = '0' else
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keys(1) when A(9) = '0' else
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keys(2) when A(10) = '0' else
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keys(3) when A(11) = '0' else
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keys(4) when A(12) = '0' else
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keys(5) when A(13) = '0' else
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keys(6) when A(14) = '0' else
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keys(7) when A(15) = '0' else
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(others => '1');
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process(nRESET,CLK)
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begin
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if nRESET = '0' then
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release <= '0';
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extended <= '0';
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keys(0) <= (others => '1');
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keys(1) <= (others => '1');
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keys(2) <= (others => '1');
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keys(3) <= (others => '1');
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keys(4) <= (others => '1');
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keys(5) <= (others => '1');
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keys(6) <= (others => '1');
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keys(7) <= (others => '1');
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F11 <= '0';
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elsif rising_edge(CLK) then
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if keyb_valid = '1' then
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if keyb_data = X"e0" then
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-- Extended key code follows
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extended <= '1';
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elsif keyb_data = X"f0" then
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-- Release code follows
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release <= '1';
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else
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-- Cancel extended/release flags for next time
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release <= '0';
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extended <= '0';
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case keyb_data is
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when X"12" => keys(0)(0) <= release; -- Left shift (CAPS SHIFT)
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when X"59" => keys(0)(0) <= release; -- Right shift (CAPS SHIFT)
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when X"1a" => keys(0)(1) <= release; -- Z
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when X"22" => keys(0)(2) <= release; -- X
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when X"21" => keys(0)(3) <= release; -- C
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when X"2a" => keys(0)(4) <= release; -- V
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when X"1c" => keys(1)(0) <= release; -- A
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when X"1b" => keys(1)(1) <= release; -- S
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when X"23" => keys(1)(2) <= release; -- D
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when X"2b" => keys(1)(3) <= release; -- F
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when X"34" => keys(1)(4) <= release; -- G
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when X"15" => keys(2)(0) <= release; -- Q
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when X"1d" => keys(2)(1) <= release; -- W
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when X"24" => keys(2)(2) <= release; -- E
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when X"2d" => keys(2)(3) <= release; -- R
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when X"2c" => keys(2)(4) <= release; -- T
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when X"16" => keys(3)(0) <= release; -- 1
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when X"1e" => keys(3)(1) <= release; -- 2
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when X"26" => keys(3)(2) <= release; -- 3
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when X"25" => keys(3)(3) <= release; -- 4
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when X"2e" => keys(3)(4) <= release; -- 5
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when X"45" => keys(4)(0) <= release; -- 0
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when X"46" => keys(4)(1) <= release; -- 9
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when X"3e" => keys(4)(2) <= release; -- 8
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when X"3d" => keys(4)(3) <= release; -- 7
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when X"36" => keys(4)(4) <= release; -- 6
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when X"4d" => keys(5)(0) <= release; -- P
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when X"44" => keys(5)(1) <= release; -- O
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when X"43" => keys(5)(2) <= release; -- I
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when X"3c" => keys(5)(3) <= release; -- U
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when X"35" => keys(5)(4) <= release; -- Y
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when X"5a" => keys(6)(0) <= release; -- ENTER
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when X"4b" => keys(6)(1) <= release; -- L
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when X"42" => keys(6)(2) <= release; -- K
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when X"3b" => keys(6)(3) <= release; -- J
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when X"33" => keys(6)(4) <= release; -- H
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when X"29" => keys(7)(0) <= release; -- SPACE
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when X"14" => keys(7)(1) <= release; -- CTRL (Symbol Shift)
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when X"3a" => keys(7)(2) <= release; -- M
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when X"31" => keys(7)(3) <= release; -- N
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when X"32" => keys(7)(4) <= release; -- B
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-- Cursor keys - these are actually extended (E0 xx), but
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-- the scancodes for the numeric keypad cursor keys are
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-- are the same but without the extension, so we'll accept
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-- the codes whether they are extended or not
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when X"6B" => keys(0)(0) <= release; -- Left (CAPS 5)
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keys(3)(4) <= release;
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when X"72" => keys(0)(0) <= release; -- Down (CAPS 6)
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keys(4)(4) <= release;
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when X"75" => keys(0)(0) <= release; -- Up (CAPS 7)
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keys(4)(3) <= release;
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when X"74" => keys(0)(0) <= release; -- Right (CAPS 8)
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keys(4)(2) <= release;
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-- Other special keys sent to the ULA as key combinations
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when X"66" => keys(0)(0) <= release; -- Backspace (CAPS 0)
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keys(4)(0) <= release;
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when X"58" => keys(0)(0) <= release; -- Caps lock (CAPS 2)
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keys(3)(1) <= release;
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when X"76" => keys(0)(0) <= release; -- Escape (CAPS SPACE)
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keys(7)(0) <= release;
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when X"78" => F11 <= not release; -- F11 key
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when others =>
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null;
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end case;
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end if;
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end if;
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end if;
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end process;
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end architecture;
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