Index: uspace/app/tester/meson.build
===================================================================
--- uspace/app/tester/meson.build	(revision c21cc26f3786e218650cb260107b00862470ac5c)
+++ uspace/app/tester/meson.build	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -1,3 +1,4 @@
 #
+# Copyright (c) 2021 Jiri Svoboda
 # Copyright (c) 2005 Martin Decky
 # Copyright (c) 2007 Jakub Jermar
@@ -28,5 +29,5 @@
 #
 
-deps = [ 'block', 'drv', 'math' ]
+deps = [ 'block', 'codepage', 'drv', 'math' ]
 src = files(
 	'tester.c',
Index: uspace/app/tester/print/print4.c
===================================================================
--- uspace/app/tester/print/print4.c	(revision c21cc26f3786e218650cb260107b00862470ac5c)
+++ uspace/app/tester/print/print4.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -1,3 +1,4 @@
 /*
+ * Copyright (c) 2021 Jiri Svoboda
  * Copyright (c) 2009 Martin Decky
  * All rights reserved.
@@ -27,4 +28,5 @@
  */
 
+#include <codepage/cp437.h>
 #include <stdio.h>
 #include <stddef.h>
@@ -51,12 +53,22 @@
 	}
 
-	TPRINTF("\nExtended ASCII characters (128 - 255) using printf(\"%%lc\"):\n");
+	/*
+	 * Print entire code page 437 (in Unicode)
+	 *
+	 * The purpose of this test is to verify that the EGA display
+	 * driver can correctly map every code page 437 character back
+	 * from Unicode and display it.
+	 *
+	 * With a Unicode-capable display this will just give you a bit
+	 * of nostalgia.
+	 */
+	TPRINTF("\nCode page 437 characters (converted to Unicode):\n");
 
-	for (group = 4; group < 8; group++) {
+	for (group = 0; group < 8; group++) {
 		TPRINTF("%#x: ", group << 5);
 
 		uint8_t index;
 		for (index = 0; index < 32; index++)
-			TPRINTF("%lc", (wint_t) ((group << 5) + index));
+			TPRINTF("%lc", cp437_decode((group << 5) + index));
 
 		TPRINTF("\n");
Index: uspace/lib/codepage/doc/doxygroups.h
===================================================================
--- uspace/lib/codepage/doc/doxygroups.h	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/doc/doxygroups.h	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,3 @@
+/** @addtogroup libcodepage libcodepage
+ * @ingroup libs
+ */
Index: uspace/lib/codepage/include/codepage/cp437.h
===================================================================
--- uspace/lib/codepage/include/codepage/cp437.h	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/include/codepage/cp437.h	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2021 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libcodepage
+ * @{
+ */
+/**
+ * @file Code page 437
+ */
+
+#ifndef _CODEPAGE_CP437_H
+#define _CODEPAGE_CP437_H
+
+#include <errno.h>
+#include <stdint.h>
+#include <str.h>
+
+extern char32_t cp437_decode(uint8_t);
+extern errno_t cp437_encode(char32_t, uint8_t *);
+
+#endif
+
+/** @}
+ */
Index: uspace/lib/codepage/meson.build
===================================================================
--- uspace/lib/codepage/meson.build	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/meson.build	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2021 Jiri Svoboda
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+src = files(
+	'src/cp437.c',
+)
+
+test_src = files(
+	'test/cp437.c',
+	'test/main.c',
+)
Index: uspace/lib/codepage/src/cp437.c
===================================================================
--- uspace/lib/codepage/src/cp437.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/src/cp437.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,328 @@
+/*
+ * Copyright (c) 2021 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libcodepage
+ * @{
+ */
+/**
+ * @file Code page 437
+ *
+ * The ROM fonts of graphics adapters decending from IBM's MDA/CGA
+ * use Code Page 437 and provide popular graphic characters
+ * (such as box drawing) used in text-based user interfaces.
+ */
+
+#include <codepage/cp437.h>
+#include <errno.h>
+#include <stdint.h>
+#include <str.h>
+
+/** All 256 graphic characters of Code Page 437 represented in Unicode */
+static char32_t cp437[256] = {
+	/* 0x */
+	L'\x0000', L'\x263a', L'\x263b', L'\x2665',
+	L'\x2666', L'\x2663', L'\x2660', L'\x2022',
+	L'\x25d8', L'\x25cb', L'\x25d9', L'\x2642',
+	L'\x2640', L'\x266a', L'\x266b', L'\x263c',
+
+	/* 1x */
+	L'\x25ba', L'\x25c4', L'\x2195', L'\x203c',
+	L'\x00b6', L'\x00a7', L'\x25ac', L'\x21a8',
+	L'\x2191', L'\x2193', L'\x2192', L'\x2190',
+	L'\x221f', L'\x2194', L'\x25b2', L'\x25bc',
+
+	/* 2x */
+	L'\x0020', L'\x0021', L'\x0022', L'\x0023',
+	L'\x0024', L'\x0025', L'\x0026', L'\x0027',
+	L'\x0028', L'\x0029', L'\x002a', L'\x002b',
+	L'\x002c', L'\x002d', L'\x002e', L'\x002f',
+
+	/* 3x */
+	L'\x0030', L'\x0031', L'\x0032', L'\x0033',
+	L'\x0034', L'\x0035', L'\x0036', L'\x0037',
+	L'\x0038', L'\x0039', L'\x003a', L'\x003b',
+	L'\x003c', L'\x003d', L'\x003e', L'\x003f',
+
+	/* 4x */
+	L'\x0040', L'\x0041', L'\x0042', L'\x0043',
+	L'\x0044', L'\x0045', L'\x0046', L'\x0047',
+	L'\x0048', L'\x0049', L'\x004a', L'\x004b',
+	L'\x004c', L'\x004d', L'\x004e', L'\x004f',
+
+	/* 5x */
+	L'\x0050', L'\x0051', L'\x0052', L'\x0053',
+	L'\x0054', L'\x0055', L'\x0056', L'\x0057',
+	L'\x0058', L'\x0059', L'\x005a', L'\x005b',
+	L'\x005c', L'\x005d', L'\x005e', L'\x005f',
+
+	/* 6x */
+	L'\x0060', L'\x0061', L'\x0062', L'\x0063',
+	L'\x0064', L'\x0065', L'\x0066', L'\x0067',
+	L'\x0068', L'\x0069', L'\x006a', L'\x006b',
+	L'\x006c', L'\x006d', L'\x006e', L'\x006f',
+
+	/* 7x */
+	L'\x0070', L'\x0071', L'\x0072', L'\x0073',
+	L'\x0074', L'\x0075', L'\x0076', L'\x0077',
+	L'\x0078', L'\x0079', L'\x007a', L'\x007b',
+	L'\x007c', L'\x007d', L'\x007e', L'\x2302',
+
+	/* 8x */
+	L'\x00c7', L'\x00fc', L'\x00e9', L'\x00e2',
+	L'\x00e4', L'\x00e0', L'\x00e5', L'\x00e7',
+	L'\x00ea', L'\x00eb', L'\x00e8', L'\x00ef',
+	L'\x00ee', L'\x00ec', L'\x00c4', L'\x00c5',
+
+	/* 9x */
+	L'\x00c9', L'\x00e6', L'\x00c6', L'\x00f4',
+	L'\x00f6', L'\x00f2', L'\x00fb', L'\x00f9',
+	L'\x00ff', L'\x00d6', L'\x00dc', L'\x00a2',
+	L'\x00a3', L'\x00a5', L'\x20a7', L'\x0192',
+
+	/* Ax */
+	L'\x00e1', L'\x00ed', L'\x00f3', L'\x00fa',
+	L'\x00f1', L'\x00d1', L'\x00aa', L'\x00ba',
+	L'\x00bf', L'\x2310', L'\x00ac', L'\x00bd',
+	L'\x00bc', L'\x00a1', L'\x00ab', L'\x00bb',
+
+	/* Bx */
+	L'\x2591', L'\x2592', L'\x2593', L'\x2502',
+	L'\x2524', L'\x2561', L'\x2562', L'\x2556',
+	L'\x2555', L'\x2563', L'\x2551', L'\x2557',
+	L'\x255d', L'\x255c', L'\x255b', L'\x2510',
+
+	/* Cx */
+	L'\x2514', L'\x2534', L'\x252c', L'\x251c',
+	L'\x2500', L'\x253c', L'\x255e', L'\x255f',
+	L'\x255a', L'\x2554', L'\x2569', L'\x2566',
+	L'\x2560', L'\x2550', L'\x256c', L'\x2567',
+
+	/* Dx */
+	L'\x2568', L'\x2564', L'\x2565', L'\x2559',
+	L'\x2558', L'\x2552', L'\x2553', L'\x256b',
+	L'\x256a', L'\x2518', L'\x250c', L'\x2588',
+	L'\x2584', L'\x258c', L'\x2590', L'\x2580',
+
+	/* Ex */
+	L'\x03b1', L'\x00df', L'\x0393', L'\x03c0',
+	L'\x03a3', L'\x03c3', L'\x00b5', L'\x03c4',
+	L'\x03a6', L'\x0398', L'\x03a9', L'\x03b4',
+	L'\x221e', L'\x03c6', L'\x03b5', L'\x2229',
+
+	/* Fx */
+	L'\x2261', L'\x00b1', L'\x2265', L'\x2264',
+	L'\x2320', L'\x2321', L'\x00f7', L'\x2248',
+	L'\x00b0', L'\x2219', L'\x00b7', L'\x221a',
+	L'\x207f', L'\x00b2', L'\x25a0', L'\x00a0'
+};
+
+/** Map of Unicode characters 0x0000 - 0x0400 to code page 437 */
+static uint8_t u0xxx_to_cp437[0x400] = {
+	/* 0x */
+	[0x0000] = 0x00,
+
+	/* 1x */
+	[0x00b6] = 0x14, [0x00a7] = 0x15,
+
+	/* 2x */
+	[0x0020] = 0x20, [0x0021] = 0x21, [0x0022] = 0x22, [0x0023] = 0x23,
+	[0x0024] = 0x24, [0x0025] = 0x25, [0x0026] = 0x26, [0x0027] = 0x27,
+	[0x0028] = 0x28, [0x0029] = 0x29, [0x002a] = 0x2a, [0x002b] = 0x2b,
+	[0x002c] = 0x2c, [0x002d] = 0x2d, [0x002e] = 0x2e, [0x002f] = 0x2f,
+
+	/* 3x */
+	[0x0030] = 0x30, [0x0031] = 0x31, [0x0032] = 0x32, [0x0033] = 0x33,
+	[0x0034] = 0x34, [0x0035] = 0x35, [0x0036] = 0x36, [0x0037] = 0x37,
+	[0x0038] = 0x38, [0x0039] = 0x39, [0x003a] = 0x3a, [0x003b] = 0x3b,
+	[0x003c] = 0x3c, [0x003d] = 0x3d, [0x003e] = 0x3e, [0x003f] = 0x3f,
+
+	/* 4x */
+	[0x0040] = 0x40, [0x0041] = 0x41, [0x0042] = 0x42, [0x0043] = 0x43,
+	[0x0044] = 0x44, [0x0045] = 0x45, [0x0046] = 0x46, [0x0047] = 0x47,
+	[0x0048] = 0x48, [0x0049] = 0x49, [0x004a] = 0x4a, [0x004b] = 0x4b,
+	[0x004c] = 0x4c, [0x004d] = 0x4d, [0x004e] = 0x4e, [0x004f] = 0x4f,
+
+	/* 5x */
+	[0x0050] = 0x50, [0x0051] = 0x51, [0x0052] = 0x52, [0x0053] = 0x53,
+	[0x0054] = 0x54, [0x0055] = 0x55, [0x0056] = 0x56, [0x0057] = 0x57,
+	[0x0058] = 0x58, [0x0059] = 0x59, [0x005a] = 0x5a, [0x005b] = 0x5b,
+	[0x005c] = 0x5c, [0x005d] = 0x5d, [0x005e] = 0x5e, [0x005f] = 0x5f,
+
+	/* 6x */
+	[0x0060] = 0x60, [0x0061] = 0x61, [0x0062] = 0x62, [0x0063] = 0x63,
+	[0x0064] = 0x64, [0x0065] = 0x65, [0x0066] = 0x66, [0x0067] = 0x67,
+	[0x0068] = 0x68, [0x0069] = 0x69, [0x006a] = 0x6a, [0x006b] = 0x6b,
+	[0x006c] = 0x6c, [0x006d] = 0x6d, [0x006e] = 0x6e, [0x006f] = 0x6f,
+
+	/* 7x */
+	[0x0070] = 0x70, [0x0071] = 0x71, [0x0072] = 0x72, [0x0073] = 0x73,
+	[0x0074] = 0x74, [0x0075] = 0x75, [0x0076] = 0x76, [0x0077] = 0x77,
+	[0x0078] = 0x78, [0x0079] = 0x79, [0x007a] = 0x7a, [0x007b] = 0x7b,
+	[0x007c] = 0x7c, [0x007d] = 0x7d, [0x007e] = 0x7e,
+
+	/* 8x */
+	[0x00c7] = 0x80, [0x00fc] = 0x81, [0x00e9] = 0x82, [0x00e2] = 0x83,
+	[0x00e4] = 0x84, [0x00e0] = 0x85, [0x00e5] = 0x86, [0x00e7] = 0x87,
+	[0x00ea] = 0x88, [0x00eb] = 0x89, [0x00e8] = 0x8a, [0x00ef] = 0x8b,
+	[0x00ee] = 0x8c, [0x00ec] = 0x8d, [0x00c4] = 0x8e, [0x00c5] = 0x8f,
+
+	/* 9x */
+	[0x00c9] = 0x90, [0x00e6] = 0x91, [0x00c6] = 0x92, [0x00f4] = 0x93,
+	[0x00f6] = 0x94, [0x00f2] = 0x95, [0x00fb] = 0x96, [0x00f9] = 0x97,
+	[0x00ff] = 0x98, [0x00d6] = 0x99, [0x00dc] = 0x9a, [0x00a2] = 0x9b,
+	[0x00a3] = 0x9c, [0x00a5] = 0x9d,                  [0x0192] = 0x9f,
+
+	/* Ax */
+	[0x00e1] = 0xa0, [0x00ed] = 0xa1, [0x00f3] = 0xa2, [0x00fa] = 0xa3,
+	[0x00f1] = 0xa4, [0x00d1] = 0xa5, [0x00aa] = 0xa6, [0x00ba] = 0xa7,
+	[0x00bf] = 0xa8,                  [0x00ac] = 0xaa, [0x00bd] = 0xab,
+	[0x00bc] = 0xac, [0x00a1] = 0xad, [0x00ab] = 0xae, [0x00bb] = 0xaf,
+
+	/* Ex */
+	[0x03b1] = 0xe0, [0x00df] = 0xe1, [0x0393] = 0xe2, [0x03c0] = 0xe3,
+	[0x03a3] = 0xe4, [0x03c3] = 0xe5, [0x00b5] = 0xe6, [0x03c4] = 0xe7,
+	[0x03a6] = 0xe8, [0x0398] = 0xe9, [0x03a9] = 0xea, [0x03b4] = 0xeb,
+	/* skipped */    [0x03c6] = 0xed, [0x03b5] = 0xee,
+
+	/* Fx */
+	/* skipped */    [0x00b1] = 0xf1,
+	/* skipped */                     [0x00f7] = 0xf6,
+	[0x00b0] = 0xf8, [0x00b7] = 0xfa,
+	/* skipped */    [0x00b2] = 0xfd,                  [0x00a0] = 0xff,
+};
+
+/** Map of Unicode characters 0x2000 - 0x2700 to code page 437 */
+static uint8_t u2xxx_to_cp437[0x700] = {
+	/* 0x */
+	/* skipped */   [0x63a] = 0x01, [0x63b] = 0x02, [0x665] = 0x03,
+	[0x666] = 0x04, [0x663] = 0x05, [0x660] = 0x06, [0x022] = 0x07,
+	[0x5d8] = 0x08, [0x5cb] = 0x09, [0x5d9] = 0x0a, [0x642] = 0x0b,
+	[0x640] = 0x0c, [0x66a] = 0x0d, [0x66b] = 0x0e, [0x63c] = 0x0f,
+
+	/* 1x */
+	[0x5ba] = 0x10, [0x5c4] = 0x11, [0x195] = 0x12, [0x03c] = 0x13,
+	/* skipped */                   [0x5ac] = 0x16, [0x1a8] = 0x17,
+	[0x191] = 0x18, [0x193] = 0x19, [0x192] = 0x1a, [0x190] = 0x1b,
+	[0x21f] = 0x1c, [0x194] = 0x1d, [0x5b2] = 0x1e, [0x5bc] = 0x1f,
+
+	/* 7x */
+	[0x302] = 0x7f,
+
+	/* 9x */
+	[0x0a7] = 0x9e,
+
+	/* Ax */
+	[0x310] = 0xa9,
+
+	/* Bx */
+	[0x591] = 0xb0, [0x592] = 0xb1, [0x593] = 0xb2, [0x502] = 0xb3,
+	[0x524] = 0xb4, [0x561] = 0xb5, [0x562] = 0xb6, [0x556] = 0xb7,
+	[0x555] = 0xb8, [0x563] = 0xb9, [0x551] = 0xba, [0x557] = 0xbb,
+	[0x55d] = 0xbc, [0x55c] = 0xbd, [0x55b] = 0xbe, [0x510] = 0xbf,
+
+	/* Cx */
+	[0x514] = 0xc0, [0x534] = 0xc1, [0x52c] = 0xc2, [0x51c] = 0xc3,
+	[0x500] = 0xc4, [0x53c] = 0xc5, [0x55e] = 0xc6, [0x55f] = 0xc7,
+	[0x55a] = 0xc8, [0x554] = 0xc9, [0x569] = 0xca, [0x566] = 0xcb,
+	[0x560] = 0xcc, [0x550] = 0xcd, [0x56c] = 0xce, [0x567] = 0xcf,
+
+	/* Dx */
+	[0x568] = 0xd0, [0x564] = 0xd1, [0x565] = 0xd2, [0x559] = 0xd3,
+	[0x558] = 0xd4, [0x552] = 0xd5, [0x553] = 0xd6, [0x56b] = 0xd7,
+	[0x56a] = 0xd8, [0x518] = 0xd9, [0x50c] = 0xda, [0x588] = 0xdb,
+	[0x584] = 0xdc, [0x58c] = 0xdd, [0x590] = 0xde, [0x580] = 0xdf,
+
+	/* Ex */
+	[0x21e] = 0xec, [0x229] = 0xef,
+
+	/* Fx */
+	[0x261] = 0xf0,                 [0x265] = 0xf2, [0x264] = 0xf3,
+	[0x320] = 0xf4, [0x321] = 0xf5,                 [0x248] = 0xf7,
+	/* skipped */   [0x219] = 0xf9,                 [0x21a] = 0xfb,
+	[0x07f] = 0xfc,                 [0x5a0] = 0xfe
+};
+
+/** Decode character from code page 437 8-bit code.
+ *
+ * Note that this function considers all code page 437 members as graphic
+ * characters (including those in range 0-31), not control characters.
+ *
+ * @param code 8-bit code
+ * @return Character
+ */
+char32_t cp437_decode(uint8_t code)
+{
+	return cp437[code];
+}
+
+/** Encode character to code page 437 8-bit code.
+ *
+ * Note that this function considers all code page 437 members as graphic
+ * characters (including those in range 0-31), not control characters.
+ *
+ * @param c Character
+ * @param code Place to store 8-bit code
+ * @return EOK on success, EDOM if character cannot be encoded to CP437.
+ */
+errno_t cp437_encode(char32_t c, uint8_t *code)
+{
+	uint8_t b;
+
+	/* Unicode character 0 is the only that can map to cp437 code 0 */
+	if (c == 0) {
+		*code = 0;
+		return EOK;
+	}
+
+	b = 0;
+
+	/*
+	 * The map is split into two parts, 0x0000 - 0x0400 and
+	 * 0x2000 - 0x2700. This seems like a reasonable compromise
+	 * between complexity and memory efficiency.
+	 */
+
+	if (c < 0x400)
+		b = u0xxx_to_cp437[c];
+	else if (c >= 0x2000 && c < 0x2700)
+		b = u2xxx_to_cp437[c - 0x2000];
+
+	/*
+	 * If we got zero, it was an uninitialized entry (since no Unicode
+	 * character except 0 can map to b == 0 and that was already
+	 * taken care of).
+	 */
+	if (b == 0)
+		return EDOM;
+
+	*code = b;
+	return EOK;
+}
+
+/** @}
+ */
Index: uspace/lib/codepage/test/cp437.c
===================================================================
--- uspace/lib/codepage/test/cp437.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/test/cp437.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2021 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <codepage/cp437.h>
+#include <pcut/pcut.h>
+
+PCUT_INIT;
+
+PCUT_TEST_SUITE(cp437);
+
+/** Encode(decode) == identity */
+PCUT_TEST(decode_encode)
+{
+	unsigned code;
+	char32_t c;
+	uint8_t cdec;
+	errno_t rc;
+
+	for (code = 0; code < 256; code++) {
+		c = cp437_decode(code);
+		rc = cp437_encode(c, &cdec);
+		PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+		PCUT_ASSERT_EQUALS(code, cdec);
+	}
+}
+
+/** Test limit encoding cases */
+PCUT_TEST(encode_cases)
+{
+	uint8_t code;
+	errno_t rc;
+
+	/* Zero maps to zero */
+	rc = cp437_encode(0, &code);
+	PCUT_ASSERT_ERRNO_VAL(EOK, rc);
+	PCUT_ASSERT_EQUALS(0x00, code);
+
+	/* Last entry in the 0x0000-0x03ff table is unmapped */
+	rc = cp437_encode(0x3ff, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+
+	/* 0x0400 is out of range of first table */
+	rc = cp437_encode(0x400, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+
+	/* 0x1fff is before start of 0x2000-0x26ff table */
+	rc = cp437_encode(0x1fff, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+
+	/* First entry in 0x2000-0x26ff table is unmapped */
+	rc = cp437_encode(0x2000, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+
+	/* Last entry in 0x2000-0x26ff table is unmapped */
+	rc = cp437_encode(0x26ff, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+
+	/* 0x2700 is beyond the end of 0x2000-0x26ff table */
+	rc = cp437_encode(0x2700, &code);
+	PCUT_ASSERT_ERRNO_VAL(EDOM, rc);
+}
+
+PCUT_EXPORT(cp437);
Index: uspace/lib/codepage/test/main.c
===================================================================
--- uspace/lib/codepage/test/main.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
+++ uspace/lib/codepage/test/main.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2021 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <pcut/pcut.h>
+
+PCUT_INIT;
+
+PCUT_IMPORT(cp437);
+
+PCUT_MAIN();
Index: uspace/lib/meson.build
===================================================================
--- uspace/lib/meson.build	(revision c21cc26f3786e218650cb260107b00862470ac5c)
+++ uspace/lib/meson.build	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -57,4 +57,5 @@
 	'block',
 	'clui',
+	'codepage',
 	'compress',
 	'cpp',
Index: uspace/srv/hid/output/meson.build
===================================================================
--- uspace/srv/hid/output/meson.build	(revision c21cc26f3786e218650cb260107b00862470ac5c)
+++ uspace/srv/hid/output/meson.build	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -28,5 +28,5 @@
 #
 
-deps = [ 'drv', 'fbfont', 'pixconv', 'ddev' ]
+deps = [ 'codepage', 'drv', 'fbfont', 'pixconv', 'ddev' ]
 src = files(
 	'ctl/serial.c',
Index: uspace/srv/hid/output/port/ega.c
===================================================================
--- uspace/srv/hid/output/port/ega.c	(revision c21cc26f3786e218650cb260107b00862470ac5c)
+++ uspace/srv/hid/output/port/ega.c	(revision 9b2e20c0a5eabb2e6c8d5c488e41253a920dda59)
@@ -1,3 +1,4 @@
 /*
+ * Copyright (c) 2021 Jiri Svoboda
  * Copyright (c) 2011 Martin Decky
  * All rights reserved.
@@ -31,4 +32,5 @@
  */
 
+#include <codepage/cp437.h>
 #include <errno.h>
 #include <sysinfo.h>
@@ -106,8 +108,8 @@
 {
 	uint8_t glyph;
-
-	if (ascii_check(field->ch))
-		glyph = field->ch;
-	else
+	errno_t rc;
+
+	rc = cp437_encode(field->ch, &glyph);
+	if (rc != EOK)
 		glyph = '?';