All the characters found in DOS (using charset=CP437):

A, a, à(…), á[*1], â(ƒ), Ä(Ž), ä(„), Å(�), å(†), α(à)    P, p, π(ã)
B, b, β(á)Q, q
C, c, Ç(€), ç(‡)R, r
D, d, δ(ë)S, s, ß(á), Σ(ä), σ(å)
E, e, è(Š), É(�), é(‚), ê(ˆ), ë(‰), ε(î)T, t, τ(ç)
F, f, Φ(è), φ(í)U, u, ù(—), ú(£), û(–), Ü(š), ü(�)
G, g, Γ(â)V, v
H, hW, w
I, i, ì(�), í(¡), î(Œ), ï(‹)X, x
J, jY, y, ÿ(˜)
K, kZ, z
L, lÆ(’), æ(‘)
M, m, μ(æ)Θ(é), Ω(ê)
N, n, Ñ(¥), ñ(¤)¿(¨), ¡[*2], «(®), »(¯)
O, o, ò(•), ó(¢), ô(“), Ö(™), ö(”)$, ¢(›), £(œ), ¥(�), ₧(ž), ƒ(Ÿ)

Instructions for getting á and ¡ characters in MS-DOS (CP437) using MS notepad:
*1 - to get á: Open notepad and enter "àA" and save in UTF-8. Open file as ANSI and look for "Ã A" string. The space in the middle can be cut and paste into notepad (in the ANSI mode) to provide the á character.
*2 - to get ¡: Open notepad and enter "íA" and save in UTF-8. Open file as ANSI and look for "Ã-A" string. The hyphen in the middle can be cut and paste into notepad (in the ANSI mode) to provide the ¡ character.