This information was posted by David Shadoff (daves@interlog.com)
and is mostly verbatim:
Notes:
(1) For reference, pin 1 is the short pin (on the left, if the card
is to inserted forwards), pin 38 is the long pin on the right.
(2) * - means I think this is what it is
** - means I don't know
(bar) - means it is an active-while low condition (usually denoted
by a bar over top)
(3) I'm telling you all I know (which really isn't much), and it may
contain errors, also - I will not be held responsible for errors
in this list. (or any damages resulting from the use of, or
inability to use, this information, etc...)
Pin Use
--- ---
1 ** 20 D4
2 ** 21 D5
3 A18* 22 D6
4 A16 23 D7
5 A15 24 CE (bar) - chip select
6 A12 25 A10
7 A7 26 OE (bar) - output enable
8 A6 27 A11
9 A5 28 A9
10 A4 29 A8
11 A3 30 A13
12 A2 31 A14
13 A1 32 A17
14 A0 33 A19*
15 D0 34 R/W (bar over W) - read/write
16 D1 35 **
17 D2 36 **
18 Gnd 37 **
19 D3 38 +5V