Schematic of BB v. 1 CARTRIDGE

ROM used is 27256, but it's A14 is connected with Vcc, so it's used like 27128.

U2 is UCY7400 - 7400.
D1 is 1N4148 signal diode.
Resistors are 270R.

COMPONENT SIDE:
1 - nc
2 - EPROM1, U2/14
3 - To pin 2.
4 - nc
5 - nc
6 - nc
7 - R1/1
8 - U2/2,U2/6
9 - To pin 8
10 - R2/2
11 - U2/12
12 - nc
13 - nc
14 - EPROM19
15 - EPROM18
16 - EPROM17
17 - EPROM16
18 - EPROM15
19 - EPROM13
20 - EPROM12
21 - EPROM11
22 - EPROM14

SOLDER SIDE (pins counting right->left where PCB solder side with connector down facing you - if you still don't know how to count pins :) ):
A - RESET1, U2/7
B - U2/13
C - D1/K
D - nc
E - nc
F - nc
H - nc
J - EPROM26
K - EPROM2
L - EPROM23
M - EPROM21
N - EPROM24
P - EPROM25
R - EPROM3
S - EPROM4
T - EPROM5
U - EPROM6
V - EPROM7
W - EPROM8
X - EPROM9
Y - EPROM10
Z - EPROM20

OTHER:
R1/2 -> U2/5
R2/1 -> D1/A,U2/1 
RESET2 ->EPROM28, EPROM27
U2/3 -> U2/4
U2/9 -> U2/10 -> U2/11