Bis-Plus by MICRO-LUC cartridge schematic.
EPROM: 27C64.
U2: UCA6400

1 - nc
2 - U2/14, EPROM1, EPROM28, EPROM27, EPROM26
3 - to pin 2
4 - nc
5 - nc
6 - nc
7 - U2/5
8 - nc
9 - U2/6, U2/9, U2/10, U2/12
10 - NC
11 - EPROM22
12 - NC
13 - NC
14 - EPROM19
15 - EPROM18
16 - EPROM17
17 - EPROM16
18 - EPROM15
29 - EPROM13
20 - EPROM12
21 - EPROM11
22 - EPROM14, U2/7, RESET2

A - TO COMPONENT SIDE 1
B - NC
C - RESET1,U2/13
D - NC
E - NC
F - NC
H - NC
J - NC
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 - COMPONENT SIDE 22

OTHER:
U2/2 -> U2/1, U2/8