CLUT / MEMCjr mappings
Counting from Top-Left of chip (with the ports farthest from you)
1 - S2.U1/SIO0
2 - S2.U3/SIO0
3 - S1.U1/SIO1
4 - S1.U3/SIO1
5 - S2.U1/SIO1
6 - S2.U3/SIO1
7 - S1.U1/SIO2
8 - S1.U3/SIO2
9 - S2.U1/SIO3
10 - S2.U3/SIO2
11 - S1.U1/SIO3
12 - S1.U3/SIO3
13 - S2.U1/SIO2
14 - S2.U3/SIO3
15 - S1.U2/SIO0
16 - S1.U4/SIO0
17 - S2.U2/SIO0
Counting from Left-Top of chip (with the ports farthest from you)
1 - S1.U3/SIO0
2 - S1.U1/SOI0
3 - U17/memcjr pin 40 - DQ0 - S1.U1/WIO0
4 - U17/memcjr pin 39 - DQ1 - S1.U1/WIO1
5 - U17/memcjr pin 38 - DQ2 - S1.U1/WIO2
6 - U17/memcjr pin 36 - DQ3 - S1.U1/WIO3
7 - U17/memcjr pin 35 - DQ4 - S1.U2/WIO0
8 - U17/memcjr pin 34 - DQ5 - S1.U2/WIO1
9 - DQ7 - S1.U2/WIO3
10 - DQ6 - S1.U2/WIO2
11 - gnd
12 - 5v
13 - linked to pin 86 U17/MEMCjr + U12/PrimeTime pin 39 <= 1Ohm - also to cpu A4
14 - linked to pin 85 U17/MEMCjr + U12/PrimeTime pin 40 <= 1Ohm - also to CPU A5
15 - linked to pin 23/ U17/MEMCjr + U12/Primetime pin 71 <= 1Ohm - also to CPU R/!W. Looks like traces are mid-board
16 - linked to pin 14/first dash on U17/MEMCjr <= 1Ohm
17 - gnd
Counting from Right-Top of chip (with the ports farthest from you)
1 - S2.U4/SIO0
2 - S1.U2/SIO1
3 - S1.U3/SIO1
4 - S2.U2/SIO1
5 - S2.U4/SIO1
6 - S1.U2/SIO2
7 - S1.U4/SIO2
8 - S2.U2/SIO2
9 - S2.U4/SIO2
10 - gnd
11 - 5v
12 - S1.U2/SIO3
13 - S1.U4/SIO3
14 - S2.U2/SIO3
15 - S2.U4/SIO3
16 - U17/MEMCjr pin 9
17 - gnd
Counting from Bottom-Left of chip (with the ports farthest from you)
1 - L7 / Video out
2 - L6 / Video out
3 - L5 / Video out
4 - gnd
5 - j13-b pin 3 from left
6 - 5v
7 - C25 negative
8 - C186 UNDERSIDE then to earth - debounce?
9 - R134 UNDERSIDE 500Ohm to gnd and c188 to gnd.
10 - gnd
11 - 5v
12 - R138 UNDERSIDE and R133 to gnd
13 - GOES TO A PAD ON UNDERSIDE NR R133/R137 - traces to R100/47-8Ohm goes to U19 / 343s0161 - looks like a custom chip - perhaps for clocks. Top-Left pin 1. Some rough info here:
https://elinux.org/Flameman/mac68k
14 - R137 UNDERSIDE / 297Ohm to gnd
15 - R90 UNDERSIDE to pin 4 MEMCjr through ~ 48Ohm resistor
16 - R88 Should go to pin 7 MEMCjr through ~ 48Ohm resistor
17 - 5v