Canon Multi 8 Calculator

Chip labeled 
TMC1079NL
KBSL^7726

24 buttons
2 switches
20-digit 7-segment VFD

TMS1000 pinout
1  R8   - digit 8
2  R9   - digit 9
3  R10  - switches and select upper/lower row of digits
4  VDD  - 
5  K1   - buttons
6  K2   - buttons
7  K4   - buttons
8  K8   - buttons
9  INIT - cap and resistor
10 O7   - segment D
11 O6   - segment E
12 O5   - segment F
13 O4   - segment G
14 O3   - segment A
15 O2   - segment B
16 O1   - segment C
17 O0   - segment DP
18 OSC1 - 68pF disc cap to VSS, 56K resistor to VDD
19 OSC2 - OSC1
20 R0   - digit 0 (right) -- swapped with 21
21 VSS  -                 -- swapped with 20
22 R1   - digit 1
23 R2   - digit 2
24 R3   - digit 3
25 R4   - digit 4
26 R5   - digit 5
27 R6   - digit 6
28 R7   - digit 7


Buttons
   R0   R1   R2   R3   R4   R5   R6   R7   R8   R9
K2  %    =    /    x    +    -   nc   nc   nc   nc
K4  .   RM   SC   CM  SQRT  M+   RV   nc   nc  CI/C
K8  0    1    2    3    4    5    6    7    8    9


Switches
    R10
K1 Memory
K2  AM

VFD
M 8. 8. 8. 8. 8. 8. 8. 8. 8.
* 8. 8. 8. 8. 8. 8. 8. 8. 8.

lower row leftmost digit
---  FFF
\|/  DED
---  GGG
/|\  DED
---  FFF

upper row grid connected to Memory/Single/Process switch:
disconnected in Single position

upper row leftmost digit M on when Memory/Single/Process switch
in Memory position