Math Marvel

28 SDIP marked TMC1986A-NL  DAS 8136  PHILIPPINES

9-digit VFD
24 buttons
piezo

                K8                K4              K2             K1
              Pin 10            Pin 9           Pin 8          Pin 7
Vss Batt+     Flash              ZAP             Off       On/Numberific
D5 Pin 27     Review           Checker          Quest             /
D6 Pin 26        7                 8               9              x
D7 Pin 25        4                 5               6              -
D8 Pin 24        1                 2               3              +
D9 Pin 23       Go                 0            Memory            =


1  D3 digit 2
2  D2 digit 1 (rightmost)
3  piezo
4  segment =
5  Rdd
6  Vdd batt-
7  K1 KP col 4 (right)
8  K2 KP col 3
9  K3 KP col 2
10 K4 KP col 1 (left)
11 filament
12 filament
13 segment A
14 segment F
15 segment E
16 segment D
17 segment C
18 segment B
19 segment G
20 Vss
21 Osc
22 Piezo
23 D9 digit 8 (leftmost) + KP row 1
24 D8 digit 7 + KP row 2
25 D7 digit 6 (symbol) + KP row 3
26 D6 digit 5 + KP row 4
27 D5 digit 4 (and = sign) + KP row 5
28 D4 digit 3


digits
   -       -       .       -       -           -       -       -   
 |   |   |   |   \ | /   |   |   |   |   -   |   |   |   |   |   |
   -       -       -       -       -           -       -       -             
 |   |   |   |   / | \   |   |   |   |   -   |   |   |   |   |   |
   -       -       .       -       -           -       -       - 
   8       7       6       5       4           3       2       1
   
segments
   A       A       A       A       A           A       A       A  
 F   B   F   B   F B F   F   B   F   B   =   F   B   F   B   F   B
   G       G       G       G       G           G       G       G             
 E   C   E   C   F E F   E   C   E   C   =   E   C   E   C   E   C
   D       D       D       D       D           D       D       D