The TI1200 calculator uses a TMS0950.

chip top marked TMC0952NL ^7527
chip bottom marked K0952
die labeled 0950A 0952

9 7-segment LEDs (leftmost is just negative sign)
19 pushbuttons - 0-9, decimal point,
                 =, +, -, X, /, %, Clear, Clear Entry

TI1200 keypad layout
--------------------
        K1      K2      K4      K8
Seg F   C               %       /
Seg E   7       8       9       X
Seg D   4       5       6       -
Seg C   1       2       3       +
Seg B   CE      0       .       =

pinout
------
1  digit 7
2  digit 8
3  digit 9 (leftmost, segment G only)
4  9v battery negative
5  KP column 1 (left)
6  KP column 2
7  KP column 3
8  KP column 4 (right)
9  N/C
10 Segment DP
11 Segment G 
12 Segment F  / KP row 5 (top)
13 Segment E  / KP row 4
14 Segment D  / KP row 3
15 Segment C  / KP row 2
16 Segment B  / KP row 1 (bottom)
17 Segment A
18 connected to pin 19
19 68 cap to +, 68K resistor to -
20 +9v through switch
21 voltage divider for LED?
22 resistor to ground (reset?)
23 digit 1
24 digit 2
25 digit 3
26 digit 4
27 digit 5
28 digit 6

0/0 flashes the display 2.5 times per second