Texas Instruments TI Programmer

chip top marked  ZA0675NL ATP 7806
chip bottom marked JP0983AT SINGAPORE
die labeled 0980B-83

9 7-segment LEDs (leftmost only has segments DP, B, G and F)
40 pushbuttons - 0-9, A-F, ., Off, On/C, DEC, HEX, OCT
STO, RCL, SUM, (, ), SHF, 1's C, AND, OR, XOR
CE, +/-, K, /, X, -, +, =

                        keypad layout
-------------------------------------------------------
          Pin  9  Pin  7   Pin  8  Pin  6   Pin 10
Pin 20      DEC     HEX     OCT     Off     C/On
Pin 12      STO     RCL     SUM      (        )
Pin 18      SHF      d       E       F        K
Pin 14     1's C     A       b       C        /
Pin 17      OR       7       8       9        X
Pin 16      AND      4       5       6        -
Pin 13      XOR      1       2       3        +
Pin 11      CE       0       .      +/-       =

Pin 1  - Digit 7
Pin 2  - Digit 8
Pin 3  - Digit 9 (only segments DP, B, G and F)
Pin 4  - N/C
Pin 5  - 9V battery -
Pin 6  - Keypad Column 4
Pin 7  - Keypad Column 2
Pin 8  - Keypad Column 3
Pin 9  - Keypad Column 1
Pin 10 - Keypad Column 5
Pin 11 - Keypad Row 1 / Segment DP
Pin 12 - Keypad Row 7 / Segment B
Pin 13 - Keypad Row 2 / Segment G
Pin 14 - Keypad Row 5 / Segment D
Pin 15 - Segment A
Pin 16 - Keypad Row 3 / Segment F
Pin 17 - Keypad Row 4 / Segment E
Pin 18 - Keypad Row 6 / Segment C
Pin 19 - N/C
Pin 20 - 9V battery + / Keypad Row 8
Pin 21 - N/C
Pin 22 - N/C
Pin 23 - Digit 1
Pin 24 - Digit 2
Pin 25 - Digit 3
Pin 26 - Digit 4
Pin 27 - Digit 5
Pin 28 - Digit 6

Output O PLA
11111110 0
10011000 1
11110011 2
11011011 3
10011101 4
01011111 5
01111111 6
10011010 7
11111111 8
11011111 9
10111111 A
01111101 b
01110110 C
11111001 d
01110111 E
00100111 F