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Texas Instruments Galaxy Junior

Date of introduction:  1988 Display technology:  LCD
New price:   Display size:  8 (5 + 2)
Size:  3.5" x 6.0" x 0.65"    
Weight:  4.0 ounces Serial No:  
Batteries:  2*LR44 Date of manufacture:  week 44 year 1988
AC-Adapter:   Origin of manufacture:  Italy
Precision:   Integrated circuits:  CD4816
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (DE: 5.4 MByte)

With the Galaxy Junior Texas Instruments introduced a simple calculator performing fractional arithmetic. You can use two different modes:

Euklid's division: 56 / 5 = 11 (Q)  1 (R)
Fractional division: 56 / 5 = 11_1/5

With the SIMP and F-D-key you can shorten results and convert between fractional and decimal display:

3_35/70 SIMP 3_1/2  F-D 3.5

Compare the Galaxy Junior with the Galaxy 10, the only difference is one key ! 

GalaxyJunior_1.jpg (105536 Byte)The Galaxy Junior started with the well known housing of the TI-30 Galaxy. Nevertheless it was a surprise to open two Galaxy Junior calculators manufactured in the same year in Italy. The construction was complete different! The first calculator (top on picture) uses a well known flexible printed circuit board (Flex-PCB) connecting the single-chip calculator-IC with the display and keyboard. Similar constructions could be found with the TI-55 II or the later TI-65. The second calculator (bottom on picture) demonstrated a different design using a rigid PCB with a connector to the keyboard and connected to the display. 
It looks simpler but seems to be more expensive - this one was the first design! 

Calculator IC found in the Galaxy Junior manufactured week 49 of the year 1987. The 1110484-0001 is the 7-digit Part Type identifier uses by Texas Instruments. GalaxyJunior_ICPROTO.jpg (10870 Byte)
Calculator IC found in the Galaxy Junior manufactured week 10 of the year 1988. Please notice the changes in the ROM-Code (1110484-0002 revision).
Calculator IC found in the Galaxy Junior manufactured week 24 of the year 1988.  GalaxyJunior_IC3.jpg (17437 Byte)
Calculator IC found in the Galaxy Junior manufactured week 44 of the year 1988 with the common CD4816 (TP0458) designation. 

The earlier of the two calculators uses a jumper to select between a "TI-10" and "TI-12", recently a Galaxy Junior replaced the "TI-12" with "TI Junior". Let's assume that the Galaxy Junior was designed as TI-12. In 1991 a well known TI-12 appeared, don't miss the Math Explorer.

The next calculator in line of the Galaxy Junior - the Galaxy 9x - uses the restyled housing of the Galaxy 67.


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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 5, 2001. No reprints without written permission.