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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: 5.4M Bytes)

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 !

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.
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.
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.

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