DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
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) 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.
© Joerg Woerner, December 5, 2001. No reprints without written permission.