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Texas Instruments TI-5315
Texas Instruments introduced with the TI-5315 in 1988 the unique combination of a printer-less 12-digit commercial desktop calculator with a built-in clock. Compared with the TI-3510 introduced almost 15 years earlier, added the TI-5315 much more functionality into a slightly larger package.
Dismantling the TI-5315 reveals a clean design centered around a NEC uPD75206 4-bit single-chip microcomputer.
Originally developed for VCR controller and similiar applications, matches the architecture of the uPD75206 perfect the requirements of the TI-5315:
The
printed circuit board (PCB) of the TI-5315 doesn't mention its manufacturer, but
the label on the backside of the calculator gives two hints:
Don't miss the database of all known UL-File numbers found on Texas Instruments calculators.
Texas Instruments continued the design language of the TI-5315 and introduced in 1989 the sibblings TI-5322 and TI-5332 sporting a printer but missing the clock.
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© Joerg Woerner, July 7, 2009. No reprints without written permission.