Description: Singer Friden EC 1117 Desktop Calculator Nixie Tube Working This is the only calculator of this model available for sale online. Serial: 24000 The 1117 is one of the long-lived and successful line of Singer/Friden 111x-series of desktop electronic calculators. The span of the 111x-series covers four generations of calculator design. The first generation calculator in the line, the Friden 1112 utilized discrete transistor circuitry -- Integrated Circuits simply weren't practical for use in a calculator at the time this machine was designed. The next generation utilized early small and medium-scale Metal Oxide Semiconductor (MOS) Integrated Circuit technology. These machines were the 1113, 1114, 1115, and 1116 models. The third generation machines (the 1117 and 1118) utilized early Large-Scale Integration (LSI) sets of chips. The last generation of the 111x-series were the "A" version calculators (the only currently-known example being the 1117A), which utilized further advances in LSI technology to shrink the chip count from nine chips to only three.Nice Condition, some scratches as show in photos. Some tubes take a few minutes to fully power on, but they all work. Like all of the calculators in the 111x-series, the 1117 was designed and manufactured for Singer/Friden by the calculator division of the Japanese electronics giant Hitachi. The common core LSI devices present in both the 1117 and 1118 are the HD3201, HD3202, HN3202, HD3203, HD3205, HD3206, and HD3207. The HD3200-series chips were purposefully designed and built by Hitachi specifically for use in electronic calculating devices. The chips, when combined together in various ways, implement a microcoded engine specialized for performing binary coded decimal (BCD) mathematical operations, ranging from twelve to sixteen digits of capacity, as well as managing the data flow between the various chips. he only chip of these that I have been able to track down any information on at all is the HD3206, which is a general-purpose register chip used for holding the bits that make up the work registers of a calculating machine. The Friden 1117 contains two of these chips The 1117 uses the same arrangement for display of the sign of the number in the display, overflow, and memory status indication as the 1118 and 1117A. Three small neon indicators are situated at the right end of the display, with labels on the panel that indicate "NEG" (for negative number indication), "UDF" (for "UnDeFined"), which lights up in the event of an error or overflow condition, and "M1", which lights to indicate that the memory register has non-zero content. In the case of an overflow or error condition (for example, division by zero), the UDF indicator lights, and the input from the keyboard is ignored until the [C] key is pressed to clear the calculator.
Price: 799 USD
Location: Katy, Texas
End Time: 2025-02-06T15:27:41.000Z
Shipping Cost: 0 USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Brand: SINGER
Model: Singer Friden EC 1117
Country/Region of Manufacture: Japan
Vintage: Yes
