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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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content/history/first-texas-instruments-ti-57-sales.md

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+---
+title: FIRST TEXAS INSTRUMENTS TI-57 SALES
+date: '1977-07-01'
+years:
+- '1977'
+topics:
+- Hardware
+params:
+  when: JULY 1977
+  image: /media/history/images/texas_ti57_system_1.jpg
+  oc_id: 29
+  source:
+    url: https://web.archive.org/web/20220322023408/http://www.old-computers.com/history/detail.asp?n=29
+    date: '2022-03-22'
+---
+
+![](/media/history/images/texas_ti57_system_1.jpg)
+
+The **TI-57**, **TI-58** and **TI-59** programmable calculators were revealed to the public in May of 1977. Sales of the TI-57 started in July, and in August for the TI-58 and 59 (as we will see next month).
+
+It will become the most sold programmable calculator in the world. Though inexpensive ($80), the TI-57 is a technological prowess. It is the only programmable calculator with all functions centralized in a single integrated circuit.
+
+A low consumption MOS/LSI circuit does the work of 30,000 transistors. It features a 4 bits microprocessor, 50 program steps in RAM and a ROM command software. A new coding method allows to save in one programming step up to three keys entries (as in : Inv-2nd-cos).
+
+All these characteristics are largely inspired by Hewlett Packard's latest products, HP being Texas Instrument's largest competitor in this area.
+
+The TI-57 will also be sold through **Radio Shack** under the name of **EC-4000**.\
+TI-57 production will end in 1982.
+
+![](/media/history/images/texas_ti57_ic_1.jpg)