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Busicom Exec 121 DK
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| Brand: | Busicom , Nippon Calculating Machine (NCM) Corp. |
| Model: | Exec 121 DK. |
| Origin: | Japan. |
| Introduction: | 1972, this example was built in 1972 or 1973, based on datacode of main chips. |
| Type: | Basic desktop calculator with VFD display, AC operation, no battery support. |
| Functions: | 4-Basic function, constant and memory. |
| Display: | 12 individual VFD tubes of 8 segment plus decimal point each. One segment is used only for digit "4" to extend the horizontal bar. Also 3 red mini lamps for indication of Negative number, Overflow condition and Memory content. |
| Keyboard: | 23 big reed-switch keys, 1 sliding switch for decimal point selection (0 to 6 and 9 decimal digit), 2 switches for Round mode and M+/M- mode (see manual) , On/Off switch. This key opens the top cover of the display. You can power down the machine by pressing the top cover to the close position. |
| Main chips: | Two Mostek chips made for NCM identified as MK6018 and MK6019 with date codes 7209 and 7207 respectively. |
| Remarks: | A big machine with simple but attractive design with flip top display cover and retractable carry handle. A true desktop executive calculator of the 70's! |
| Size: | 9.45 x 6.30 x 2.36 in, 240 x 160 x 60 mm. |
| Condition: | (9/10) Very Good, no marks on casing, full working. Missing the feet to raise the machine. |
| Download: | Busicom Exec 121 DK Operator's Manual in English, click here. |
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