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600 1973 |
835 1977 |
835A 1978 |
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Other Models not listed on this site but I have seen them (dates are mostly guesswork if "c" in front), four functions minimum is assumed |
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Model Number |
Date |
Features |
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200 |
c1978 |
8 digit VFD, square root, percentage, change sign, register exchange and four-function memory |
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200R |
c1978 |
Same as 200 but rechargeable batteries |
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201 |
c1978 |
Like 200, but scientific model |
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202 |
c1978 |
Like 200 but with financial functions |
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203R |
c1978 |
Like 200 but with square root, reciprocal and parenthesis |
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750 (NS750) |
1977 |
Same as 835 but a) Six digit display, b) "L" on the left to indicate overflow, c) no percentage key, d) no square root key, e) no memory |
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832 |
c1976 |
Same as 842 but square root, percentages, change sign, register exchange but no memory |
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842 |
c1976 |
8 digit red LED, square root, percentage and four-function memory |
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850 |
c1976 |
Same as 850A |
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850A (NS850A) |
1977 |
Same as 835 but a) no square root key, b) no memory |
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852 |
c1976 |
LED Scientific |
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900 |
1974 |
Same as 600, but white case |
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4525 |
c1977 |
aka "Scientist PR" LED, programmable scientific |
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4615 |
c1978 |
LED, programmable scientific, no exponent |
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4640 |
c1977 |
Same as 4615, 12+2 digit LED scientific |
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4650 |
c1975 |
Same as 852, 12+2 digit LED scientific |
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4660 |
c1978 |
Similar to 4615, scientific model |
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Mathematician |
c1975 |
LED Scientific |
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