HP-30S Scientific Calculator

[Gerald H]

On my 30S, SrNr 0230,

"Key in 1 [a b/c] 110 to put in 1/110 as a fraction via the [a b/c] key. The result is: 0/1. Or calculate 1/10-1/11 in fractional form, the result is 0/1.
But the internal value is correct (0.009090909..). Only the displayed rational value is wrong. Later production batches changed this behavior and under these conditions the machine only displays the irrational decimal value."

produces correct fraction.

"Now try 2+1e-9-2 = 0"

shows 0.000000001, ie correct.