IBM 1620 invalid character symbol

Philippe Verdy via Unicode unicode at
Tue Sep 26 08:34:15 CDT 2017

But what is interesting is the use of negative digits (-1 to -9, with the
minus sign above the digit; I've not seen a case of minus 0, not needed
apparently by the described operations)
How do you encode these negative decimal digits in Unicode ? with a macron
diacritic ?

2017-09-26 15:20 GMT+02:00 Martin J. Dürst via Unicode <unicode at>

> On 2017/09/26 22:03, John W Kennedy via Unicode wrote:
>> I don’t know what your snippet is from, but the normally authoritative
>> IBM manual, A26-5706-3, IBM 1620 CPU Model 1 (July, 1965) displays what is
>> clearly the Cyrillic letter. Whether it should be regarded as that, or as a
>> distinct character, is another question. See
>> U_Model_1_Jul65.pdf
> What page?
> Regards,   Martin.
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