IBM 1620 invalid character symbol

[Philippe Verdy via Unicode]

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 unicode.org>
:

> 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
>> http://www.bitsavers.org/pdf/ibm/1620/A26-5706-3_IBM_1620_CP
>> U_Model_1_Jul65.pdf
>>
>
> What page?
>
> Regards,   Martin.
>
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