Unknown 8085 opcodes

Charles Anthony charles.unix.pro at gmail.com
Wed Jan 11 11:19:39 CST 2017

On Wed, Jan 11, 2017 at 9:10 AM, Adrian Graham <binarydinosaurs at gmail.com>

> Hi folks,
> Any 8085 assembler geeks in the house?

A uProcessor geek, but not 8085 :(

However, Wikipedia mentions:

" Undocumented instructions

A number of undocumented instructions and flags were discovered by two
software engineers, Wolfgang Dehnhardt and Villy M. Sorensen in the process
of developing an 8085 assembler. These instructions use 16-bit operands and
include indirect loading and storing of a word, a subtraction, a shift, a
rotate, and offset operations.[7]

7. Dehnhardt, Wolfgang; M. Sorensen, Villy (January 1979). "Unspecified
8085 op codes enhance programming". Electronics. McGraw-Hill: 144–145. ISSN

-- Charles

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