The Museum of HP Calculators

HP Forum Archive 20

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9815A/S option ROM
Message #1 Posted by Joel Setton (France) on 8 Mar 2011, 12:43 p.m.


The option ROM which is built into the 9815 CPU board seems to contain some new instructions which are accessed via I/O select code 7. These are probably documented in some manual, but where? Has anyone seen this manual, or experimented with these new instructions?

Many thanks to all!

Joel Setton

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