DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| Short pause
between Digits D9 and D1 of Display and Keyboard
Scanning Cycle of the µPD947 from a Royal 91K (Model UA122) manufactured in
September 1975 and captured with the Digilent Digital Discovery connected to the DCM-50A Platform. µPD947 Clock Frequency at 50 kHz.  |
| Complete Display and Keyboard
Scanning Cycle of the µPD947 from a Royal 91K (Model UA122) manufactured
in September 1975 pressing the [2] key (SB#K0) while displaying "2." and captured with the Digilent Digital Discovery connected to the DCM-50A Platform. µPD947 Clock Frequency at 50 kHz.  |
| Six complete
Display and Keyboard Scanning Cycles of the µPD947 from a Royal 91K (Model
UA122) manufactured in September 1975 and captured with the Digilent Digital Discovery connected to the DCM-50A Platform. µPD947 Clock Frequency at 50 kHz.  |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 2, 2025. No reprints without written permission.