Binary to Base Nine Conversion
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Del.icio.us| IP.com Number | IPCOM000073137D |
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| Dated | Nov 1, 1970 UTC | ||
| Size | 2 page(s) (54.2 KB) | ||
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Publication Summary
This circuit is arranged to access a circular tray type photographic slide projector under program control. A binary to nonary conversion as well as a nine times nine conversion back to binary for verification is provided.| Country | United States |
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| Language | English (United States) |
| Related Person(s) |
(AUTHOR) Muir, J |
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Binary to Base Nine Conversion
This circuit is arranged to access a circular tray type photographic slide projector under program control. A binary to nonary conversion as well as a nine times nine conversion back to binary for verification is provided.
The projectors are mechanically interlocked in such a manner that the tray must be accessed to the zero position in order to be removed or a new one installed. Installing a new tray is, therefore, always associated with resetting the address counters to zero.
There is one address counter 10 associated with the input from the Delta counter 12 and another counter 14 which senses the selection lines to the projector. With the tray at zero and the counters reset to zero, the first instructional move amount is an address.
The Input Address Counter 10 is an eight-bit counter wherein the low-order four bits are encoded to generate the group 22 of low-order nine select lines, and the high-order four bits are encoded to generate code for the group 24 of high- order nine select lines for accessing the projector. The high-order groupings 24 have assigned address changes which begin and end with multiples of eight. The end of each group is an odd multiple of eight and the beginning an even multiple of eight. Whenever bits 4, 2, and 1 as zero, the succeeding count is increased by seven.
The output of the two encoders is used to operate reed relays, not shown, whose contacts duplicate the selector switches of a manual remote co...