| 摘要 |
PURPOSE:To enable the alteration of the reduction scale as desired, by registering several kinds of reduction scales of track and charts beforehand to alter the reduction scale by the operation of reading out any of those already registered. CONSTITUTION:A keyboard 1 has a reduction scale key, a reduction scale reading key, an input key, an expansion key, a reduction key. Given information is read into a CPU3 through an I/O controller 2 by the key operation to be memorized into RAMs 5 and 6. Then, by the key operation, desired several reduction scales are registered beforehand and any of the reduction scale data are read out as required to enable the altering of the reduction scale. Even when no desired reduction scale is registered, the reduction scale data close to the value is read out and by the operation of the reduction key or the expansion key, the computation of the reduction scale is done to alter it as desired in a short time.
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