| 1. | This Act replaced the " Data Register Act " of 1978.
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| 2. | TR6 was the test command register, and TR7 was the test data register.
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| 3. | The registers other than the instruction register are called TDRs or Test Data Registers.
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| 4. | The Memory Data Register ( MDR ) contains the data value being fetched or stored.
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| 5. | The third waits for a key press, and then stores it in one of the data registers.
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| 6. | A transponder equipped to transmit Comm-B replies is fitted with 256 data registers each of 56 bits.
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| 7. | Memory, implemented by an acoustic delay line, could be partitioned between program steps, constants, and data registers.
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| 8. | There may also be a memory address register and a memory data register, used to access the main computer storage.
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| 9. | In the original instruction set, all operations were memory-to-memory only, with no visible data registers.
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| 10. | Each card held two strips of 112 bytes each, that could hold 16 data registers or up to 112 program steps.
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