Removing sixteen LEDs from the Console!10/31/2009
While sketching the Entry Switches registers, I realized that I don't really need dedicated LEDs for monitoring the internal DATA BUS. In fact, the L-BUS allows the operator to select whatever he wants to watch so I can simply let him select the DATA BUS as well, in the same way he selects any other register.
What I had named "REGISTER" (LEDs) now becomes the "DATA" LEDs. And what I'd named "DATA" (LEDs), simply disappear.
As per Entry Switches, I don't need to latch them during Debug Mode. The operator can treat the Entry Switches as any other register only that a manual change in the switches themselves will be reflected immediately.
For Programming Mode, I will introduce two specialized registers called "Programming Data Register" (PDR) and "Programming Address Register" (PAR). These registers will be used by sequencer circuitry located at the Console Controller Card for performing the memory data read/write cycles required during Programming Mode.
This new arrangement not only simplifies wiring (16 less connections!) but it also fits better within the overall design.
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Project start date: May 13 of 2009
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