The section named "KEYBOARD LED CONTROL" is out of date

[Rhialto]

Describe where we can find the problematic topic

The section is named "KEYBOARD LED CONTROL"

The example program uses old constructs like DEC("D61D") instead of the simpler $D61D. And also, the value set in D61E is only copied to the LEDs when D61D is written to, That's something the example program doesn't take into account. I just checked the VHDL and that confirmed my suspicion:

          when x"1d" =>
            disco_led_en_int <= fastio_wdata(7);
            disco_led_en <= fastio_wdata(7);
            disco_led_id_int(6 downto 0) <= fastio_wdata(6 downto 0);
            disco_led_id(6 downto 0) <= fastio_wdata(6 downto 0);
            disco_led_id(7) <= '0';
            -- Latch intensity level only when setting the register to write to.
            disco_led_val <= disco_led_val_int;
          when x"1e" =>
            disco_led_val_int <= fastio_wdata;

Poking into 1E sets an internal value. Poking into 1D copies this to an output signal.

Describe the solution you'd like

• replace DEC("....") by just $.....
• poke to $D61D after each case where $D61E is poked.

Describe alternatives you've considered
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Additional context
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