Use the LEDs

How to Use the LEDs

LED availability

Here's a chart for the availability of the LEDs for the 4 machines

LED Name	F256 Jr.	F256 Jr.2	F256K	F256K2
Power	yes	yes	yes	yes
L0 status	yes	yes	yes	yes
L1 status	yes	yes	yes	yes
SD Card Access	yes	yes	yes	yes
Caps Lock	no	no	yes	yes
Network	no	no	no	yes

L0 and L1 are status LED on the board itself. (to do: state their normal purpose in this page)

System Control Register 0 at 0xD6A0

Here's the register that can let you assume manual control for the LEDs. In order to take control of a given LED, set the appropriate bit to 1.

Address	R/W	Name	7	6	5	4	3	2	1	0
0xD6A0	W	SYS0	RESET	NETW_LED	CAPLOCKS_LED	BUZZ	L1_LED	L0_LED	SD_LED	PWR_LED

System Control Register 1 at 0xD6A1

This register can control the behavior of the onboard L0 and L1 LEDs

Address	R/W	Name	7	6	5	4	3	2	1	0
0xD6A1	W	SYS1	L1_RATE1	L1_RATE0	L0_RATE1	L0_RATE0	SID_ST	PSG_ST	L1_MN	L0_MN

If L1_MN, L0_MN are set, they are under manual control. This allows to manually turn them on or off using the SYS0 register at 0xD6A0. If they are cleared, they will flash according to the L1_RATE and L0_RATE settings.

RATE1	RATE0	Rate
0	0	1s
0	1	0.5s
1	0	0.4s
1	1	0.2s

LED Color Registers

Set these RGB byte values for every LED other than L0 and L1. Note that these registers are Write only. The color will only change if you assumed manual control of these LEDs using the corresponding SYS0 system control register bits above.

LED Name	Red register	Green register	Blue register
Power	0xD6A7	0xD6A8	0xD6A9
SD Access	0xD6AA	0xD6AB	0xD6AC
Caps Lock	0xD6AD	0xD6AE	0xD6AF
Network	0xD6B3	0xD6B4	0xD6B5