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Diagnostic LED Definitions

There are eight LED's divided into two felds of four on the back of the system box. These LED's provide feedback during each phase of power-up initialization and testing. The first four indicate the state of the system while the second four indicate substate and are dependent on the indication given from the state LED's.

State	Substate	Definition
1111	1111	Power is applies but no instruction is executed.
1111	0000	Power is applied. The ROM code is successfully started and several instructions have been executed.
1110	0000	Console memory sizing routine is entered. Memory to hold the console data structures is located. The substate variables have no meaning in this section of the test.
1101	0000	The console data structures are initialized and have started testing the NVR.
1100	0000	The NVR test completed and the DZ test has started.
1011	0000	The DZ test completes. An optional video has been found but its testing has not been started. This is part of the console determination code.
1011	0001	The DZ test completes. No optional video is installed or, if it is installed, fails self-test. In either case, the base monochrome video test has been entered.
1010	0000	The video subsystem was tested and the console initialization sequence was entered.
1001	XXXX	The system initializes and power-up testing starts. The substate variable indicates the subsystem test being excuted. See subsystem table below.
1000	XXXX	The self-test completes with the substate indicating the failing subsystem. See subsystem table below. Enter TEST 50 to see results.
0111	XXXX	Self-test was entered from the console TEST command. The substate indicats the subsystem test currently being executed. See subsystem table below. Enter TEST 50 to see results.
0110	XXXX	The self-test completes from the TEST command with the substate indicating the failing subsystem. See subsystem table below. Enter TEST 50 to see results.
0101	XXXX	The self-test started under control of the APT system. The substate indicats the subsystem test currently being executed. See subsystem table below. Enter TEST 50 to see results.
0100	XXXX	The system exerciser started from a console TEST command. The substate indicats the value of the lower four bits of the command. If the system exerciser starts with a T 101, the substate contains a 0x0001. Read the test results on the screen.
0011	0000	The system exerciser started under control of the APT test delivery system. Read the test results on the screen.
0010	XXXX	The entity-based module received a request from a host to enter monitor mode. This lets the host send commands to the system. This is indicated if the functionality of the EBM is implemented at a later release of the system ROM. Reserved for future use.
0001	XXXX	Console mode was successfully entered and is ready to accept commands. This does not apply to power on. The substate indicates the failing subsystem if there is one. This differs from a self-test complete, because the console can be entered by means other than TEST command or power-on halt (for example HALT button).
0000	XXXX	Attempting to boot the system. Once control passes to VMB, the state LED's have no meaning.

Subsystem Table
Substate	Subsystem	Substate	Subsystem
1111	MONO	1110	CLK
1101	NVR	1100	DZ
1011	MEM	1010	MM
1001	FP	1000	IT
0111	STRG-1 or SCSI-A	0110	SCSI-A or SCSI-B
0101	SYS	0100	8PLN
0011	(option)	0010	(option)
0001	NI

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