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DEL	INS	ERASE	CLEAR	BEGIN	PROC'D	AID	REDO	BACK		QUIT	● ●

! 1	@ 2	# 3	$ 4	% 5	^ 6	& 7	* 8	( 9	) 0	+ =
8→7	13→7	14→7	15→7	9→7	9→2	15→2	14→2	13→2	8→2	12→5
001, -INT7	101, -INT7	110, -INT7	111, -INT7	000, -INT7	000, -INT6	111, -INT6	110, -INT6	101, -INT6	001, -INT6	100, -INT3

↑

[

]

8→10

13→10

14→10

15→10

9→10

9→1

15→1

14→1

13→1

8→1

8→5

001, -INT9

101, -INT9

110, -INT9

111, -INT9

000, -INT9

000, -INT5

111, -INT5

110, -INT5

101, -INT5

001, -INT5

001, -INT3

←

→

{

}

;

ENTER

●

8→3

13→3

14→3

15→3

9→3

9→4

15→4

14→4

13→4

8→4

12→1

001, -INT8

101, -INT8

110, -INT8

111, -INT8

000, -INT8

000, -INT4

111, -INT4

110, -INT4

101, -INT4

001, -INT4

100, -INT5

SHIFT

↓

SHIFT

12→3

8→11

13→11

14→11

15→11

9→11

9→5

15→5

14→5

13→5

12→3

100, -INT8

001, -INT10

101, -INT10

110, -INT10

111, -INT10

000, -INT10

000, -INT3

111, -INT3

110, -INT3

101, -INT3

100, -INT8

ALPHA

LOCK

CTRL

●

FCTN

●

6→7

12→10

12→4

12→7

P5,-INT7

100, -INT9

100, -INT4

100, -INT7

The first pair of numbers below each key represents the pins that closing the key's switch will short - the number on the left is the output from the CRU [on the keyboard connector], and the number on the right is the input interrupt line [also on the keyboard connector]. If you're looking at the keyboard from the top, the pins are numbered left-to-right.

The second pair of numbers consists of a binary combination and an interrupt. This represents the combination of output bits P2, P3 and P4, and the interrupt line that will be triggered if the key is pressed at the same time. For example, for <SPACE>, "100,-INT4" means that P2 should be HIGH, while P3 and P4 are LOW, and, if depressed, interrupt line -INT4 will be triggered. Of note is the exception, ALPHA LOCK. This key doesn’t use P2, P3 orP4, but triggers an interrupt on -INT7 any time P5 is HIGH and the key is depressed.

- Brian Tristam Williams