Mapping of Keyboard Controller Input and Output – ROHS T2414A JH108PCB

Wanting to put an old Nintendo Entertainment System (NES) controller to “good” use, I dialed up some instructions for converting a standard NES controller with a serial cable to an NES controller with a USB cable.  The instructions recommended first extracting a keyboard controller from a working keyboard, and then wiring the NES controller buttons to the keyboard controller inputs. After removing a controller from an unused keyboard, I examined the circuitry for identifiable markings on the PCB.

KeyboardController

Finding three useful looking strings (ROHS, T2414A and JH108PCB), I searched online for information about the output of combinations of the terminals labeled R and C. Unable to locate anything, I decided to map the inputs and outputs myself. I was able to quickly record the output of the various combinations by placing one end of a jumper wire in an R terminal and tapping the C solder points one at a time. I ended up using a simple text editor for this task after difficulties using a spreadsheet program and wordprocessing program. In both of the latter programs auto-formatting features made the task of recording the outputs unnecessarily cumbersome. The table below shows what I found using a Macbook.

Input		Output
R0+C1		q
R0+C2		w
R0+C3		e
R0+C4		r
R0+C5		u
R0+C6		i
R0+C7		o
R0+C8		p
R0+C10		
R0+C11		Shutdown
R0+C9		F1
R0+C14		+
R0+C15		9
R0+C12		8
R0+C11		7
R0+C17		
R0+C16		
R0+C0		F2
 
R1+C1		Tab
R1+C2		Caps Lock
R1+C3		F3
R1+C4		t
R1+C5		y
R1+C6		]
R1+C7		F7
R1+C8		[
R1+C10		Delete
R1+C11		Shift
R1+C9		0
R1+C14		
R1+C15		6
R1+C12		5
R1+C11		4
R1+C17  
R1+C16		Command
R1+C0		Shutdown
 
R2+C1		a
R2+C2		s
R2+C3		d
R2+C4		f
R2+C5		j
R2+C6		k
R2+C7		l
R2+C8		;
R2+C10		\
R2+C11		Shift
R2+C9		
R2+C14		Down Arrow
R2+C15		3
R2+C12		2
R2+C11		1
R2+C17		Command
R2+C16		
R2+C0		0128
 
R3+C1		Escape
R3+C2		Help
R3+C3		F4
R3+C4		g
R3+C5		h
R3+C6		F6
R3+C7		a
R3+C8		'
R3+C10		
R3+C11		F11
R3+C9		
R3+C14		Up Arrow
R3+C15		.
R3+C12		0
R3+C11		Space 
R3+C17		
R3+C16		
R3+C0		Shutdown
 
R4+C1		z
R4+C2		x
R4+C3		c
R4+C4		v
R4+C5		m
R4+C6		,
R4+C7		.
R4+C8		\
R4+C10		Return
R4+C11		F12
R4+C9		a
R4+C14		F8
R4+C15		*
R4+C12		/
R4+C11		
R4+C17		
R4+C16		
R4+C0		Control
 
R5+C1		a
R5+C2		a
R5+C3		a
R5+C4		b
R5+C5		n
R5+C6		
R5+C7		
R5+C8		/
R5+C10		
R5+C11		
R5+C9		
R5+C14		Left Arrow
R5+C15		-
R5+C12		Right Arrow
R5+C11		Down Arrow
R5+C17		
R5+C16		
R5+C0		Shutdown
 
R6+C1		`
R6+C2		F1
R6+C3		F2
R6+C4		5
R6+C5		6
R6+C6		=
R6+C7		F8
R6+C8		-
R6+C10		F9
R6+C11		
R6+C9		000
R6+C14						
R6+C15		
R6+C12		Help
R6+C11		Delete Right
R6+C17		
R6+C16		F10
R6+C0		Control
 
R7+C1		1
R7+C2		2
R7+C3		3
R7+C4		4
R7+C5		7
R7+C6		8
R7+C7		9
R7+C8		0
R7+C10		F10
R7+C11		
R7+C9		
R7+C14		
R7+C15		
R7+C12		Shutdown
R7+C11		Shutdown
R7+C17		
R7+C16		
R7+C0		F5

Not all input combinations yielded an output. Where a letter, number or symbol was the output, it was recorded in the table. For the function key mappings I used an on-screen keyboard visualizer which is available in the OS X preference pannel under settings for the keyboard. A few input combinations outputted a string of numbers (see R3+C0 and R6+C9). While none of this information is super-exciting, I hope that by recording it here I might save someone working on a similar project some time and effort. Happy tinkering!

3 thoughts on “Mapping of Keyboard Controller Input and Output – ROHS T2414A JH108PCB

  1. Dude, you just saved my ass, i had mapped 10 keys, but was way too annoying for me to go on, and here you are, saving my day!

    thank you!

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