JOYCE keyboard layout

If a key is pressed the keyboard controller sends the number of the key pressed as well as the state of the key to the CPU. The CPU uses both values as an index into a translation table and determines the corresponding character value. The keyboard mapping may be changed using the utility SETKEYS. The other way of reading the actual mapping is not an easy task. The translation tables reside in different addresses based upon the current BIOS version.
I wrote two small assembler routines reading the character table:

Another option is to read a key by calling an XBIOS routine and filter control keys by number. If no control key was pressed simply write back the key number and state and read the character by regular BDOS call. A routine could look like this one:

;
; Routine reads a character from keyboard
;
; Carry flag is set if input available
; Accu holds character
;
	call	XBIOS		; Read key
	dw	00dah
	ret	nc		; No key pressed
;
; Analyze key number in reg C here.
; (E.g. cursor keys, number 6, 14, 15 and 79)
;
; If a key searched for will be found Accu must hold a
; value and the carry flag must be set
;
	....
;
; Carry on if no control key found
;
	call	XBIOS		; Rewrite number and state from registers B and C
	dw	00ddh
	ld	c,6
	ld	e,-1
	call	BDOS		; Read character
	or	a
	ret	z		; No character read
	scf
	ret

The keyboard is designed as follows:

Find the complete mapping of the keyboard here.
The control keys are defined as follows:

No.	Key	Hex value	Meaning in CP/M 3	No.	Key	Hex value	Meaning in CP/M 3
−	No value assigned			???	No meaning in CP/M 3
0	f4 f3	`0x11`	Next screen	15	←	`0x01`	Cursor left
1	RELAY	`0x12`	Left character into new line	16	DEL→	`0x07`	Delete character on the right
2	f2 f1	`0x1A`	End of file	18	RETURN	`0x0D`	End of line
3	PASTE	`0x17`	Recall previous line	20	EXCH FIND	`0x1D`	???
4	UNIT PARA	`−`	−	23	[+]	`0x16`	???
5	WORD CHAR	`0x06`	Cursor right	66	STOP	`0x03`	Warmstart
6	→	`0x06`	Cursor right	68	TAB	`0x09`	Tabulator
7		`−`	−	72	←DEL	`0x7F`	Delete character on the left
8	EXIT	(`0x1B`)	ESCape	73	f6 f5	`0x13`	Stop screen output
10	CUT	`0x14`	Writes character left to buffer	75	CAN	`0x08`	Cancel
11	COPY	`0x17`	Recalls previous line	76	[-]	`0x1C`	???
12	DOC PAGE	`−`	−	77	f8 f7	`0x10`	Toggle list output
13	LINE EOL	`0x06 0x02`	Cursor to start of line	78	ENTER	`0x0D`	End of line
14	↑	`0x1F`	Cursor up	79	↓	`0x1E`	Cursor down