Try using '$+3' as the jump address instead of the defined label shown in the above example. This forces the PC to the next address (ie 3 bytes after the current instruction) if it passes the test - the same place it arrives at if it fails. Then test the carry state. This saves a label, and makes the instruction 'universal'.

        mov a,#6
        cjne a,ram_byte,$+3
        jc ram_byte_gtr_than_6
        ....                    ;ram_byte =< 6

ram_byte_gtr_than_6:
        ....                    ;ram_byte > 6

Alternatively, compile a set of macros like this:

;** -CJL	Compare and jump if X1 less than X2
CJL	macro X1,X2,X3
	LOCAL X0
	cjne X1,X2,X0
X0:	jc X3
	MEND

;** -CJGE	Compare and jump if X1 equal or greater then X2
CJGE	macro X1,X2,X3
	LOCAL X0
	cjne X1,X2,X0
X0	jnc X3
	MEND