; MIRRHEX routine rearranges a 8 bit byte in ACC into its mirror image and returns the result in ACC. 
;Can be used in all places where the LSB to MSB tracks are inverted (by mistake!!).

	MIRRHEX:   	MOV DPTR, #INV_HEX
			MOV MIRHEX1,0FFH
			MOV MIRHEX2,A
	CHKLUP:    	INC DPTR
			INC MIRHEX1
			MOV A, MIRHEX1
			SUBB A, MIRHEX2
			JNZ CHKLUP
			MOV A, #0
			MOVC A, @A+DPTR
			RET

; Look up table for Inverting a HEX byte to get the mirror of the original one
; Used in DAC routine as the current PCB has LSB and MSB inversion by mistake.

	INV_HEX:   	DB 0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240,8,136
	    
			DB 72,200,40,168,104,232,24,152,88,216,56,184,120,248,4,132,68,196

			DB 36,164,100,228,20,148,84,212,52,180,116,244,12,140,76,204,44

			DB 172,108,236,28,156,92,220,60,188,124,252,2,130,66,194,34,162

			DB 98,226,18,146,82,210,50,178,114,242,10,138,74,202,42,170,106

			DB 234,26,154,90,218,58,186,122,250,6,134,70,198,38,166,102,230

			DB 22,150,86,214,54,182,118,246,14,142,78,206,46,174,110,238,30

			DB 158,94,222,62,190,126,254,1,129,65,193,33,161,97,225,17,145

			DB 81,209,49,177,113,241,9,137,73,201,41,169,105,233,25,153,89

			DB 217,57,185,121,249,5,133,69,197,37,165,101,229,21,149,85,213

			DB 53,181,117,245,13,141,77,205,45,173,109,237,29,157,93,221,61

			DB 189,125,253,3,131,67,195,35,163,99,227,19,147,83,211,51,179

			DB 115,243,11,139,75,203,43,171,107,235,27,155,91,219,59,187,123

			DB 251,7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247

			DB 15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255