Logic for 68008 lcd board


#	date		description 						by
--	--------	------------------------------------------      ----
01	10/05/13	initial version						BDJ

memory map:
rom	0x80000 - 0xc0000
ram	0x00000 - 0x20000
pit	0xe0000
adc	0xd0000

(c) Bas de Jong

CHIP  decode 20v8

;	1     2     3     4     5     6     7     8     9     10    11    12
	/map  a19   a18   a17   a16   fc2   fc1   fc0   nc    nc    nc    GND

;	13    14    15    16    17    18    19    20    21    22    23    24
   	nc    /ds   dack  /iack nc    nc    /adc  /pit  /ram  /rom  /as   VCC

@ues 68008lcd

EQUATIONS

rom	= /a19 * /a18 * /a17 * as * ds *  map +
	   a19 * /a18 * /a17 * as * ds * /map
ram	= /a19 * /a18 * /a17 * as * ds * /map

pit	=  a19 *  a18 *  a17 * /a16 * as * ds
adc	=  a19 *  a18 * /a17 *  a16 * as * ds

iack	=  fc0 * fc1 * fc2 * as

dack	= /a18 * as + adc