Title	  M25 BOARD COMPUTER
Pattern	  MEMORY ADDRESS DECODER
Revision  0.00


CHIP	U2	GAL16V8

;1]   [2]   [3]   [4]   [5]   [6]   [7]   [8]   [9]   [10]
A16   A17   A18   A19   MRQ   W     -     -     -     GND

;11]  [12]  [13]  [14]  [15]  [16]  [17]  [18]  [19]  [20]
-     -     -     WE    OE    VRE   IOE   RAM   ROM   VCC


EQUATIONS

/ROM	= A19 * A18 * A17 * A16 */MRQ	; Fxxxxh selected

/RAM	=/A19 */A18 */A17 */A16 */MRQ	; 0xxxxh selected

/VRE	= A19 */A18 */A17 */A16 */MRQ	; 8xxxxh selected

/IOE	= A19 */A18 * A17 */A16 */MRQ	; Axxxxh selected

/OE	=/MRQ * W			; Read strobe

/WE	=/MRQ */W			; Write strobe