\ MEMORY DECODE PAL
\ PIVOT-2
\ 2/22/85
\ H. FULLMER

\ Revised 3/12/85 by M. Stolowitz to add Tri-State enables
\ 	for SRAM and LCM outputs.

\ Revised 3/12/85 for /MS instead of MS 

\ Revised 3/14/85 remove /MRD from /ROM vector fetch

\ 		P A L    T Y P E


PALS   16L8


\   	P I N    A S S I G N M E N T S

1.	/PS3+A2

2.	MWS

3.	/A5+A4

4.	NMI-RQ

5.	/SADEN

6.      /MS

7.	/PS4*ADEBL*A3

8.	A19

9.	A18

10.	GND

11.	A17

12.	/ROM

13.	/MRD

14.	/NMI-WR

15.	A16

16.	/SRAM

17.	A15

18.	A14

19.	/LCM

20.	VCC


\	E Q U A T I O N S




/ /NMI-WR	=    HI ( Tri-State Enable )
		\ NMI VECTOR FETCH
		+    / A19  *  / A18  *  / A17  *  / A16  *  / A15  *  / A14
		  *  /A5+A4  *  /PS3+A2  *  / /PS4*ADEBL*A3
		  *  / /MS  *  / MWS  *  / /MRD  *  NMI-RQ

		\ LATCH UNTIL NMI-RQ GOES AWAY
		+    / /NMI-WR  *  NMI-RQ


/ /ROM		=    HI ( Tri-State Enable )
		\ NORMAL ROM ACCESS
		+    A19  *  A18  *  A17  *  A16  *  A15  *  / /MS
		+    A19  *  A18  *  A17  *  A16  *  / A15  *  A14  *  / /MS

		\ NMI VECTOR FETCH
		+    / A19  *  / A18  *  / A17  *  / A16  *  / A15  *  / A14
		  *  /A5+A4  *  /PS3+A2  *  / /PS4*ADEBL*A3
		  *  / /MS  *  / MWS  *  NMI-RQ

		\ NMI STACK PUSH
		+    NMI-RQ  *  /SADEN  *  / /NMI-WR  *  / /MS  *  MWS


/ /SRAM		\ NORMAL SRAM ACCESS
		=  HI ( Tri-State Enable )

		+    A19  *  A18  *  A17  *  A16  *  / A15  *  / A14  *  / /MS

		\ NMI STACK PUSH
		+    NMI-RQ  *  /SADEN  *  / /NMI-WR  *  / /MS  *  MWS


/ /LCM		\ LCD MEMORY ACCESS
		=  HI ( Tri-State Enable )

		+    A19  *  / A18  *  A17  *  A16  *  A15  *  / /MS

END