PAL20L10                                        PAL DESIGN SPECIFICATION
P7004                                              HARRY HUGHES 02/18/81
VIDEO LOGIC
MMI ENGLAND
CB2 CB3 CB4 CB5 CB6 CB7 BLK0 BLK1 G1 H1 H2 GND
H4 EN1 R G B X LOAD1 LOAD0 B0 B1 BLK VCC

IF (VCC) /LOAD0 = /B0* H1* H2* H4

IF (VCC) /LOAD1 =  H1* H2* H4*/B1
                +  H1* H2* H4* B1* B0

IF (VCC) /EN1   =  B1* B0

IF (VCC) /R     =  CB4* BLK1
                +  CB2* BLK0

IF (VCC) /G     =  CB5* BLK1 
                +  CB3* BLK0

IF (VCC) /B     =  CB6* BLK1
                + /CB2*/CB3* BLK0

IF (VCC) /X     =  CB7* BLK1

IF (VCC) /BLK   = /G1*/BLK1*/BLK0
                + /G1*/BLK0*/CB4*/CB5*/CB6*/CB7

FUNCTION TABLE

CB2 CB3 CB4 CB5 CB6 CB7 BLK0 BLK1 G1 H1 H2 H4 B1 B0 EN1 R G B X LOAD1 LOAD0 BLK

;CCCCCC   -BLANK-               E
;BBBBBB   BLK BLK   G  HHH  BB  N   R G B X   LOAD   BLK    COMMENTS
;234567    0   1    1  124  10  1             1  0
--------------------------------------------------------------------
 XXXXXX    X   X    X  HHH  HL  X   X X X X   H  L    X     LOAD0
 XXXXXX    X   X    X  HHH  LL  X   X X X X   L  L    X     LOAD1
 XXXXXX    X   X    X  HHH  HH  L   X X X X   L  H    X     LOAD1
 XXXXXX    X   X    X  LLL  HH  L   X X X X   H  H    X     EN1
 XXHXXX    X   H    X  XXX  XX  X   L X X X   X  X    X     R
 HXXXXX    H   X    X  XXX  XX  X   L X X X   X  X    X     R
 XXXHXX    X   H    X  XXX  XX  X   X L X X   X  X    X     G
 XHXXXX    H   X    X  XXX  XX  X   X L X X   X  X    X     G 
 XXXXHX    X   H    X  XXX  XX  X   X X L X   X  X    X     B
 LLXXXX    H   X    X  XXX  XX  X   X X L X   X  X    X     B 
 XXXXXH    X   H    X  XXX  XX  X   X X X L   X  X    X     X
 XXXXXX    L   L    L  XXX  XX  X   X X X X   X  X    L     BLK
 XXLLLL    L   X    L  XXX  XX  X   X X X X   X  X    L     BLK  
--------------------------------------------------------------------

DESCRIPTION
THIS PAL REPLACES ALL OF THE TTL LOGIC USED ON A VIDEO DRIVER BOARD (5 ICs)
TOGETHER WITH 4 PULL-UP RESISTORS.