2764 to 2564 adapter  -  Reading only


ADAPTER  IS  FOR  READING  ONLY

That is:

1.  Program the 2764 EPROM in your EPROM programmer as a 2764.
2.  Insert 2764 EPROM into the adapter below.
3.  Fit adapter into 2564 socket on system board.


>

Socket for	Plug for
2764 ROM	2564 socket
(female)	(male)

[ 1] Vpp <------------------  [ 1] Vpp
[ 2] A12 <------------------  [23] A12  ( !!! different pin numbers )
[ 3] A7  <------------------  [ 3] A7
[ 4] A6  <------------------  [ 4] A6
[ 5] A5  <------------------  [ 5] A5
[ 6] A4  <------------------  [ 6] A4
[ 7] A3  <------------------  [ 7] A3
[ 8] A2  <------------------  [ 8] A2
[ 9] A1  <------------------  [ 9] A1
[10] A0  <------------------  [10] A0
[11] Q0   ------------------> [11] Q0
[12] Q1   ------------------> [12] Q1
[13] Q2   ------------------> [13] Q2
[14] Vss  ------------------  [14] Vss   (ground)
[15] Q3   ------------------> [15] Q3
[16] Q4   ------------------> [16] Q4
[17] Q5   ------------------> [17] Q5
[18] Q6   ------------------> [18] Q6
[19] Q7   ------------------> [19] Q7
[20] /E  <------------------  [ 2] /CS1  ( !!! different pin numbers )
[21] A10 <------------------  [21] A10
[22] /G  <------------------  [27] /CS2  ( !!! different pin numbers )
[23] A11 <------------------  [20] A11   ( !!! different pin numbers )
[24] A9  <------------------  [24] A9
[25] A8  <------------------  [25] A8
[26] NC                                (NC = not connected)
[27] /P  <---+                         (tying pin 27 of 2764 socket to Vcc)
             |
[28] Vcc <---+--------------  [28] Vcc