Article-I.D.: mtuxt.545
Posted: Fri May  3 16:16:36 1985
Date-Received: Tue, 7-May-85 04:52:36 EDT
Organization: AT&T Information Systems, Holmdel NJ
Lines: 35

For those people who are trying to install 256K ram chips on the
motherboard of the AT&T PC 6300, the following may be of interest.

1) All motherboards support the 256K chips

2) some motherboards have sockets, others have all memory chips
  soldered.

3) you can install the 256K chips in either bank of memory.

4) the chips must be 150 nanoseconds.  You are on your own for
vendor type.

5) the switch settings are as follows:


on DIPSW-0 (the one closer to the center of the motherboard)

sw1	sw2	sw3	sw4	location
off	on	on	on	128k on motherboard
on	off	on	on	256k on motherboard
off	off	on	on	256K on motherboard, 128K on expansion board
on	on	off	on	256K on motherboard, 256K on expansion board
off	on	off	on	256K on motherboard, 384K on expansion board
on	on	on	off	512K on motherboard-in bank 0
off	on	on	off	512K on bank 0, 128K on bank 1 of motherboard
off	on	off	off	128k on bank 0, 512K on bank 1 of motherboard

other switch combinations are meaningless.
Look carefully at the DIPSW to determine which is "off" and which is "on".

If you unsolder memory chips to install 256K chips you do so at your own
risk.