pc6300@mtuxt.UUCP (P.CABCD) (05/03/85)
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.
tsc2597@acf4.UUCP (Sam Chin) (05/05/85)
<> How many wait states does the 6300 have on its memory cycle? if any. Since it has an 8 Mhz 8086 and 150ns rams it would think about 1 wait state. Is that correct. Is it possible to remove that wait state if 120ns rams were used? Sam Chin allegra!cmcl2!acf4!tsc2597 tsc2597.acf4@nyu