rps@homxc.UUCP (04/06/87)
I need to populate a 1 year old PC6300 out to 640K, it currently has 256K in it. My question is: can I use 256K chips or must I use 128 or 64K chips? I believe it currently uses 64K chips to get up to 256K. If I use 256K chips, do I have to change some switch settings on the motherboard? Thanks, Russ Sharples homxc!rps
gpw@ihdev.UUCP (04/07/87)
640K ON MOTHERBOARD OF PC6300--------- Leave the first two banks of 64K DRAMs in place ... then put 256K DRAMs in the last two banks. Zap, you've got a 640K PC. 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 for 1.43 add sw 8 to 'off' if 256k chips are used 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. ------------------------------------------------------------------------ 256K chip sources: Microprocessors Unlimited PH# (918) 267-4961 24,000 S. Peoria Ave. Beggs, OK. 74421 Parts are new shipping is extra: $6.00 Fedx standard $15.00 FEDx next day Usual procedure is to call give a VISA or MC # and pay by check upon recipt of goods. They supply the envelope. Instructions on handling are provided, and must be followed for the warranty to be in force. ------------------------------------------------------------------------ -- George Wilkin AT&T Network Systems, Naperville, IL !ihnp4!ihdev!gpw IH 4A-157 work 312-979-4317