6300 Memory upgrade

[Jim Greenlee]

In article <7191 at topaz.RUTGERS.EDU> gopstein at topaz.RUTGERS.EDU (Richard Gopstein) writes:
>
>  A friend has an ATT 6300 with one floppy drive and one 10M
>hard disk purchased about a year ago.  The system came with 256K
>RAM on the motherboard, and he is interested in upgrading the
>system to 640K.  Unfortunately, he thinks that all of the existing
>chips (64K)? are soldered directly to the motherboard.  Did they
>really do this?  If so, what are his options?

This is not true. There are 2 banks - one is soldered-in 64K chips, the other
is socketed with (in his case) 64K chips. What he needs to do is buy 18 256K
DRAMS (150 ns access) and put them in in place of the socketed 64K DRAMS
which are presently installed. Then reset the DIP switches so that the system
sees the additional RAM on the motherboard. There should be a description of
the various DIP switch settings in the back of his User's Guide. The procedure
was also described in the December, 1985 issue of BYTE magazine in a product
review of the PC 6300.If he has trouble with the settings, let me know via 
e-mail and I will try to help. I know this will work because I did it for a 
friend of mine with an identical system about a month ago. The chips will 
cost about $60 or so mail order, and it takes about 30 minutes to do the whole 
job. While you're at it go ahead and get a NEC V30 and plug it in in place of 
the 8086 - the whole package makes a nice upgrade for only $75.

                                            Jim Greenlee

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