Re: SATURN 32K RAM BOARD

[mjmahon@aol.com (Michael J. Mahon)]

In article <fbb3caaf.0303191521.4e25d88c@posting.google.com>,
gabe123@freeshell.org (Max Smart) writes:

>"Redskull" <redskulldc@DESPAM.yahoo.com.au> wrote in message
>news:<fTWda.6046$L57.53631@news-server.bigpond.net.au>...
>> "Max Smart" <gabe123@freeshell.org> wrote in message
>> fbb3caaf.0303180855.213750c0@posting.google.com">news:fbb3caaf.0303180855.213750c0@posting.google.com...
>> > "Redskull" <redskulldc@DESPAM.yahoo.com.au> wrote in message
>>  news:<i5Bda.4437$L57.41352@news-server.bigpond.net.au>...
>> > > "Max Smart" <gabe123@freeshell.org> wrote in message
>> > > fbb3caaf.0303161311.5974b4@posting.google.com">news:fbb3caaf.0303161311.5974b4@posting.google.com...
>> > > > I have a Saturn 32k ram board for an apple ][+.  Can anyone please
>> > > > tell me how to use it.  It has a cable that also plugs into a ram
>> > > > socket on the apple ][ motherboard.
>> > >
>> > > Works exactly the same as a 16k language card except for:
>> > >
>> > > Selecting the different 16k banks is accomplished by accessing
>> > > C0N4 (first 16k bank)
>> > > C0N5 (second 16k bank)
>> > > when N is the slot number the card is in + 8.
>> > > ie. slot 0 = C084,C085.
>> > >
>> > > Larger saturn cards use C0N6,7,C,D,E,F aswell
>> > 
>> > > Red
>> > which ram socket do i plug the cable into.  It won't reach the one in
>> > the back corner.
>> 
>> What model Apple 2 are you trying to plug it into?
>> 
>> Red
>An Apple ][+.

That's good.  Any Apple later than the ][+ requires a different kind of
memory expansion card.

The 16-pin connector plugs into the "nearest" 16K DRAM chip socket,
after removing the DRAM, of course, and relocating it to the empty
16K DRAM socket on the 32KB card.  (Often, this socket will already
have a 16K DRAM in it, since the person who removed the card from
the system it came from didn't know enough to remove it and replace
it in the main board DRAM socket the card's jumper was plugged into.)

This hack provides the 32KB card with DRAM timing signals which
are not present on the slot connectors, and would otherwise have to
be generated on the card.  It was first used by Apple in the "Language
Card" 16KB card, which generally set the hardware standards for
memory expansion cards on the early ]['s--and the "chip jumper" hack
was one of the stunts that became semi-standard.

-michael

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