Re: Apple][+ RAM Card - How figure out total RAM ?

["Michael J. Mahon" <mjmahon@aol.com>]

myoldmac.net wrote:
> Hello,
>
> I have a language card installed into my Apple ][ Europlus.
> There are no notes about any RAM on it,
> but I can use a test program that finds RAM on the card to test.
> The program did not tell me any size of RAM.
>
> Because I have also a language Card with 16 Kbyte extra RAM in the
> shed I like to know:
>
> How many RAM is actually present on my Apple ][ Europlus ?
> Is there a way to get this information?

If it has a 16-wire ribbon cable jumper to the main board RAM area,
you can be almost certain that it is 16KB.

Look at the chips on the card.  There will be at least one row
of eight identical chip types (not necessarily all made by the
same manufacturer, though).

If they have a number like 4116 or 8116, then they are 16Kbit DRAMs.
If they have a number like 4164 or 8164, then they are 64Kbit DRAMs.
If they have a number like 41256, then they are 256Kbit DRAMs.

Multiply the number of rows of eight by the bit capacity of each
DRAM and that's the RAM capacity of the card.

For example, two rows of eight 4164 chips means a 128KB card.

-michael

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