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

["myoldmac.net" <usenet@myoldmac.net>]

On Mar 13, 7:08 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
> myoldmac.net wrote:
> > On Mar 12, 5:01 am, "William Garber" <willy4...@garberstreet.com>
> > wrote:
>
> >>"Michael J. Mahon" <mjma...@aol.com> wrote in message9f2dnRW1JJFFM2nYnZ2dnUVZ_u2mnZ2d@comcast.com...:myoldmac.net">news:9f2dnRW1JJFFM2nYnZ2dnUVZ_u2mnZ2d@comcast.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.
>
> >>If it has this cable, then more than likely
> >>it also has an extra 4116 to dispell the one
> >>on the motherboard that is removed to install
> >>the cable into.
>
> >>William Garber
> >>Email Address - willy4...@garberstreet.com
> >>Alt. Email - willy4...@comcast.net
> >>Web address -http://www.garberstreet.com
>
> > Dear Michael,
>
> > thank you, I have this cable on the card and counted the modules on
> > the card - it seems that I have a 16Kbyte RAM Card.
>
> > Dear William,
>
> > right - there is an extra 4116 on the card.
>
> > But let me ask in general - for what is this language card used?
> > Is it a special version of RAM ?
>
> The 16KB card was designed by Apple to allow bank-switching RAM
> to overlay the built-in ROM space, which increases the amount of
> directly addressable to 60KB, with an additional 4KB of sub-bank-
> switched RAM (the 4KB from $C000..$CFFF is reserved for I/O).
>
> This creates what is referred to as a 64KB Apple II that can run
> ProDOS, Pascal, and many applications that can utilize the additional
> RAM space.  There are DOS versions that relocate themselves into the
> space of the 16K card, leaving additional memory under $C000 for BASIC
> to use.
>
> Look up the documentation for the card on the web for additional
> information on how to control the bank switching and write enabling
> if you want to use it from your own machine language programs.
>
> Although the 16K card (originally called the Language Card, since it
> was sold with Pascal and allowed the machine to more easily support
> languages other than BASIC) was developed for the Apple ][ and ][+,
> it became a _de facto_ standard, so when the //e and subsequent
> Apple II's were designed, the native 64KB was mapped in exactly the
> same way as the 16K card.
>
> -michael
>
> NadaNet networking for Apple II computers!
> Home page:  http://members.aol.com/MJMahon/
>
> "The wastebasket is our most important design
> tool--and it's seriously underused."

I have found a switch toggle on the keyboard encoder board,
I found it after removing the case top.
One can switch between "RESET" and CNTR (Control ?)

For what is that one... ?

Sorry, just leave me here in the rain if you get bored....
I have become close friend to my Apple //e´s,
but this is a bid of expanding my Apple II knowledge
and same time downgrading :-)

yours,
Oliver