How much RAM in my II+ ?

[How much RAM in my II+ ?]

Well, minimally I'd like to get DOS running, and the ADTPro documentation says that can happen with only 48K, but it's not working for me - transfer seems Ok, so I do believe it is a memory limitation. (ADTPro calls this 'EsDOS][' - anyone know what the Es stands for? )

 

I found two different types of RAM in my machine - both are MOSTEK: MK4116J-3 IRL and MK4116N-3GP. I couldn't figure out the difference between 'J' and 'N'. The specs seem to show that '3' is for 200ns (oddly enough). I've ordered another 3GP, as those are the types in the bank missing the chip. And, I'm on the lookout for a language card.

 

Thanks again

[How much RAM in my II+ ?]

 

So your Apple ][+ almost has 48K. It had a Language Card at one time in it, because the RAM chip was removed and is most likely still in Language Card. You will need to replace that chip, to get the 48K of RAM because the entire Bank is non operational.. One Bit of each Byte is stored in each of the 8 chips. Look at the chips, they will have a number that indicates the Speed of the memory, my apple ][ has TI 200ns on its Language Card. The number, TMS4116-20 Indicates DRAM, 1 Bit width by 16K, at 200ns.

 

 

You can only use 32K of your RAM at this time.

 

 

ADTPro is run under ProDOS, which needs 64K.

 

 

MarkO

Super helpful. Thanks much MarkO (and Keatah)

[How much RAM in my II+ ?]

Hi all - I just purchased an Apple II+ and it has no language card. I know the stock II+ has 48K, but the RAM chip where you would normally connect the language card (top left if looking down on the mobo) is missing. Does this mean I only have 46K? Is there a way I can verify how much RAM is on my II+ ? I ultimately want to use ADTPro to load DOS, but I'm worried that this missing RAM chip may prevent me from doing that, or generally have some other problems. Thanks, Chris