Please help ident this unusual chip on a 128K Mac

[wiinky]

On Mac serial # F4111TZM0001, this odd chip sits adjacent to the CPU.

Any clue what it is?

 

[unity]

Nothing unusual at all. The exact name escapes me, but its part of being upgraded to a 512k. People could do two things, upgrade the RAM or swap boards.

 

[wiinky]

Ahhh ....

So what I have here is a 512k board sitting in a 128k serial numbered case.

Thanks for the information.

 

[unity]

Yup.

Which means the board may or may not be original to that exact machine at all. So while it was once a 128k board, its not a 512k. But some upgraders had several on hand ready to swap in. So when someone came in, they would pull the original board and swap in an already upgraded replacement.

You can downgrade if you want. But rumor has is the original Apple-logo branded RAM chips are pretty weak. So if you downgrade you will likely end up with new chips. You will have authenticity in RAM size only.

 

[uniserver]

it can be made back to an original 128k,  but would need that mod removed, and the ram would have to be changed back as well.

i happen to have replacement 128k ram here.

 

[wiinky]

Apple anthropology.

Mac M0001EK  [early kludge].

Thanks Gents

 

[wiinky]

Re: 512k interim upgrade.

Unity wrote:

"Which means the board may or may not be original to that exact machine at all. So while it was once a 128k board, its not a 512k. But some upgraders had several on hand ready to swap in."

Does look like an early mom n  pop interim solution.

 

[uniserver]

can we see a picture of the whole board?   is the ram in sockets?

 

[edibot42]

Is that board labelled "Zampino M512" by any chance?

 

[Mac In France]

Boards early 1984 are real 128 K, upgrades needed this "2nd floor"

Late 1984, Boards 128 and 512 are the same, only some chips more, so, no more "2nd floor", the design is included!

I need your assistance please: Is there anybody knowing which chip is the ram "F5" , I've got error code "Sad Mac 040001" with this kind of 2nd generation 128

and I would like to upgrade a 128K (design 630-0101) to 512, could you have any indication of the chips I do have to replace?

I could ask to uniserver, but I  realised that shipment  from France is same price as a new machine...

(apologise if I'm not "in the mood", it's my first Post...)

Happy New Year !!!

 

[unity]

Well F5 is the grid location on the board - row and column. Like the game Battleship. Look at the edges of the board and you will see these indicators. As for the exact chip, they can be purchased new but I do not have that information.

 

[wiinky]

can we see a picture of the whole board?   is the ram in sockets?

Thanks for your Reply.

RAM looks socketted.

I put more pics in my Gallery titled "Wiinky's".

https://68kmla.org/forums/index.php?/gallery/album/52-wiinkys/

 

[unity]

Nice. Week 11 is a pretty early unit. Even with an upgraded board, it would fetch a decent price on the market.