The 8MB RAM on PDS slot for Macintosh Portable

[Hisashi Sasaki]

It's defective in memory.

 

[Hisashi Sasaki]

I set the 7MB RAM on PDS slot of Macintosh Portable M5126 (Backlit),Portable can't boot.

 

[Hisashi Sasaki]

Hello.

I get 4MB RAM card on RAM slot.

Now,My portable is running.

 

[Hisashi Sasaki]

Also , I am looking for 7MB RAM card on PDS slot forever.

 

[Hisashi Sasaki]

Why PDS slot memory card for M5120 don't move on M5126?

 

[CC_333]

They are different. One cannot put one in the other, and if you try, bad things can happen.

c

 

[tanaquil]

Huh, I thought someone earlier in this thread said they should be interchangeable. But I guess the OP's experience indicates otherwise.

 

[techknight]

5120 = Static RAM

5126 = Pseudo-Static RAM. 

Nope, original non-PDS cards are NOT compatible. 

 

[tanaquil]

But what about the PDS RAM cards?

 

[techknight]

But what about the PDS RAM cards?

5120 = Static RAM

5126 = Pseudo-Static RAM. 

Nope, original non-PDS cards are NOT compatible. 

 

[tanaquil]

Right, but CC_333 is saying that the PDS cards are also incompatible (look at the comment replied to). In your experience, is that correct?

 

[techknight]

Should not be. PDS cards have to generate their own timing and address decoding. So unless the SRAM is at a gross incompatible speed, it should be fine. 

and he probably didnt mean PDS. he meant the RAM slot. they are different between the two. 

 

[CC_333]

Yes, I meant RAM slot. PDS RAM cards are quite different, and my understanding is that some degree of interchangeability exists such that a single PDS RAM card should work in either Portable model.

c

 

[tanaquil]

The OP was asking why his PDS RAM cards aren't working. He was never asking about onboard RAM.

 

[techknight]

All my post was dictating was why 5120 and 5126 RAM cards are NOT interchangeable in the RAM slot. PSRAM requires a refresh signal which isnt present on the 5120. 

 

[Hisashi Sasaki]

I had heard that the PDS RAM card can use M5120 and M5126. But my PDS RAM card can use only M5120 and I don't use for M5126. I was surprised to know that.

 

[Hisashi Sasaki]

I have to look for the PDS RAM card for only M5126.

 

[Hisashi Sasaki]

If it's possible to load a memory card of 1GB on Macintosh portable, and Mac OSX can be installed, it'll be quite wonderful.

 

[Hisashi Sasaki]

I use MessagePad 2100 in work even now. If there is a memory 8 mb, it's possible to connect Macintosh portable and this newton in NCU.

 

[Hisashi Sasaki]

Please teach me how to use Ethernet on Macintosh portable.