Sad Mac code 02FF00

[mactjaap]

Testing a Mac Plus motherboard. It bongs, but gives a Sad Mac. Code 02FF00

I was looking at the page about Sad Mac, but I don't get it right.

http://www.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html

Is there anyone who can tel me how to read this error and what it is?

 

[mactjaap]

I now see that the RAM is missing. Probably this is a RAM Sad Mac.

 

[dochilli]

02 = Memory Test Bus subtest error

FF = G5 to G12 are missing (sum of all bits 0100 to 8000, hexadezimal).

I hope I am right...

Martin

 

[mactjaap]

It was the missing RAM. I switches RAM from an other Plus and it works.

However I would like to know how I could exactly read this 02FF00 error.

If I change RAM only for halve I get 02FFFF.

 

[mactjaap]

This is a nice article about missing or corrupt RAM. Fairly new to me but interesting.

https://ethandicks.wordpress.com/2013/10/07/adventures-in-retrocomputing-repairing-an-original-macintosh/

I have a RAM error on my Macintosh ED too. 022000. On the Sad Mac site this seems to point to location G10. Not sure how to read this on a DOVE MacSnap card....