please look at this sadmac error code!!

[gooddi]

Yes, but to clarify does this sad mac occur without floppy in the drive?

yep. there are not floppydisk in the drive.

so maybe its not reason for bad floppy disk.

thanks.

 

[uniserver]

Yes those ICs are compatible from the 512 K , The ram is also compatible if you change it all and of course you will only see 128k of it.

 

[gooddi]

I did replace the 74ls244 and then errorcode was chaged "020002".

so i also replaced the F6 Ram.

now it show the errcode "04FFFE".

 

 

[gooddi]

Since the 128 and 512 were same board when the 512 was introduced I would think so.

I did replace the 74ls244 and then errorcode was chaged to "020002".

(i guess your comment was right, it was broken 74ls244.)

so i also replaced the F6 Ram.

now it show the errcode "04FFFE".

 

[max1zzz]

did you replace both 74s244's or just one?

 

[gooddi]

did you replace both 74s244's or just one?

just one i replaced. which was near the cpu.

i have to replace one more ?

thanks for reading.

 

[uniserver]

Just tossing this out there, I'd say that I have re-Ram'd at least 14 128k's. and every single one of them had artifacts on the screen and A sad Mac. and every single one of them, re: ram was all that was needed, which in itself is insane amount of work that has to be done right and It has to be done carefully, it's very easy to cause yourself problems on changing those ram chips, got to be super careful, One board I took in a guy had already removed three ram chips and ripped out like four portholes it was very difficult for me to recover from that I had to run lines.

 

[uniserver]

I think maxes suggestion was more for Macdrone not really for The thread op

 

[max1zzz]

It was for both of them However it was aimed as a "if replacing all the ram fails" solution

yes there are 2, iirc they are the two chips immediately to the right of the CPU (assuming you have the side of the board with the ram closest to you)

But i would do what uniserver says first, replace all the ram.

 

[uniserver]

yah sometimes the sad mac codes can send you on a wild goose chase.  is best to just replace it all.

 

[Paralel]

Or just throw it out the window...

 

[gooddi]

here is some update.

i just got smile mac with nomal bong sound.

i had replaced the 10 ram and 1 74s244.

but actually 74s244 was not problem.

the problem was just ram only. more than 3ram was unnomal.

thanks for everyone's help.

have a good day!!

 

[Elfen]

Congrats on the fix.

 

[uniserver]

change the rest,   i personally do not like sockets.  if you do the ram right once its done, no need for sockets.

they cause more issue then good.

 

[gooddi]

Congrats on the fix.

thanks

 

[gooddi]

change the rest,   i personally do not like sockets.  if you do the ram right once its done, no need for sockets.

they cause more issue then good.

yep. socket make some issue actually.

ram was not just fit with socket, and sometimes i had to push the ram.

i will remove it all some day.

thanks.