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Miguel,

you can find the content here:

http://www.synack.net/~bbraun/roms/

Good luck.

Thank you.

Finally got to read the ROM as W27c256.
 
I Wrote a new EEPROM with the content of the chip and the linked file above and the problem persists, the ROM working fine.

the ROM isnt the issue, it never was... 

Was only for discat things and because I was bored ;D

One more question:

This issue is compatible with VRAM?

Yep

Paralel said:

Yep

Click to expand...

okey!

I would like to confirm this before I have to unsolder the VRAM chips and having to buy new ones.
 
It seems that there is a software of diagnosis called "MacTest is / 30 '' (http://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Companies/Apple/Documentation/Apple%20Technical%20Information%20Library/a2til197.txt) that it can help diagnose this problem.
 
The question now is where I can get this disk image.
 
Thank you.

Miguel,

I think the software you are looking for is for the Apple TechStep tool... was supplied to Apple technicians, but is a rare beast today:

Thanx Luis

Is rare found it but I'm sure that anybody has preserved.

Other diagnóstic tool is wellcome.

Some are availlable around, including among the folks here at 68Kmla, but is quite expensive if you can find one.

Also, is working with cartridge type "ROM Packs" and you should have the one suitable for your computer.

You will find information here:

http://www.forcedperfect.net/hardware/other/techstep/

Never seen one for real by the way.

With the disk image that indicated above would suffice.

This work has served to rule out a failure of VRAM:





I guess the next step is to replace the video muxes F253, .. or am I losing my time and money?  

PALs PALs PALs.... 

I guess this context was lost in translation somewhere? 

In fact. As I told the translator translates, "FRIENDs, FRIENDs, FRIENDs"
 
If I'm not mistaken there are at least 5 custom chips ...
Would you be so kind as to be a little more specific?

P.A.L. = Programmable Array Logic. Your translater shouldn't have any trouble with this!

c

Hahaha, of course, my translator and I know the meaning. I was just kidding
 
Thank you anyway.

Of course. We're all friends here! :lol:

By the way: I meant translator. Not translater.

c

after all its not like TK knows what he is takin bout or nothin  haha

I do not understand his slang phrase, but I guess the meaning.
Translators still have their limitations.
 
I Only try to exhaust all possibilities before having to pull my PCB because I can't no replace some components that are impossible to get.
 
This to You seem to have it easy and should also be the solution for you. 
On the other hand I should clinging to any possibility. 
Not know if you understand this.
 
So the next thing I will do is replace the video muxes and we will see what happens. The hope is the only thing to be not missed.

ok, sounds like your enjoying your self.  Personally if i know the piston is shot in my engine, but i start by changing the transmission … well hey all in good fun.!

I don't know if my car is wrong the engine or transmission, no one tells me anything clear, only receive invitations to carry the car to the workshop. But if I ask for parts to the "mechanics" say that they do not have, this is curious...
 
Of course I enjoy all this,  Do not you just that?
 
I think that it is not so crazy to think that failure can be the video muxes. But if I am wrong I invite to someone do a reasoning about this.
 
Enjoy it!!

The reason for this is most people who would fix it would scrounge up the pieces if needed to do the repair, but they're not going to go scrounging up pieces just to sell them to someone, that's way too much work for what the part alone would be worth, not to mention that the part in question may not be the cause, so they can go further if necessary to get the right solution. If you're willing to pay a rather perverse price for a piece that may or may not fix your problem, I'm sure you can find someone that can scrounge one up for you, but you would have to be willing to accept all the risk of installing the part and accepting that the part itself may not be the solution to your problem.

Thank you Parallel, but should look more at the productive part of this issue, not to disqualify and be more constructive.
 
I'm not begging for parts, I only say that I am surprised that there are people that says know the root of the problem and offering me a freePCB repair service and then tell that they can not provide me the parts needed to replace them myself. This is at least suspicious. I Do not say this for uniniserver, of course.
 
Be construtive, please.

yeah like fallen… i am sure he would send you the PALS?  

sounds to me like you are enjoying your self… as i said…  you can de-solder and re-solder every chip on there… it doesn't matter… but if you want to fix it..

then you will need to change out those PAL's … or there is a dead trace to one of them!!  that could be too i think.  but by all means … have fun.

that is what its all about…  I like your pictures.

ill send you pal's… but heck… i was thinking the other guy would be cheaper shipping to ya…  i can pull some and get you a price for shipping to spain...

Thanks unisever, that is, yes.

ok, i didn't know that was the problem…  ill get em on the way .  pm your address...

all packed up and ready to go.

You want to sent me a piece of PCB also bare?
I did not expect less from you. You are very kind.

huh?

1. i said i would send you the pal's

2. you didn't want the whole parts pcb

3. so i cut out that part for you including the IC/s Sockets, and that section of pcb so you could even trace lines.

4. i packed it up weighed it … and go you a price of 16 bucks to ship to you.

5. you wanted a picture.. so i took picture.

6. now you are sending me messages saying something about my foot in my mouth,and you are insinuating that i am sending you a bare pcb?

Ugh geez.. ok buddy.. hey have a nice one.