Recent content by funnymike

A brief update: I finally got the machine up running again, by replacing the 341-0476 rom chip that contained the errors with an intel 27C010. Incredible to see that LCII motherboard working again after leaking caps and bad rom chips. Thanks so much for all of your kind help. :LOL:(y)

Wow! Thank so much for this gentle offer! The people here in this forum are so nice and always willing to help! But I live in Germany and most likely its not worth shipping the eeproms from the US to here. I suspect that I can find some cheap chips here as well! But thanks again!

I didn't dare to do that, since i didn't want to damage the "good" roms with a potentially damaged (because recapped) mainboard. However, i think I will follow Phipli's suggestion and spend few bucks for some eeproms. I will keep you updated!

I tried again (10 times), with the same result. Could it be a different Apple Rom? But it is highly unlikely that all differences are on one chip only.

Well that could be interesting: I could read all 4 chips, merged the binary code to one file and compared it to the LC-II.rom file, which is available under https://github.com/macmade/Macintosh-ROMs/blob/main/LC-II.ROM I have found numerous differing bytes, which are all originating from the...

Wow! Thanks so much, you are absolutely right! Now it can read the chip!

The programmer has arrived a couple of days ago. First thing i tried is to read the original apple mask roms, setting the reader to the 27C010 profile. However, I get pin errors: Bad Pin: #1 (ZIF Socket 1) Bad Pin: #31 (ZIF Socket 39) Do I need to reroute several pins of the mask rom or is the...

Those? https://de.aliexpress.com/item/4001194131805.html But I can't find information whether they support the 27C010 eeproms.

Thank you Max! Do you mean such a 70$ programmer https://www.ebay.de/itm/175842604933 ? Or are there even cheaper ones?

Yeah Yeah, i did that. I also used some electric contact spray. However, the signals of one of the four rom chips appear to be completely different than the others. Interestingly, this "bad" rom chip was manufactured by Samsung, while the three others are from Sharp. Does anyone know how I...

I finally figured out that the problem arises due to bad rom: I got a second well working Logicboard, put the rom from my first board in and it showed exactly the same symptoms like the first board. Changing it back to the working rom chips made the second logic board working again.

The voltages of the PSU are stable at 5 (or 4.95), -5, and 12V. I don't think its a PSU issue. The leakage of the caps appeared to me to be relatively fresh, so there wasn't to much corrosion and I cleaned it with IPA. Unfortunately I don't have an overview image of the board at hand right now...

Hi all, a few weeks ago I started an attempt to recap my fathers old LCII. Unfortunately, I didn't try to power it up before recapping, so I am unsure, if there has been another issue besides the leaking caps. With new tantalum caps, the board powers up and the fan continues to run. However, no...