Recent content by zoo

I have the exact same problem. Did changeing the VIAs solve it?

Not yet, I struggling to get my hands on the BU406D transistor and the 3.9t NP 100V H capacitor. I want to avoid working on the board twice. Update. It was the flyback anode connection that was indeed the problem. Thanks!

Different machine, any thoughts on that?

I have this flickering, it seems to be less pronounced once the computer has warmed up. Searched the dead mac scrolls but there was bo exact match, what is your opinion?

Quite leaky, but it had not eaten away anything (important) yet. But I have now replaced them and It was about time....

So, I got inspiration tonight and started the mod from Centris to Quadra following this thread https://tinkerdifferent.com/threads/marchintosh-2024-overclocking-a-centris-650.3387/ When it was time to install the 1.2kohm resistor it turns out that I didnt have any. I found a 1kohm resistor and...

We have been troubleshooting quite a fair bit outside the forum and we have not really figured it out. Either there is something seriously wrong with my machine or the ROM is really picky when it is a C650. I have however dug up the appropriate tools to change the gestalt ID to Q650. I'll get...

30 seems about right The chiming is intermittent, sometimes with a tune after and sometimes without. It sometimes tries to boot to desktop but hangs. But now suddenly a nights sleep and after the n:th pram reset it boots to desktop. And behaves normally, then I had to run so I couldn’t test...

Thanks. Flashed on a stock Q650 ROM, passing checksum. Seems to work great. Then flashed on this one https://github.com/CayMac-Team/UniversalROMImages/blob/main/LC475_LC575_Q650/LC475_LC575_Q650_BASE.ROM and it was a no go. That would suggest that the modified ROM does not like my Centris...

I got the 8mb CayMac ROM, Rominator and installed the Q650 ROM that I found here LC475_LC575_Q650_8MB_WITH_SYSTEM.ROM. But it is a no go, either I get a sad tune (or what it is called on the Quadras) or it is hanging on early in the system boot. Resetting is not doing anything, instead I need to...

I am excited to report that I just started up my IIfx that has been packed away for 20, maybe closer to 30 years. :) While I'm sure that you all don't really care about my IIfx, but I think you can relate to the feeling :-D

I won the auction, no other bidders. And it works fine, A/UX and all. Thanks for your feedback all, without it I wouldn't have dared to buy it.

Thanks. I agree. The 230MB original Apple drive points in the same direction. It was for the higher spec models. The ROM-socket is a funny one, since it is obviously running with it unpopulated it uses soldered on ROM. I wonder if I can just populate the socket with a ROM and it runs it from...

Found a Centris 650 online. I read on wikipedia that the base model does not come with fpu. But I want to run A/UX on it, how would I go about asking a seller about that? Or are there any good tells from the exterior that it has an fpu? Pictures in this ad here...

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