@Gorgonops, ok thanks, will try that. I have another question about the ROM chip. it's a 128kx8, so it needs 17 lines of addresses in order to access the entire memory of the rom.…

Apple just did not make them public. They exist. The service guide is just for replacing parts - which is what is the most economical. The developer or technical notes may have mor…

ctrl-reset.

Thanks to all for the help.  I am going to do the software patch and roll in a 575 board with 128MBs of RAM, a crystal upgrade, and a full 68040 (is this the correct one?) CPU.  I …

@Elfen, very good suggestion, I would try that for sure. However, with no drive connected , it stays on "Check status device" and a kind of bar run from left to right and right to…

Gez!  How can I or anyone figure out a *real* 640 X 480 mod for the Color Classic then?  I think if i understood the analog board, I could beef up some components and make a safe u…

Not available

TheWhiteFalcon said: ...to boldly go where no one has gone before... Click to expand... Excellent Star Trek reference! [] ]'> As has probably been mentioned else…

Setup your gmail to use pop3 and use Eudora...

I wonder if this is for all the characters in the ROM or just a segment of them? Boot it up without the disk drives attached so it goes into AppleSoft Basic. Then type the follow…

You should be able to use the mobile site, I would think. Sometimes, you have to boldly go where no one has gone before, so...

So, I am still chicken about doing the VGA mod to my Color Classic.  But I am OK doing the software mod that will let me put a over clocked 575 logic board in my Color Classic. So…

techknight said: Your not gonna see via corrosion AFTER you already washed it. You needed to take note of those beforehand. Click to expand... That's why I'm having troub…

Hi... I need a schematic for a color classic analog board.  Where can I down load one or buy one? Thanks jack

Well it's hard to tell if it's the ROM chip or the Mega II. I also played around with the scope and followed the schematics, but I'm not able to pinpoint the root cause. Here they…

This happens if the ROM cant see the SWIM. grab the classic schematics and go throught it. Your not gonna see via corrosion AFTER you already washed it. You needed to take note of…

Thanks for the suggestion, I don't get a flashing ?, yet.  I removed the RAM card and it did not help, in a separate attempt, I removed the HD cable and the startup remains unchang…

As long as you got the flashing '?' inside a floppy disk icon, the Classic is or should be working. You got a Bong an you got video - that's 2 out of 3, which the third is booting.…

Could be the HD, try disconnecting it and booting from floppy

Its weird that only text is having a problem. That and the ROM checksum is passing. The only other chip I can suspect having a problem is the MEGA II which contains the character g…

I picked up a Mac Classic (2MB, 40MB HD) and it was immediately subjected to a recap.  As part of that process, I cleaned around the old cap areas with alcohol and re-tinnned the p…

It actually looks like what my vision does to me, from time to time. lol. But I digress.... double data = missing upper address bit/select signal on character ROM. 

And it can run my Leopard developer preview!

I do actually have one of these floating around somewhere in one of my stacks, might actually do just that!

Elfen said: If it were a Mac SE/30, I'd say part of your video circuit has lost a couple traces. Click to expand... Something like this would be my guess as well. I don't…