NJRoadfan said: According to the Apple IIgs Technical Reference, the character ROM is stored in the Mega II chip, not the main ROM. The Mega II is also responsible for genera…

Hmmm... Well I am not sure why anyone would remove the serial and FCC label. The FCC label I can see happening for some reason. But the serial. Its not easy to remove without resi…

Pitou said: @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 …

Where are the ROMs? I think it's not a prototype. I think it's a machine that has been through too many repairs and parts changes.

I doubt this is a prototype given that all of the stuff that is missing/different wasn't changed between the original and the 512k. It seems like this poor 512 just happens to be m…

Transplanting something like this requires considerably more work and modification than the VGA mod on a CC board.  CCs are not that rare and you could always keep a junker/spare C…

mraroid said: Let me start off by saying I am not a computer guy......  So this is probably why no one has done this before.  They know it will not work!  Click to expand.…

Any other differences from a production unit?

Have you considered taking the 575 components and mounting them in a custom case? That way you can make the front flat to mount an LCD? Your woodworking buddy could probably make s…

According to the Apple IIgs Technical Reference, the character ROM is stored in the Mega II chip, not the main ROM. The Mega II is also responsible for generating text screens on t…

No clue. Since they are two different brands maybe the driver software won't conflict with each other (if you run one at a time). Any reason you need 2 DOS cards in one machine?

the guy who figured out the 640x480 mod, I have no idea how he figured it out. Maybe it came from an internal apple employee, or repair guy. Hard to say. 

@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…

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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...

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…

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…