I would think that IF a platinum face plate exists from the original design it would be an ED model sold in Europe. Seems education models had the most variants over there. I almos…

@Elfen, oh I'm very sorry, I was talking about pins on the ROM, not the Mega II. Sorry again for the confusion.

Fair enough, I've never seen reference to a platinum original face plate or bezel and (sorry) am not convinced it exists, would love to be proved wrong (gives me another variant to…

Only in rumor and conjecture does an original face-plate design exist in platinum. Same for the original keyboard (without numeric pad). That is not to say they do not exist, just …

If you can get your hands on a polarized light source and the right optics, under polarized light conditions, a corroded trace should look different than a normal trace, even if th…

I think I can already answer this question BUT here goes. In my collection I have a Colour Classic and a Color Classic. As far as I know, same model numbers too but I will double …

The Ensoniq 5503DOC does not produce "classic" 8-bit Apple II sound. The clicker speaker logic is located in the Mega II. This is why when you use a stereo sound card, you don't ge…

Does anyone have any photographic evidence of the existence of this one: M0001D Macintosh 512ke (platinum color, original style face, no stamping on front) I can't say I have ever…

It might have been hot 25 or more years ago and they removed anything with a number not knowing the difference between serial and FCC labels. unity said: Hmmm... Well I a…

The address/data bus to the MegaII VLSI is dead on, otherwise you wouldnt be able to generate any legible characters.  The chip very well could be bad. But it would be odd, but no…

One of these days... when I get time... HAHAHAHAAHA.... I need to go through and compare the two analog boards and figure out the differences. 

Pitou said: I already checked all pins with an oscilloscope. Continuity is good. Signals seem to be on all pins except for 1,2,4 and 6 if I remember correctly. Again, I'm not…

Fix it please!

Funny http://www.ebay.com/itm/Vintage-APPLE-Macintosh-Classic-Model-MO420-Computer-With-keyboard-mouse-1991-/251961675256

I would date-code the analog board.

OK, good to know.  I just wanted to make sure I wasn't messing up a prototype before I started stealing parts.

Datecodes make it seem unlikely to be a prototype. The 512K was released in '84 but the IC date codes there are all from late 1985, such as 8547, 8543, 8598 and another 8543.

I already checked all pins with an oscilloscope. Continuity is good. Signals seem to be on all pins except for 1,2,4 and 6 if I remember correctly. Again, I'm not sure what to expe…

I had to review again a few times the video as the first few seconds as comes up scrambled on the old OSX 10.4 QuickTime. Now I see the start up screen come up scrambled but not re…

the one thing i do not like about the 640x480 mod, is the 47HZ refresh rate... i mean 60hz is bad enough. seems when i get mystified A/B's in the caps are extra cooked.           …

Well in theory only the mobo could be a proto. The rest would not be, just an unlabeled case.

This is something totally different. ProDOS-IIgs works with the windows and other things and all. So there is nothing wrong with the system at all. This is a software issue, looks…

There are two electrolityc capacitors on the inverter board, one is a 47uf 16V, the other is a 33uf 10V

I'll examine it more closely when I get home.  I couldn't see anything that was different, except for the text on the motherboard.  But I only have 1 other 512k to compare it to. …