As noted, why not just tap the frequency straight off the motherboard? It's right there. But whatever works for you. (And also, just have to ask... the specs for the propeller say…

I think the "16MHz" quoted for the Plus is probably nominal (ie near enough) and is actually 15.6672MHz Click to expand... Oscillators with a 7.8336 frequency and its multiples…

I think the "16MHz" quoted for the Plus is probably nominal (ie near enough) and is actually 15.6672MHz.Have you considered taking your clock straight from the Mac's onboard oscill…

Although I thought it did have a bit too many screws I didn't find it difficult to open up and get in.

I am in nashville, tn and I already have the ram maxed and leopard installed

Please do post your goodies. I'm not currently using any monitor larger than 17 inches on the 8600 but who knows what might happen in the future.

Interesting project MarkS. By coincidence, I've been reading the following similar projects in the last 24hrs: Prop-6502 laptop pPropQL020 and pPropQL I think the "16MHz" quote…

What does it do when you turn it on?

I have been able to hack the built-in video driver of my PowerMac 8500 to support 1920x1080 and 1680x1050 LCD panels perfectly (been using 1920x1080 for over a month now with zero …

The machine (240 V Classic - not II) has not been switched on for about 4 years and appears dead. I have opened up and can see the voltage on the inside of the mains switch but I …

The Apple II uses a 14.31818MHz crystal (4x color burst) which gives it the ability to generate pseudo-color video on a TV. Click to expand... And so did the original IBM PC, i…

Everything in a Plus runs off a single crystal which was chosen for compatibility with the SCC chip and standard baud rates. If you change the crystal, the Mac may beep and start, …

15.6+- khz is the time it takes to produce a single line on a NTSC tv, so the apple screen is probably really running at or near ntsc tv specs Also it was very common in the 80's t…

What was the reason behind the odd clock speed? Click to expand... It divides evenly (ie by integer) to generate baud rates. But I imagine the pixel clock was an important reas…

15.6+- khz is the time it takes to produce a single line on a NTSC tv, so the apple screen is probably really running at or near ntsc tv specs Also it was very common in the 80's …

Everything derives from the same clock. The frequency from the oscillator is divided in half for the processor and further for other IC's. The full clock speed is fed to the video …

If I were to swap out the oscillator, would it potentially damage the Mac? I doubt the .1664 MHz jump would hurt anything, but I want to make sure first. Click to expand... Ser…

I am working on a project with my Plus. The analog board is dead and while I do plan to fix it, I want to play around with a microcontroller. Anyway, One thing I'll need the microc…

The Mac II onwards were designed to use NuBus bus mastering for high speed data transfers. Both devices had to be on the NuBus, of course, and support bus mastering, at least as a …

Awesome! i loved those things. I used to have one. Try to find the floppy drive (and accompanying disk) that gives you 100KB floppy storage on a modern floppy. The floppy also ru…

Well, the thing went BANG, and my house RCD tripped (at least it tested that...), a nice smell of burning electrics coming from the power supply followed... Click to expand... …

Depends what condition it's in when it arrives. This will be my third CC. I would like to keep one stock, or stock-ish (ie a LC550/CCII motherboard swap, at most), and reserve th…

As far as I know, the first Mac to actually have DMA (which the very first IBM PC had) was the IIfx and it was only used under A/UX. Click to expand... The Mac II onwards were …

1) External drive must supply termination power (the power supply in the Plus is too feeble to do the job, so the design team decided that the external box should supply term power…

Too much paste is worse then none at all, even a little that gets stuck on the cache leads will short out a chip. Click to expand... yea if your using lead paste, ive never see…