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EDIT: Whoops, replied to something on the first page while thinking it was the last post. Ignore this, unless you still have problems with unstable CRT brightness. My guess is unstable voltage regulation on the analog board PSU. Did you properly remove all of the electrolytic leakage when you...

It's a quite high-hour FBT. The glue blob on top being this dark in color is a good indication. I may be wrong about this, but I think the more used a flyback transformer is, the higher chance it has of developing cracks and starting to arc internally.

Neat find! Also that fan install looks very pro.

I have attached a sound recording of my software-mix PT player port playing Jester's "My Glamorous Life" on a 7.09MHz Amiga 500 in WinUAE (cycle-accurate mode). I have disabled the Amiga's 4.4kHz low-pass filter to retain that sharpness that will most likely be present on a compact Mac. The Mac...

Yah, MOVEM would obviously give the best thruput, but I think it's hackish to put the lower byte (which can be any arbitrary value) of my 16-bit mixing buffer into the floppy drive motor speed register. :-)

I know, I was talking about moving the upper bytes from my own 16-bit mixing buffer to a data register. Huh? Isn't the audio output buffer on compact Macs 8-bit sequential bytes? So I think I'll have to do something like... MOVE.L (A0)+,D0 ; read two 16-bit samples from mix buffer (upper...

Ah nice. So if I understand it right I can use MOVEP.L (A0)+,D0 to store four high-bytes from my 16-bit mixing buffer to D0, then do MOVE.L D0,(A1)+ (where A1 points to the 8-bit audio buffer)? That's for sure a great optimization. Also yeah, I'll have to figure out how and at which point...

OK scratch that, I will try to support Mac Plus too, though I have a feeling that if it's fast enough on a SE, it may occasionally hiccup on a Plus.

Yeah, I'm worried it may not be fast enough on a 68k compact Mac, which would be a huge letdown, but I'll give it a try first before I conclude with anything at all. Though I'm only going to support Macintosh SE or newer, as I need all the CPU time I can get. I have some things in mind to...

Yes. I already made a 4ch 16-bit software-mixer for 7MHz 68000 Amigas using the original PT replayer, so I know it works. It mixed at around the same rate as the Mac version will use (22kHz). Not sure when I'll have something to show off, I'll need to set up some stuff on my Macintosh Classic...

At least #define can be used for inline asm, that is good enough for me (#define a block of code, repeat the definition N times inside the inline asm).

Thanks! That’s indeed nice and clean. No need for a separate assembler after all. Does it support the REPT directive for repeating a block of asm code?

OK, so THINK C 5 it is, but I need an assembler as well. I don't want to inline the whole mixer and replayer, and I want both of those to be in 100% assembler for minimal overhead.

Bumping this. I am going to port the ProTracker replayer to 68000 Macs one day, I just need to set up a development environment that compiles C code (for loader/GUI) and assembles assembly code (replayer/mixer), linking together the two into a single executable. Any suggestions for a dev setup...

Hm, interesting! So I guess the claim that it lacks dynamic focus is either not true, or that it doesn't matter in practice.

If the problem comes back, consider recapping the analog board. Yes I know, they very rarely need recapping on these Macs, but the caps are still way past their designated lifetime. It sounds a little like a capacitor issue to me; noise that goes away over time. But could be dried joints too of...

Good to know. I guess the lack of dynamic focus is the key here, if the person that said it is correct. But at the same time, unsharp corners is often a sign of a high-hour tube in general, so it's a bit confusing... Wish I had a CRT tester.

I lately got a Macintosh Classic that was mint on the inside with extremely little dust/sot, and the picture is bright with very minor blooming when I set brightness to max. I thought all of this was a sign of a non-high-hour CRT, but the image is a little fuzzy in the corners (like all classic...

Not really sure what causes it, but I'd look for cracked solder joints on the analog board (the one with the white protective plastic board on it). If found, they need resoldering.

Seems like normal SE audio behavior to me (loud audio, loud beeps, slightly quieter on other types of sound). The pops are also 100% normal. It's the voltage to the speaker being turned off, causing a sudden DC discontinuity. Happens after some sounds too. As ymk wrote, you can put a resistor...