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Nope, it’s the very first one. Probably by design.

So just out of curiosity I timed it. One test was with the Booster extension enabled (and booting to 400Mhz G3 and with the reboot), and one with extension disabled (and booting to 250Mhz 603e). All other aspects were unchanged. I was booting into OS 9.1, timing it from boot chime to...

Thanks, @macuserman. In case you couldn’t tell, this is your old machine. It’s been through a full regimen of disassemble, clean, retrobright, full recap, CRT adjustments, and now I’m just pimping it out. Provided hours of tinkering fun so far. The recap was intense, over 80 capacitors in...

Thanks for the replies. Yes, it does have a working battery and keeps time between power-downs, and the machine is rock solid with or without the accelerator. Sounds like this is probably intended behavior. It doesn't bother me, I've just never seen this before. Thanks again!

Hey all. I recently acquired an Interware Booster "6454" (G3 400Mhz/1MB) for my new PM5500. It works great and provides about 4 times the performance over the original 250Mhz 603e. The weird thing is, when you first boot the machine, it gets to the part when it starts loading extensions, but...

I updated my post - yeah it's v1.1a. I'll def look into ZuluSCSI. Thanks again.

Yeah, that's a good theory. Or possibly the PM 5500/6500 board is more strict/finicky about standards compliance, and other machines are more "tolerant". That might explain why the Apple-branded external CD ROM still works fine, but the (aftermarket hack) BlueSCSI (v1.1) does not. I might...

Thanks for the reply. Yes, the BlueSCSI DB25 has onboard termination. I also tried changing the SCSI IDs just in case (although I do know there should not be a conflict - the CD ROM is ID 3, and the IDE drive is irrelevant). Lastly, I tried other SD cards in the BlueSCSI. The oddest thing is...

Hi all, I'm experiencing a weird issue. When I plug in a my BlueSCSI DB25 drive to the external SCSI connector, the machine hangs on boot. Happy chime, but no icon, just a mouse pointer. I have 2 logic boards actually, one from the PM5500, which is completely recapped and one from a 6500...

Very cool. I’ve done this type of conversion with a few PSUs, including the soft power circuit and a fan replacement. It’s a lot of work, especially if you want the PSU and connectors to look stock on the outside. Yours looks very clean, well done!

Pretty sure the P33 is universal. Look on the other side. It should say universal in the corner. I believe these are just different revisions of the same board.

LOL, actually I would have preferred if you were right and told me how to make the PCI Radeons amazingly fast. I did read some reports that they are faster in OS X, but I never tried it myself. I would surmise that ATI probably put most of their effort into 3d drivers since that was the...

Hmm my experience is different. I benchmarked these quite extensively some years ago on a G3 desktop (that’s in pieces right now). My results were that even the Twin Turbo was several times faster than the 7000 in QuickDraw acceleration. I did confirm that the 7000 had the right drivers and...

TBH, in classic OS those cards are just as good if not better, imho. In my testing many of the older PCI cards had significantly better 2d acceleration than the PCI Radeons. So unless you’re playing 3d games, you’re better off with a IXMicro TT, Rage 128, etc. Of course it depends on the...

Nice! Bought it.

So I finally got around to working on this. The problem went away after installing the MaxPowr extension and control panel. I didn’t have to have to change anything, I think the NewerTech default settings made the difference. Thanks again for the tip!

Awesome, thanks! Now I have another fun project.

Not entirely. I attached the “most circulated” diagram for PM8500. The thread itself no longer exists. The 47k pull-down resistor in the diagram) introduces too high of a voltage drop, resulting in low input signal and therefore the PSU is always on. Lower values like 10k resulted in...

Really nice job! I especially like your ATX psu conversion. I’m tempted to do one myself (even though there’s nothing wrong with my Mac II psu). Did you follow some diagram for the soft power circuit? These things are hard to find and the last conversion I did (PM8500), the resistor values...

Yeah that 233mhz Umax card is probably as good a deal as you’re gonna get in terms of price/performance. The third party g3/g4 cards are usually 5-10 times more expensive.