Macintosh IIfx logicboard recreation

[warmech]

I've been waiting for a long time for this to come to fruition and, I have to say, you have absolutely gone above and beyond once again, sir. I just about lost my mind when I saw the repo updated the other day in GitHub, lol. My IIfx can finally live again and that makes me so very happy.

Kudos, sir - this is absolutely amazing work!

 

[Unknown_K]

I assume the next step is a Tokamac.

 

[Jockelill]

Incredible! Just incredible!!

 

[olePigeon]

@Bolle Just out of curiosity: when working on the board, did anything obvious stand out as to why C1 tends to blow on the original IIfx board?

 

[Bolle]

And finally took some time to do some boring work and cleaned up the schematics.
Those will probably help anyone troubleshooting a real or reloaded board.

 

[Arisotura]

I was looking around and saw this, just wanted to say, super interesting!

 

[trag]

Amazing work!

 

[mst3k]

Mind boggling. Consider this mind boggled!

 

[pezter22]

Wowza! I have two battery bombed boards and would love to try transferring my good parts onto a recreation board. I was never able to get past the Death Chime on them. I'm guessing internal layers were damaged near RAM bank A from a combination of battery and capacitor vomit.

Incredible work.

 

[MOS8_030]

Incredible accomplishment indeed!

 

[68kPlus]

This is amazing! Love this seeing this sort of work. Even my Mum was impressed and she doesn't even know how any of it works.

 

[LaPorta]

No photo of her powered up?

 

[Joopmac]

Wow i am so very impressed

Next stop: M5126 boards ?

 

[nottomhanks]

Brilliant work as always!! I had a IIFX back in the day, but gave it to someone and they three it out.

 

[pezter22]

I ordered the boards today from JLCPCB. I have two battery bombed boards I will be using as parts boards. Should be a fun project.

 

[Callan]

I'm not sure if they're requiring you to get 5 or not, but If so I'd be interested in one if your selling the extras. If not, if anyone has a spare iifx reloaded pcb they want to sell lmk.

 

[nyef]

I may also be interested in a board or two as well, given what happened last time I tried to use my "working" IIfx (spoilers: it wasn't anymore).

 

[TimHD]

Great work!

 

[pezter22]

I built my first recreation board and am having trouble booting at the moment. I didn't expect to get a first successful boot on my first try.

I am getting no boot chime and no video. I am also not able to boot from the power button, but I can jump it. It does shutdown with the power button, so I know the power on issue is with the NAND gates and I can figure that out later.

I have found some pins not soldered to the pads on some of the PLCC chips. And on a IC's with the tiny pins I found some that were not connected. All those were fixed.

It's just the no boot chime, no video that has me stumped. What am I missing? Any suggestions? FLIR camera shows activity.

 

[Bolle]

Regarding the soft power problem: you have to place a jumper on either the ATX or the Mac setting next to the HC132s. (to match whatever power supply option you're using)
That's not going to solve your no chime issue though.
I'd start checking the usual... is everything coming out of reset? Does the CPU get a clock signal? (it looks suspiciously cold in that flir image)
Is the CPU walking the bus without a ROM installed?
Check all solder joints again at least 10 times

Once you've got the board to chime a jumper should be installed at J103 to enable the external cache. J106 (forces the CPU to always operate at half clock speed) and J20 (disables internal CPU caches) should stay open.