PAK issues

[PhilC]

Great benchmark Frank. I'll be upgrading mine to 50mhz when I get the time. Then I'm looking at something like a Mega ST to ET4000 adaptor if I can find one, if not I'll try and make one.

[bbisi]

Hello People
Is here anybody who can help me
Im not so good in English. Sorry
I make a Pak68/3 and now the test with error screen black.
I make all tests you write in this article.
No booting
All Ics are correct in socket

These Things are on board
Board Ver Pak68/3 030 3A
FPU MC68882RC50A , Cpu MC68030RC50, Quarz 32MHZ, Tag Ram MK48S74N-20, U3=74F86, 5 Gals 20V8B 15LP, 1 Gal U3 16V8 10LP, 4 Eeproms 27C010 120ns AMD,


Is anyone here who has an super idea
Fotos I send in a few minutes

Greeting
Bernd

[bbisi]

Here som pics

IMG_1869 2.JPG (728.9 KiB) Viewed 77 times

IMG_1868 2.JPG (706.81 KiB) Viewed 77 times

IMG_1867 2.JPG (770.57 KiB) Viewed 77 times

IMG_1865.JPG (792.35 KiB) Viewed 77 times

The bridges are from the test. But the screen is black
+5 and GND are ok
When I put the 68000 on the mainboard all is running

only with pak68 the screen is black

hmm
i dont know

[rubber_jonnie]

.. as my PAK still doesn't work and I know everything else on it does.

Was this pak020 or 030? I have a pak020 and tried multiple setups and never got it working. Though I sent it to RJ and he says it works fine on his machines. I even have the same motherboard as him, also tried various PSUs and voltages and just doesn't work on my boards.

Oddly I did have it working once as I benchmarked it.. It pretty much went in my draw, came out months later, likely out in same motherboard and never worked since. Best I get I think I got was a row of bombs on the screen.

And I have a PAK 20 too that works just fine on mine. I think yours was an earlier revision @exxos as it had bodge wires that mine doesn't.

[Darklord]

@bbisi

Okay, maybe I'm missing something but is that board fully populated?

Mine looks like this:

P7070009_FINAL.JPG (255.39 KiB) Viewed 72 times

[exxos]

And I have a PAK 20 too that works just fine on mine. I think yours was an earlier revision @exxos as it had bodge wires that mine doesn't.

Yeah I believe so. I gave up trying to get it to work in the end. Worked on your boards but none of mine.

[bbisi]

hi Darklord
the board on the picture is the samePak68/3-030. rev3A
I bought it from cosmos
No the pictures shows them searching the error ( black screen) like this
I give a complete foto

I used this method :
Post by pakman » 05 Feb 2019 17:39
The 64pin sockets (up and down) are in the right place.
Let's try with the 68000 on top again, removing the GALs step by step. With U3 still removed, connect with short wires:
U3 pin9 to U3 pin19
U3 pin11 to U3 pin14
U3 pin12 to U3 pin15
Jumpers J5 and J6 both open
Assemble the 68000 on top, and try to boot..

and this
Next: Remove all GALs and all ROMs.
The only ICs on the board are now: 68030, FPU, 74F74 and the 68000 on top.
SRAMs may stay in place if soldered.
Connect on the empty socket U5 pin8 with pin12.
Connect on the empty socket U1 pin17 with pin24.
Try to boot..

That is what I do to find the error. I read them all I don't find the error
I think the error comes from the eprom or gal ????

IMG_1873.JPG (656.93 KiB) Viewed 53 times

IMG_1870.JPG (605.16 KiB) Viewed 53 times

IMG_1872.JPG (740.13 KiB) Viewed 53 times

[frank.lukas]

The PCB is not an original one and not a copy from poland with a single trace missing in the layout. Are the boards functional and tested?