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Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 4:35 pm
by rubber_jonnie
PaulJ wrote:
Sat Jan 18, 2020 4:25 pm
rubber_jonnie wrote:
Sat Jan 18, 2020 3:59 pm
Ok, physical build is done, bar patches in the other post. They are coming happening now :)
IMG_20200118_154640.jpg
@rubber_jonnie , looks good. There's a 33 ohm resister that goes under the from of the dam chip. I couldn't see it but I assume it's there. I had to file away a little bit of the socket and used a 1/8 watt resister. Check if you installed it. :)
Yep, caught that one, I installed it on the underside of the board. I did consider removing the socket and doing it nicely, but I had too much other stuff to do.

Just got to do the BGACK 2.2k pull up now, on the home straight :) EDIT that's done too. Chips in sockets next.

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 6:43 pm
by PaulJ
@rubber_jonnie , figured you missed it or put it on the bottom of the board. Let us know how you make out when you shoot the juice to it. :dualthumbup:

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 8:09 pm
by rubber_jonnie
Board is fully populated, but wondering what jumpers need to be set if any?

Blitter one is jumpered as no Blitter fitted.

Is there a master list at all?

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 8:17 pm
by PhilC
It's in this thread @rubber_jonnie

viewtopic.php?f=73&t=2229

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 8:41 pm
by rubber_jonnie
@PhilC thanks

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 8:48 pm
by PhilC
Looking forward to seeing you've got it up and running @rubber_jonnie

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 11:25 pm
by rubber_jonnie
PhilC wrote:
Sat Jan 18, 2020 8:48 pm
Looking forward to seeing you've got it up and running @rubber_jonnie
Me too. Hopefully will find out tomorrow!!

Would have done it tonight, but we had plans!

I've waited this long, I can wait a bit longer.

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sat Jan 18, 2020 11:43 pm
by PaulJ
PhilC wrote:
Sat Jan 18, 2020 8:48 pm
Looking forward to seeing you've got it up and running @rubber_jonnie
@PhilC , you making any progress with your memory issue?

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sun Jan 19, 2020 7:40 am
by PhilC
@PaulJ , nope, no time yesterday in the end. Hoping to have a but more time today but just started another major project at work again too.

Re: RJ's Attempt. Maybe he's going to finish this time!

Posted: Sun Jan 19, 2020 9:20 am
by rubber_jonnie
Ok I powered on and get a stable white screen, so troubleshooting is the next thing to do. I suppose in a way it's good,as I'm generating a display of some sort, and it's nice and bright.

But I had a bit of an "Oh crap" moment too. Pin 38 (GND) on the cartridge port goes up to R13.Somehow the tails for R13 and R919 got pushed together and shorted, and when I plugged in my diag cart, it burned out the track down near the cartridge port. :sigh:

Normally I put resistors back to back so this can never happen, but for whatever reason, I didn't. :sigh: :sigh: :sigh:

It's not the end of the world, as it's one track and I can put a bodge wire underneath to repair, but I'm kicking myself.

Resistor will get moved later so this can never happen again. EDIT now repositioned and bodge wire installed to reconnect pin 38 of the cartridge port

On a positive note, the diag cart is fine. Always trying to find a positive......

I'm off to the shooting range later, it's a good place to chill out and think about my strategy for troubleshooting (Starting here: viewtopic.php?f=78&t=2362)

I have a new scope arriving this week, using my Hantek USB device and laptop is quite impractical because of my small work area, so the new one will make my life a bit easier. The Hantek was good as a starter scope, but I need better now, especially as I'm also working on the Mega 4.