exxos build

[PaulJ]

@PaulJ Just mean. Like the girls at school. Mean Girls.

Come on Jon, you know were all pulling for ya!!! Shesh Exxos created your own celebration icon. :girldance:

[exxos]

Come on Jon, you know were all pulling for ya!!! Shesh Exxos created your own celebration icon.

Yeah, it was actually my second choice, I probably would have got in trouble with the one I was going to add originally :lol: :roll:

[Icky]

Having 3 built @exxos doesn't mean you get 3 H4 mugs :)

[exxos]

Having 3 built @exxos doesn't mean you get 3 H4 mugs :)

@rubber_jonnie is right everyone is being a meanie today :)

[Icky]

Having 3 built @exxos doesn't mean you get 3 H4 mugs :)

@rubber_jonnie is right everyone is being a meanie today :)

Well @rubber_jonnie doesn't even have 1x mug - yet! I'm holding it in storage for the right moment :)

[rubber_jonnie]

Having 3 built @exxos doesn't mean you get 3 H4 mugs :)

@rubber_jonnie is right everyone is being a meanie today :)

Do I get (H) 4 mugs for creative troubleshooting?

I don't know why eryone is so mean today!! ;)

[exxos]

In amongst all the chaos of testing chips on various H4's... #3 seemingly died for no reason which I just investigated.

All the clocks were present but I never saw /AS going low ( or if it did, I did not detect it on my scope). Probing around I saw RESET was switching, but HALT was stuck low all the time. I removed the CPU and HALT started to function correctly again. I noticed a bent pin on the CPU, always one of the corner ones, honestly I seriously hate PLCC packages! But nope, still no boot.

I took the ROM out to make sure it did actually have TOS104 in it.. and after fighting with a iffy PLCC adapter for my programmer, I found them verified TOS was in the lower bank. I also found the ROM also had a bent pin on the corner, and I mention I hate PLCC packages ? But nope, still no boot.

I swapped out the CPU,MMU,GLUE with known working ones but still no joy...But then I noticed something....

IMG_5049.JPG

Let's see who can see what is wrong, I was frankly amazed by this in more ways than one... I guess us season builders will spot it right off...

Needless to say this board is now booting again now :D

[derkom]

You haven't shorted the necessary pins in the DS1315 socket.

[exxos]

You haven't shorted the necessary pins in the DS1315 socket.

That's a point, but that only effects the cartridge port, and in this case there isn't one :lol:

[derkom]

You haven't shorted the necessary pins in the DS1315 socket.

That's a point, but that only effects the cartridge port, and in this case there isn't one :lol:

I will admit I never actually knew what the DS1315 was for. :)

I'll take another stab at it: You've got your TOS ROM 180° wrong. :mrgreen:

Tell us how you feel about PLCC packaging.