A poorly Zeddy
A poorly Zeddy
Question what do you with with a zeddy that looks like this ?
some may say scrap it.... but me...
i see it as more of a re birth.... for a little project i have in mind
Andy
some may say scrap it.... but me...
i see it as more of a re birth.... for a little project i have in mind
Andy
what's that Smell.... smells like fresh flux and solder fumes...
Re: A poorly Zeddy
Keep those pictures coming!
Re: A poorly Zeddy
a little more progress on the re-build
ula, cpu and rom socket in place... and a few other bits that are too big...
I'm tying to squeeze most of the passives on the back side using SMD ( if i have the correct values )
regards Andy
ula, cpu and rom socket in place... and a few other bits that are too big...
I'm tying to squeeze most of the passives on the back side using SMD ( if i have the correct values )
regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
Re: A poorly Zeddy
DO IT! Only the best people have smd passives on the back side
With the right size you can place them between the pins. I think these are 0805s.
But why would you want to remove obstructions from the top side? Careful. You know where this kind of tomfoolery ends up...
WHAT ARE YOU DOING MAN! STOP IT! THINK OF THE CHILDREN!
With the right size you can place them between the pins. I think these are 0805s.
But why would you want to remove obstructions from the top side? Careful. You know where this kind of tomfoolery ends up...
WHAT ARE YOU DOING MAN! STOP IT! THINK OF THE CHILDREN!
Re: A poorly Zeddy
more work on the board today, most of the top side done.
The Bottom side, mix of through hole and smd.
bit of a hodge podge of diodes
bodge on a nearly empty RF can, you might notice no ear / mic circuit yet !
or memory
and after a little debugging and poking around with a scope i found 2 shorts,
one that i should have definitely spotted had i have looked properly, the other
a tiny solder splash across 2 adjacent tracks.
i just need to add some ram... now then how do you fit an SMD ram chip into
an 81... oh yeah i remember now....
Regards Andy
The Bottom side, mix of through hole and smd.
bit of a hodge podge of diodes
bodge on a nearly empty RF can, you might notice no ear / mic circuit yet !
or memory
and after a little debugging and poking around with a scope i found 2 shorts,
one that i should have definitely spotted had i have looked properly, the other
a tiny solder splash across 2 adjacent tracks.
i just need to add some ram... now then how do you fit an SMD ram chip into
an 81... oh yeah i remember now....
Regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
Re: A poorly Zeddy
YES! That's what I'm talkin' about
- 1024MAK
- Posts: 5120
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: A poorly Zeddy
Calm down lad, you're blow the top off your chip!
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: A poorly Zeddy
You could solder the SMD RAM directly to the underside of the zeddy
In theory, there is no difference between theory and practice. But, in practice, there is.
-
- Posts: 325
- Joined: Sat Sep 27, 2014 8:02 pm
- Location: Stockholm, Sweden
Re: A poorly Zeddy
I take my hat off to you Andy and your vision for that poorly zeddy brought back to life is memorising.
Is that a re-designed ula on that atmega chip I see.
Well done Andy well done
Is that a re-designed ula on that atmega chip I see.
Well done Andy well done