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Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Wed Jan 15, 2014 4:44 pm
by Plamen Vaysilov
I received PCB boards for Jupiter ACE kit project ,today will test if everything is as it should.
So coming soon with pictures and information ....
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Sat Jan 18, 2014 10:47 pm
by XorA
Nice, one of those would look great beside (my currently unbuilt) zx80core
G
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Tue Jan 21, 2014 7:30 pm
by Plamen Vaysilov
Ready for test , kit coming soon.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Thu Feb 06, 2014 9:11 pm
by Plamen Vaysilov
Is Working... !!!
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Fri Feb 07, 2014 6:09 pm
by XorA
Nice, my first ever view of one working! Congrats!
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Sun Feb 09, 2014 10:10 am
by sirmorris
Well done
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Sun Feb 09, 2014 3:21 pm
by 1024MAK
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Tue May 06, 2014 4:47 pm
by Prime
Humm just bought one of them off Ebay,
Not managed to get it going (yet), there seems to be a problem with the clock oscillator, I have the 6.5MHz out of Q1 once I realized that the silk screen for the transistor was the wrong way round ! But it only produces a vmax of 1.6V, the signal out of pin 8 of IC23 (LS86) is only 3.6V As is the divided 3.25MHz fed through R7/C4 to Q2. Putting the scope on the base of Q2 I get absolutely nothing, which is why no Z80 clock.
Having checked with my Real Ace board, the signal levels out of the oscillator and out of the LS86 seem correct, so it seems the problem lies around Q2 somewhere.
I do get a display of random bitmaps (as the character RAMS are uninitialized at this point) though it is not syncing properly.
I do wonder why some of the R and C values have been changed from the original circuit ? Also Q2 is a 2N2369 in the original but another 2N3904 in the kit.
I do have an original JA board which is currently not working so I'll cross check with that and hopefully end up with both working
Cheers.
Phill.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Wed May 07, 2014 8:05 am
by acsi
Ill be interested as I have the same result with mine.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Posted: Wed May 07, 2014 3:36 pm
by Prime
Ok, doing some reading on common emitter transistor switches I think the problem is that the signal being applied to the base is too great to ever allow Q2 to switch off.
I think the solution to this is to alter the value of R7, I'll do some experements this evening and post my results here.
Cheers.
Phill.
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