Jupiter ACE Kit /sorry half off-topic! :)/
- Plamen Vaysilov
- Posts: 5
- Joined: Fri Dec 06, 2013 8:52 am
- Contact:
Jupiter ACE Kit /sorry half off-topic! :)/
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 ....
So coming soon with pictures and information ....
- Attachments
-
- Bottom.jpg
- (161.37 KiB) Downloaded 1465 times
-
- Top.jpg
- (192.08 KiB) Downloaded 1465 times
"I really do like SOLDERING as my programming language." Bob Pease
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Nice, one of those would look great beside (my currently unbuilt) zx80core
G
G
- Plamen Vaysilov
- Posts: 5
- Joined: Fri Dec 06, 2013 8:52 am
- Contact:
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Ready for test , kit coming soon.
- Attachments
-
- Top.jpg (124.91 KiB) Viewed 71675 times
"I really do like SOLDERING as my programming language." Bob Pease
- Plamen Vaysilov
- Posts: 5
- Joined: Fri Dec 06, 2013 8:52 am
- Contact:
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Is Working... !!!
- Attachments
-
- JAVorkingS.jpg (68.5 KiB) Viewed 71624 times
"I really do like SOLDERING as my programming language." Bob Pease
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Nice, my first ever view of one working! Congrats!
- 1024MAK
- Posts: 5189
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Great work
. . .
Mark
. . .
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor 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 being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor 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 being good this year.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
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.
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.
Last edited by Prime on Wed May 07, 2014 11:24 am, edited 1 time in total.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
Ill be interested as I have the same result with mine.
Re: Jupiter ACE Kit /sorry half off-topic! :)/
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.
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.