Search found 18 matches

by kscharf
Thu Mar 22, 2012 10:37 pm
Forum: Hardware
Topic: 1284P addon
Replies: 24
Views: 6810

Re: 1284P addon

I'd like to see the schematic for the adapter too. BTW the atmega1284P isn't 100% compatible with the '644P, it's a superset in that it has a SECOND 16 bit timer counter unit. This is burried in the data sheets since Atmel has TWO different data sheets for the device. One covers ONLY the atmega1284P...
by kscharf
Fri May 20, 2011 10:50 pm
Forum: New to Uzebox? Start here!
Topic: Uzebox Kits Now Available!
Replies: 29
Views: 25849

Re: Uzebox PCB Base Kits Now Available!

I've ordered a new batch of 10 and they should arrive within 1-2 week. Btw I still have a couple PCBs available that were not electrically tested. But I've made them with 10mils for traces and spacing so they are most certainly just fine. Let me know if your interested. So the layout of these board...
by kscharf
Fri May 20, 2011 2:12 pm
Forum: New to Uzebox? Start here!
Topic: Uzebox Kits Now Available!
Replies: 29
Views: 25849

Re: Uzebox PCB Base Kits Now Available!

What's the status today? Can I order a PCB? Did you add provision for an overpowered '1284?
by kscharf
Wed Mar 30, 2011 7:50 pm
Forum: Hardware
Topic: Yet another future of uzebox+comparison of chips
Replies: 42
Views: 14031

Re: Yet another future of uzebox+comparison of chips

Samples are great...when you receive some. :( And then, it not of much use for kit makers. Only meant as an answer for anyone building from scratch. Since I'd need the base 3.59Mhz for the chrominance modulation why now use that as the crystal? I understand the PLL could multiply that to 28.6, 32.2...
by kscharf
Tue Mar 29, 2011 6:03 pm
Forum: Hardware
Topic: Yet another future of uzebox+comparison of chips
Replies: 42
Views: 14031

Re: Yet another future of uzebox+comparison of chips

I'll definitely make a JAMMA version of the Uzebox using the XMEGA :lol: One complaint I heard over and over regarding the original Uzebox design was it's use of the "awfully expensive" AD725. The XMEGA has many peripherals and I think I can directly generate Y/C (Luminance/Chrominance) video witho...
by kscharf
Mon Mar 28, 2011 8:13 pm
Forum: Hardware
Topic: Yet another future of uzebox+comparison of chips
Replies: 42
Views: 14031

Re: Yet another future of uzebox+comparison of chips

I first used this chip almost a year ago. We had some problems with GCC where an application that worked on the xmega128a3 did NOT work on the xmega256a3 even though the only important differences between the two is just the upper memory limits. Something to do with the way GCC fakes pointers larger...
by kscharf
Wed Mar 23, 2011 9:31 pm
Forum: Hardware
Topic: Yet another future of uzebox+comparison of chips
Replies: 42
Views: 14031

Re: Yet another future of uzebox+comparison of chips

The atxmega256a3 is available now. schmartboards can be used as breakout boards and you can solder a .5mm TFQP to them with a fine tip soldering iron. Might need a level translator to feed the D/A resistors or change values as the xmega is a 3.3 volt part. The xmega will require code changes to hand...
by kscharf
Sun Mar 06, 2011 8:44 pm
Forum: Hardware
Topic: Handheld Uzebox!
Replies: 4
Views: 1553

Re: Handheld Uzebox!

That's just a repackaged uzebox with a miniature NTSC LCD monitor. Might even be the guts from an old LCD TV. You know, now that analog TV is dead I bet you can find some of those 2-4" LCD TV sets real cheap on fleabay. Rip the guts out of one and repackage it with an Uzebox PC board. If you use all...
by kscharf
Sun Mar 06, 2011 8:38 pm
Forum: Hardware
Topic: which at644?
Replies: 1
Views: 1082

which at644?

There are several atmega644 variants, IE: 644, 644A 644P (644AP ?). The original only has ONE usart, the rest have two. For the uzebox are all variants software/hardware compatible (I know that they are pin for pin compatible)? Adafruit is out of the kits and pcb, she claims they are re-designing th...
by kscharf
Mon Aug 16, 2010 1:51 pm
Forum: Hardware
Topic: Atmega1284P Test Results -- UPDATED!
Replies: 32
Views: 15530

Re: Atmega1284P Test Results!

Heat is an enemy of overclocking. Cryogenicly cooled IC's have been overclocked by huge amounts. You may think the chip is running cool, but inside it may be "sweating". Get a can of "Freon" cooler (they don't use real Freon anymore) used to test electronics for faulty parts and spray the cpu till i...