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Post by mrbombermillzy on May 25, 2016 17:20:22 GMT
Well, from what he told me, it seems the DCR power supplies are quite reliable and dont really go wrong.
My one has actually snapped the board in two and broke some traces and blown something in the process. Ive soldered wires to bridge the connections again but its still not working. Not being any sort of analogue electrical guru, thats as far as I went.
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Post by mrbombermillzy on May 24, 2016 17:21:25 GMT
Robert. I got in touch with Ray and I showed him the US 110v PSU's that you posted a while ago. He has actually ordered some of them and did kindly offer to rebuild one for a 220v system for me if I get really stuck finding one. I'm going to keep looking for a while to see if any pop up in the meantime.
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Post by mrbombermillzy on May 23, 2016 21:04:54 GMT
Well good luck to you if you decide to go for it. Unfortunately I dont have any 8563 VDC C128s so I wont be able to help with any testing.
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Post by mrbombermillzy on May 23, 2016 20:04:03 GMT
OK, if you are happy with designing a new circuit around the 8563 then go for it. I don't know that there's as many around as the 6545, that's all. For example, 6545 chips are available here: www.unicornelectronics.com/IC/6500.htmlNow, where are 8563 chips going to come from?! :-)
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Post by mrbombermillzy on May 23, 2016 19:51:08 GMT
When I saw the title I got excited and thought someone was ready to commercially sell a C128 game that they had created! Lol
Anyhow... back on topic...
Perhaps another way to sell would be as a job lot for a figure that you would be happy with on eBay or amibay. Another option would be a swap/trade for whatever it is you were going to spend the money on anyway (that's presuming you wanted other similar Retro computer stuff). Then, again, amibay would be suitable in this instance.
And, of course, you can always try the for sale boards here too! This place is really starting to liven up now with a bit more traffic lately and new projects all around.
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Post by mrbombermillzy on May 23, 2016 19:23:59 GMT
On the same page is both the analogue and digital rgb versions. There are also circuit diagrams. Plus 6545 is less buggy than 8563. Its up to you, but I would look into this before possibly re-inventing the wheel again.
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Post by mrbombermillzy on May 23, 2016 17:30:09 GMT
Miro, If you are going in this direction, and seeing as you mentioned the 6545 VDC, then why don't you use the setup described here: www.6502.org/users/sjgray/projects/colourpet/This circuit can output 256 colours in rgb analogue or 16 background AND 16 foreground colours in rgbi format. Most of the work is done for you here. And on top of that, there are probably more 6545 or compatible derivatives of than the 8563.
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Post by mrbombermillzy on May 17, 2016 5:24:41 GMT
I will do. Thank you.
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Post by mrbombermillzy on May 16, 2016 20:01:23 GMT
Just to let everyone know, (Miro too!) Ive been spending any spare time that I have brainstorming over the VDC and its inherent faults.
There's not much point in me continuing with higher resolutions or trying better colour modes if the screen is going to suffer with the character corruption which starts with only 83 horizontal character width. So somehow this has to be addressed.
Now, the guys who made the VICII had to fix dotclk timing errors and several other faults AFTER it was released, but at least it pretty much worked first time.
Considering that the VDC 8563/8 chips were rushed out (NON WORKING TILL R6-9!!) and basically bodged to work and then (and this especially applies to the 8568) no one at Commodore by then knowing the exact details of how it properly worked, does not really inspire confidence in pushing the chip to its theoretical limits and getting back good results!
I'm actually impressed that we have managed to get as far as we have with the higher resolutions with minimal corruption. However, I think I will have to carry on with my general plan of finding out for myself exactly what can and can't be done with the VDC, specifically looking at the corruption issue from a hardware level.
So at some point, I will set up a 'test bed' environment for the 8568 and do my best to solve the character corruption problem...and if the problem is what I think it is, then I may have a nice surprise for you other than properly displayed characters!
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Post by mrbombermillzy on May 16, 2016 19:25:53 GMT
Many thanks. I will email him to see what he thinks.
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