my attempt to make a xenogc modchip

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shadowtuy
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my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 3:51 am

I am very new with PCB manufacturing but, I wanted to learn and creating a mod chip seems to be a good place to start....
remember i am very new to this so and incite would be appreciated. I fallowed the guide from http://www.gc-forever.com/wiki/index.ph ... _the_Board
XENOGC COMPLETE.png [attachment=0]XENOGC MINI.png
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XENOGC MINI.png
The mini version of the xenogc
(30.11 KiB) Not downloaded yet
XENOGC COMPLETE.png
the full sized xenogc prototype
(26.89 KiB) Not downloaded yet
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megalomaniac
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Re: my attempt to make a xenogc modchip

Post by megalomaniac » Thu Sep 05, 2013 4:24 am

looks good...
there are a couple of places i would like you to reconsider to make this better but first, can you repost additional photos of the board without the "xeno" "rev" "gc-forever" "blah blah" flashy naming...it makes it easier to see possible errors without all this unnecessary fluff
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shadowtuy
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 4:35 am

ok my apologies here the fixed pics...
Attachments
xeno gc complete.png
the full size without writing
(12.77 KiB) Not downloaded yet
demo xeno mini.png
the mini without writing
(20.86 KiB) Not downloaded yet
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Re: my attempt to make a xenogc modchip

Post by megalomaniac » Thu Sep 05, 2013 5:17 am

all ive really done if show how to improve a bit by making the traces straight and easy to see for first attempt...you this will also make things easier until you are better at etching since angle lines have less width which means less trace...
sometimes it works sometimes it doesnt...
just takes pracetice...

also i did not verify circuit integrity, but something seems a bit off on the mini but im not sure exactly what since i did not verify circuit pinout...just does not seem right..
maybe do the base xeno circuit first without ISP...then after you 100% verify add the ISP??
Attachments
xeno gc complete.png
(11.71 KiB) Not downloaded yet
demo xeno mini.png
(8.71 KiB) Not downloaded yet
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shadowtuy
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 5:37 am

why did you move the pin from the isp to the R1 pin? And i thought i needed the isp to program it with the xeno firmware? and the mini is my assumption of the pin outs using the date sheet for the two of them by matching signals... the mini require parts a tad difficult to obtain so it may not be made. does the the xeno complete look like its going to work?
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shadowtuy
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 5:40 am

28 pin Dip = 32 pin Dip
------------------------
1 = 29
2 = 30
3 = 31
4 = 32
5 = 1
6 = 2
7 = 4
8 = 3
9 = 7
10 = 8
11 = 9
12 = 10
13 = 11
14 = 12
15 = 13
16 = 14
17 = 15
18 = 16
19 = 17
20 = 18
21 = 20
22 = 21
23 = 23
24 = 24
25 = 25
26 = 26
27 = 27
28 = 28
-------------------------
Not conected pins
-------- 5 = GND
-------- 6 = VCC


my data sheet you dont have to verify, i thought i would share....
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Re: my attempt to make a xenogc modchip

Post by megalomaniac » Thu Sep 05, 2013 5:54 am

Like I said I didn't really look over the circuit...I just showed ways to improve the trace layout..
If that R1 matches schematic, then ignore that scratch out ...
The complete version looks mostly correct but I can't confirm without further examination of your routes..
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shadowtuy
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 6:08 am

ok ill scrap the mini thank you :)
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Thu Sep 05, 2013 10:21 pm

hey quick question.... the holes on the pcb that i used to connect traces from the front to the back. how do i go about doing it? Do i fill the hole with solder? or is there something I'm supposed to use?
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Re: my attempt to make a xenogc modchip

Post by megalomaniac » Fri Sep 06, 2013 2:05 am

the holes are called vias
they are electroplated holes which make contact thru both layers of the pcb...
this is something which is typically not performed at home...

there are alsoa bastardized version of vias which are like PCB rivets...i would not suggest using those...
instead just leave a copper ring on both layers of the pcb...drill a hole thru the center of the ring...push wire or a brass post thru the hole and solder to both layers to complete the trace...


example: the MEGAdrive PCB uses vias with the old dvd connector legs soldered to each side of the MEGAdrive and the Mainboard...
thats more of a pcb sandwich but i think you get the idea...
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shadowtuy
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Re: my attempt to make a xenogc modchip

Post by shadowtuy » Fri Sep 06, 2013 2:32 am

thats what i thought but i didnt think it was the correct way to do it.....another question can you solder resits at home. (painting the board green)
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Re: my attempt to make a xenogc modchip

Post by megalomaniac » Fri Sep 06, 2013 3:02 am

it depends on what method you want to use...
lamination, paint and heat, paint and UV light

i build a little UV exposure box and use transparant sheets to expose my photosensative PCBs for etching, and with the UV soldermask i also use a soldermask transparent sheet in the UV box also

here is some more general info: viewtopic.php?f=24&t=891
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Diego borella
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Re: my attempt to make a xenogc modchip

Post by Diego borella » Sun Feb 09, 2020 9:58 pm

megalomaniac wrote:
Thu Sep 05, 2013 4:24 am
looks good...
there are a couple of places i would like you to reconsider to make this better but first, can you repost additional photos of the board without the "xeno" "rev" "gc-forever" "blah blah" flashy naming...it makes it easier to see possible errors without all this unnecessary fluff
Mega, tell me, an atmega88 can be used
in place of an atmega8; 8L; 8A?
I have an atmega88 ...
can i use it ??? would he work?
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seeWood
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Re: my attempt to make a xenogc modchip

Post by seeWood » Mon Feb 10, 2020 8:21 am

Here are the parametics for the AT88
https://www.microchip.com/wwwproducts/en/ATmega88

and he AT8:
https://www.microchip.com/wwwproducts/en/ATmega8

i dont think it works without some adaptations cause its in definition not the same Chip
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Diego borella
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Re: my attempt to make a xenogc modchip

Post by Diego borella » Mon Feb 10, 2020 7:34 pm

thank you friend!
I already had that thought, but I wanted to be sure.
could someone tell me about the devices on which we can find these Atmega8 chips?
because this atmega88 is widely found in nobreaks. this one that I found on a UPS.
and more, from what I understand in this post, the megalomaniac said that we have to delete the data from that chip? is it erasable and rewritable?
please don't tell me to buy a new one, because here in Brazil things are more difficult and recycling is the best option.
where would i find an atmega8L or 8A chip? I mean, what devices are they used on?
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