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| Minimig rev 1.0 PCB | ||
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Description: This is a screenshot of my Minimig rev1.0 PCB. I only have to check the PS/2 connections and then it's ready to go to the PCB manufacturer. In this screenshot, red=TOP, green=BOTTOM, white=SILKSCREEN. The ground plane at the bottom is not drawn, hence the blue lines indicating ground connections. Picture Stats: Views: 14651 Filesize: 111.43kB Height: 768 Width: 1024 Posted by: Dennis at June 11, 2006, 03:39:53 PM Image Linking Codes
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| AJCopland Posts:909 | May 08, 2007, 10:39:57 PM @weirdami "thingy" "doodad" and "whatchamacalits" ... i'm impressed! :-D Andy |
| Methanoid Posts:147 
| January 26, 2007, 11:22:37 AM Damn, just convinced myself I NEED a Minimig but I also NEED Composite or RGB out.. It needs to connect to my TV somehow without tying up the DVI port! |
| odin Posts:6796 | January 23, 2007, 07:51:02 PM Which schematics prog are you using? |
| Dennis Posts:128
| July 26, 2006, 08:41:10 PM @weirdami Quote Neat stuff. Will I be able to hit the copper on this baby? Sure! Minimig has a cycle acccurate copper (I hope...) Quote You said something about something taking too many pins on the FPGA so it was not implemented. You mean the parallel port? The only way to solve it would be with a bigger FPGA or with an expansion header that hooks up to the 68000 bus. Dennis |
| weirdami Posts:3776 | July 19, 2006, 11:57:55 AM Neat stuff. Will I be able to hit the copper on this baby? :-) You said something about something taking too many pins on the FPGA so it was not implemented. Is that a problem that could be fixed with a second FPGA? Or, like, some kind of special connector thingy for a third party to make a doodad to implement other I/O dealies or whatchamacalits that FPGA pin limitations prevent from being in implemented? |
| bartsimp Posts:1
| June 21, 2006, 03:18:47 PM Just great i must say, is there any way of getting my hands on this masterpiece?? |
| ivier Posts:14
| June 17, 2006, 05:26:48 PM You could implement composite in the FPGA without an external encoder chip. I found the verilog source for a simple RGB to NTSC encoder on a japanese geeks site. I can't read much of the site, but the verilog sources are quite informative. here is the site i found it on. Beta2_Verilog is the most recent version. This is part of the FPGA PACMAN project. (which is not nearly as cool as an FPGA Amiga) Ofcourse for PAL users it'll need a little modification to get the color burst right. Or there is likely a PAL encoder on the net somewhere to use instead. |
| Argus Posts:942
| June 17, 2006, 11:51:00 AM WOW, that is absolutely fantastic! Where and when can we buy!!!! |
| Chain Posts:1324 | June 14, 2006, 06:25:17 PM :-o HOLY GRAIL! :-o I will build this baby for sure if it will be possible :crazy: THANKS DENNIS! :bow: |
| TheSLASH! Posts:24
| June 13, 2006, 10:56:29 PM I have been waiting for a Joystick-Amiga, like all these with C64 or Arcade games... This is a good try.. |
| nex4060 Posts:238
| June 12, 2006, 09:55:16 PM Just one simple word.. WOW!!!!!!! |
| Dennis Posts:128
| June 12, 2006, 07:13:05 PM Quote No composite out? No, AlexH is right, for that you would need an extra encoder chip, something like this. Quote What the heck is this?? Where is the professional DPAINT picture of the motherboard. Why on earth are you using some electrical design program when you could be using the power of Dpaint?? well, I could always announce some announcements, cancel a demonstration or two and take some preorders! (sorry, couldn't resist :-D ) Quote I see the Parallel port isn't present, is it actually working and just not making it to the outside world, or is it not there?? Parallel should be working, but needs a lot of pins on the FPGA. I though it wasnt really needed so I did not implement it. I really tried to keep things as simple as possible. Dennis |
| Tigger Posts:1890
| June 12, 2006, 04:34:05 PM What the heck is this?? Where is the professional DPAINT picture of the motherboard. Why on earth are you using some electrical design program when you could be using the power of Dpaint?? On a more serious not, nice work Dennis. I see the Parallel port isn't present, is it actually working and just not making it to the outside world, or is it not there?? Just was thinking, lots of my A500+ based systems are wearing out, and it possible we could use this to replace the A500+ with an adapter card or something, the 31Khz would help out as well. -Tig |
| alexh Posts:3644 | June 12, 2006, 03:58:52 PM I was having a think and if you wired RGB+ sync together you might get something vaguely like Luma+Sync which might work as composite video in black and white (mono). |
| Oli_hd Posts:912
| June 12, 2006, 03:41:44 PM Just do an A1000 and make it mono  |
| alexh Posts:3644 | June 12, 2006, 02:47:20 PM Quote actually RF out needs a modulator, composite doesnt D'oh typed too fast without thinking. I of course meant video encoder chip rather than video modulator chip. Quote you need to combine the colour with the video signal You cannot just "wire" MiniMig's RGB+Sync to one wire and expect it to work as composite video. Composite video works in the YUV colour space and so you have to colourspace convert the RGB to analog YUV. Then you have to time when you present your luma and chroma bursts with respect to the different syncs. http://en.wikipedia.org/wiki/Composite_video To provide composite, IMHO you would have required a video encoder. Creating a video encoder inside the FPGA would be too much work and too much off topic. Having an extra chip would have increased the BOM too much. |
| Oli_hd Posts:912
| June 12, 2006, 01:19:36 PM actually RF out needs a modulator, composite doesnt, although it would need a different pin as unlike SVGA/Scart you need to combine the colour with the video signal. A simple cable could be made to connect the minimig to a composite TV though |
| alexh Posts:3644 | June 12, 2006, 12:25:24 PM Composite out would require a [edit] video encoder chip. This is a low cost system. If there are enough pins maybe you can wire up an A520 in 15Kz mode. |
| keropi Posts:2466 | June 12, 2006, 11:15:21 AM impressive!!!! |
| Matt_H Posts:6412 | June 11, 2006, 11:29:00 PM I like the 15/31KHz jumper - that's a great feature. And if you ever do advance the re-implementation from OCS to AGA, can the same board be used with a simple upgrade of the FPGA program? EDIT: No composite out? |
| Zac67 Posts:2890 | June 11, 2006, 07:46:03 PM :-o awesome! |
| CD32Freak Posts:646 | June 11, 2006, 06:57:28 PM Good job, Dennis, very impressive! :-) |