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Old 29 December 2017, 09:50   #61
Nostromo
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Thanks! So, just before I try and order one:

1. Can I connect any USB keyboard and joypads to play?
2. I plan to hook up the system to a TV. Will there be issues with picture and audio?

Thanks!

Last edited by Nostromo; 29 December 2017 at 10:35.
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Old 29 December 2017, 11:14   #62
Higgy
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Hi. As I understand:

1. It has USB connectors but uses PS/2 protocol. A lot of USB keyboards are still PS/2 compatible so that is not an issue.
Joypads might be more of a problem but there was talk of wiring in a 9 pin dtype plug on the GPIO to connect original joysticks. I am pretty sure the AMIGA Minimig FPGA port would need this adding in, but hopefully Valentin will add this.
2. It is HDMI out with sound so perfect for TV. There was talk of the potential for adding a 3.5 mm jack to the GPIO port if you were using say a HDMI-DVI converter, but it don't think that was so easy.

Hopefully the Minimig filters will also be included as i think with scanlines and a filter it looks quite good on VGA (this was using a MiST on a VGA monitor).
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Old 29 December 2017, 11:18   #63
Nostromo
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Thanks Higgy

1. I hope we can use USB joypads, something like the PS4 controller or something cheap like a Buffalo SNES style joypad would be perfect.

2. Quoting Valentin himself, this worries me a bit:

"Regarding your suggestion Higgy: I'm afraid it isn't as simple as that. You see, Minimig (as ported to FleaFPGA Ohm) is really only capable of what is intended to resemble 576p (or 576i when Amber is bypassed) screenmode via the video out. It does not upscale nor convert to any other mode (very difficult for me, given my very limited knowledge of the Amiga platform). This limits your display options to TV screens only (I don't know of any dedicated PC monitors that support 576p..). Worse still, minimig core video is clocked at 28MHz, not 27MHz as required for 576p, so some modern digital TVs may 'choke' on the signal while others may not.."

It is too tech for me to understand, but it seems that not all TVs will work. I'd love to be corrected
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Old 29 December 2017, 11:36   #64
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I think he was talking about my idea of using DVI monitors. For me i have a number of pc monitors with DVI but they don't have sound so I would need a 3.5 mm jack.

I think Valentin was saying that although DVI and HDMI are digital signals they don't support the same freq/res.

The Flea is setup for HDMI.
Saying that I know the Spectrum Next has had some issues in various HDMI TV's.
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Old 29 December 2017, 11:39   #65
Nostromo
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This bit

Worse still, minimig core video is clocked at 28MHz, not 27MHz as required for 576p, so some modern digital TVs may 'choke' on the signal while others may not..

So basically even if using HDMI there is no guarantee it will work.
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Old 29 December 2017, 16:44   #66
pandy71
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Quote:
Originally Posted by Akira View Post
Thanks for schooling my ignorant ass.
Here I was thinking they were analog!
Paddle part is analog but circuitry is not highly accurate and as such some AD converter can be created adhoc only with plain FPGA (using LVDS input - 8 - 10 bit is feasible).

Quote:
Originally Posted by Nostromo View Post
This bit

Worse still, minimig core video is clocked at 28MHz, not 27MHz as required for 576p, so some modern digital TVs may 'choke' on the signal while others may not..

So basically even if using HDMI there is no guarantee it will work.
Probably not... simply analog signal will be resampled with 27MHz i.e. Amiga pixels will be resampled and no longer 1:1 mapped on display pixels, for digital some Amiga pixels can be omitted (active video in Amiga is max 736 pixels). Quality loss will be obvious and Super Hires no longer super.

Last edited by pandy71; 29 December 2017 at 16:57.
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Old 29 December 2017, 18:56   #67
Nostromo
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I thought video signal via hdmi is digital?
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Old 30 December 2017, 18:39   #68
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Quote:
Originally Posted by Nostromo View Post
I thought video signal via hdmi is digital?
It is digital, my point was related to Minimig and SCART input on TV.
In digital domain things can be done easier and DVI offer some advantage over HDMI as custom video timing can be used (display capabilities is different topic) - HDMI btw also can use custom video timing however predefined and standardized video modes are preferred and mostly only those are supported.
Side to this - seem best idea to fit native Amiga signal over digital interface is using 720p compliant mode - at a cost of padding video with solid color areas (this can be used to display some additional data like floppy status etc) and reduced video size this is only one way to keep V-sync and pixel 1:1 mapping on lowres and hires video mode, to keep super hires higher video mode such as 1920x1080 or better 1920x1200 resolution is required but then we begin to new discussion on vertical line doubling or other resizing. And as Amiga video can be very flexible it is very difficult to fit all video modes with high quality at the same time (and keep FPGA price low).
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