Handheld MiSTer project

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amadama
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Handheld MiSTer project

Post by amadama »

Hi everyone,
I am embarking on a project to build a handheld MiSTer device similar in size to a SEGA Nomad.
Will have:
5-6" 4:3 display (maybe larger, looking for panel at the moment)
DE-10 nano with SDRAM
Powered by 18650 batteries
internal USB HUB with internal USB connected controller.

First step will be very basic with no external outputs other than extra USB ports. Later may have audio out.

Before I start getting along with this I wanted to check with the community here to see if anyone else is already working on something like this. Suggestions are appreciated.
Thanks!

See below for images of a handheld Wii device known as the G-Wii created by Gman. I am using his overall design as a reference for mine.

https://bitbuilt.net/tag/wii/
Image
Image
Sorgelig
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Re: Handheld MiSTer project

Post by Sorgelig »

It's definitely doable if you have enough motivation.
The hardest part will be the case. The one from your pics made by expensive industrial 3D printer. Very expensive.
Locutus73
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Re: Handheld MiSTer project

Post by Locutus73 »

Following my daydream in another post, I think a clamshell design is better suited for a device like MiSTer which handles both retro consoles and computers.
Something resembling a GPD WIN
Image
(first model)

Image
(second model)

or a DragonBox OpenPandora or Pyra
Image

Regards.

Locutus73
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Newsdee
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Re: Handheld MiSTer project

Post by Newsdee »

I have a GPD Win, I dreamed of having a Windows PC like that for years. It's great but it tends to overheat noticeably. I'm not sure if they improved it for the GPD Win 2.

This is probably doable with a custom PCB but then it's more of a MiST than MiSTer.

I do like the NDS style clamshell design better. It feels more protected and less prone to scratching.
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telengard
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Re: Handheld MiSTer project

Post by telengard »

I had a GPDWin and really didn't like it. Awkward center of gravity and the hinge was always loose (even new). It was nice having the keyboard though. I wonder if an on-screen keyboard could be implemented?

Something more akin to the G-Wii would be ideal (for me at least).
jemismyname
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Re: Handheld MiSTer project

Post by jemismyname »

I loooooove this idea! I definitely vote for a GPD-Win clamshell type design... Nintendo (3)DS style fo-eva!!

also, an integrated keyboard would be invaluable in order to fully support the computer cores...

I can't wait to see the "Wicked Gamer and Collector" on youtube review this!!

"Package from CHINA!!!" lol
amadama
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Re: Handheld MiSTer project

Post by amadama »

I'm at wits end trying to find a good screen for this project and would love some help and input on this.

I'm trying to find a 4:3 aspect ratio LCD/OLED screen that is 5-8" in size.
Can someone give me some recommendations here?
Thanks!
RandomRonn
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Re: Handheld MiSTer project

Post by RandomRonn »

amadama wrote:I'm at wits end trying to find a good screen for this project and would love some help and input on this.

I'm trying to find a 4:3 aspect ratio LCD/OLED screen that is 5-8" in size.
Can someone give me some recommendations here?
Thanks!
Have you considered using one of the old PSOne screens? They are the correct size and aspect ratio, and have everything pretty much wired up already for you.
Scralings
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Re: Handheld MiSTer project

Post by Scralings »

I am by no means an authority on this type of thing but you could check out http://m.panelook.com/resmodlist.php?st ... =-1&best=0

Those are the 1024x768 4/3 panels. Quite a few 8” I didn’t dig deep yet. One thing I would prioritize is response time and color depth. Also it would be best to use an IPS for some of the arcade cores although flipping it sideways with out a USB port would be moot. A lot of the vendors you have to contact to get information about the response time 25 is typical for ips however with that comes a ghosting effect I can’t stand.
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Re: Handheld MiSTer project

Post by Sorgelig »

I would also drop all glared screens right away. It's awful to look at display and see yourself as in mirror.
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Re: Handheld MiSTer project

Post by bazza12 »

Sorgelig wrote:It's awful to look at display and see yourself as in mirror.
depends how vain you are sorg hehe 8)
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Re: Handheld MiSTer project

Post by Mills »

Anyone tested some of the raspberry pi lcd screens? (like this: https://www.waveshare.com/3.5inch-hdmi-lcd.htm)

The 480x320 resolution is not very good for many cores, I wanted to test gameboy core (if it can be scaled to 2x = 320x288).
Sorgelig
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Re: Handheld MiSTer project

Post by Sorgelig »

Mills wrote:Anyone tested some of the raspberry pi lcd screens? (like this: https://www.waveshare.com/3.5inch-hdmi-lcd.htm)

The 480x320 resolution is not very good for many cores, I wanted to test gameboy core (if it can be scaled to 2x = 320x288).
It's important to make sure it's horizontal display.
Some displays are vertical and relay on RPi GPU settings allowing to rotate the video to 90 degree. MiSTer cannot rotate the video.
Mills
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Re: Handheld MiSTer project

Post by Mills »

Sorgelig wrote:
Mills wrote:Anyone tested some of the raspberry pi lcd screens? (like this: https://www.waveshare.com/3.5inch-hdmi-lcd.htm)

The 480x320 resolution is not very good for many cores, I wanted to test gameboy core (if it can be scaled to 2x = 320x288).
It's important to make sure it's horizontal display.
Some displays are vertical and relay on RPi GPU settings allowing to rotate the video to 90 degree. MiSTer cannot rotate the video.
I might test it when I get the mister boards. If it is horizontal, would it fit in the middle like this?:
1.png
And if it is vertical it would just fit at the top. But as you said it won't work with mister.
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Sorgelig
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Re: Handheld MiSTer project

Post by Sorgelig »

you will need to use integer scaling if you want to avoid the blurry scaling. Since this screen has very low resolution, any non-integer scaling will look bad on this screen.
Mills
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Re: Handheld MiSTer project

Post by Mills »

I got the 480x320 lcd and tested it with my PC (don't have the fpga board yet).
It seems to work like an ordinary hdmi monitor, but it looks like it can't handle 60 Hz very well, because I can see a diagonal tearing when scrolling windows or games etc... :?.

It behaves just like the 3.5 kedei in this video:
https://www.youtube.com/watch?v=1yvmvv0KtNs&t=35s

So I guess this screen is not very good for the project :(.
Mills
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Re: Handheld MiSTer project

Post by Mills »

So, here it is, the "MiSTer Pocket", running Mega Drive / Genesis core (I still don't have the SDRAM to test Game Boy):
mp1.jpg
mp2.jpg
It is a bit taller than a GB Pocket because of the metal bars, I wonder If they can be removed :?:
mp3.jpg
The screen has tearing effects, but they are not very noticeable, games are playable and look crisp and smooth.

SDRAM won't fit if I use that raspberry pi HDMI adaptor, so I'll have to use a short HDMI cable, and place the screen at the bottom side of the de10 nano.
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normal19
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Re: Handheld MiSTer project

Post by normal19 »

You can unscrew the metal stands with pliers, theyre two halves attached to each other
Mills
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Re: Handheld MiSTer project

Post by Mills »

normal19 wrote:You can unscrew the metal stands with pliers, theyre two halves attached to each other
Thanks, I was afraid of damaging the board. So now is "thinner".

Do not use this inside a gemaboy-like case with some demanding cores (ao486), as it reaches temperatures a bit uncomfortable :lol:
Mills
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Re: Handheld MiSTer project

Post by Mills »

Hey, are there any GPIO pins that output 5V for the portable LCD?.
I read in the DE10 nano docs, that GPIO1 pin 11 is 5V and pin 12 is GND, is it safe to connect the screen there?.

Thanks.

EDIT: I could not resist to test, if anyone is interested... yeah the LCD worked well. :).
Sorgelig
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Re: Handheld MiSTer project

Post by Sorgelig »

Mills wrote:Hey, are there any GPIO pins that output 5V for the portable LCD?.
I read in the DE10 nano docs, that GPIO1 pin 11 is 5V and pin 12 is GND, is it safe to connect the screen there?.

Thanks.

EDIT: I could not resist to test, if anyone is interested... yeah the LCD worked well. :).
of course you can. It's the main 5V power which is quite powerful. Should be enough to power the LCD.
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