Search found 151 matches

by paulbnl
Wed May 13, 2020 7:24 pm
Forum: MiSTer
Topic: Atari 2600
Replies: 175
Views: 55681

Re: Atari 2600

Scandoubler also works with original sync.

Maybe because those games enable Vsync only about half a line before Vblank so most of Vsync is active during Vblank.
by paulbnl
Wed May 13, 2020 6:14 pm
Forum: MiSTer
Topic: Atari 2600
Replies: 175
Views: 55681

Re: Atari 2600

I found some games that enable Vsync before Vblank: Battlezone, Pac-Man, Secret Quest. The scaler works fine with original sync even with those games. I have added an auto switch that outputs the original Vsync normally and switches to generated Vsync if a game starts Vsync before Vblank. It works w...
by paulbnl
Tue May 12, 2020 6:01 pm
Forum: MiSTer
Topic: Atari 2600
Replies: 175
Views: 55681

Re: Atari 2600

I have being doing some testing and the vertical position on CRT is much better with the original Vsync of the core instead of the regenerated one.

Sorgelig which games have issues with the original Vsync?
by paulbnl
Sat May 09, 2020 4:18 pm
Forum: MiSTer
Topic: Original analog video without I/O board? Possible!
Replies: 327
Views: 69343

Re: Original analog video without I/O board? Possible!

Ah, I do not have the IO board, I just have HDMI/VGA Dongle. Hopefully I am still okay with no modifications? I saw an earlier post that mentioned something about having to modify the dongle? That was said in the first post. You need to modify the HDMI to VGA adapter otherwise you don't have sync w...
by paulbnl
Fri May 08, 2020 12:22 pm
Forum: MiSTer
Topic: I/O Board
Replies: 436
Views: 221183

Re: I/O Board

240 Ohm is too low for the R2R DAC. That results in 0.786 vpp. (3.3 x 75 / (240 +75)). However for proper 75 Ohm output impedance, 180/360 arrays should be used with a 130 Ohm resistor to ground on the output. That gives 3.3 x 130 / (180+130) = 1.38v with 180x130 / (180+130) = 75.48 Ohm impedance. T...
by paulbnl
Mon May 04, 2020 7:32 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1404
Views: 317598

Re: Minimig (Amiga) core discussion

in addition do you think would be possible to set the vertical frequency for pal mode to a value closer to the 50hz standard for smoother scrolls in some tv's and scalers? Thanks ;) video mode on Amiga is programmable and it depends on specific game/app which refresh it outputs. The core clock is f...
by paulbnl
Thu Apr 30, 2020 5:36 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1404
Views: 317598

Re: Amiga Core with OSSC.

Hi all! I'm having some trouble making the Amiga core to work with my OSSC (fw 0.85a). Many times, when I start the core, my OSSC loses the sync and I have to turn it off and on many times, until it gets sync and works. This is because the Vsync is wrong compared to a real Amiga. I still have to te...
by paulbnl
Fri Apr 24, 2020 12:04 pm
Forum: MiSTer
Topic: Mister on arcade cabinet using jammasd
Replies: 11
Views: 1199

Re: Mister on arcade cabinet using jammasd

@paulbnl, If the RGB line does have an issue, i will have also an issue with my computer on 15Khz I guess Your computer outputs standard video 1.4volt @ 75Ohm impedance. I don't know what voltage and impedance the IO board outputs but based on your result it is probably higher than standard. With 7...
by paulbnl
Wed Apr 22, 2020 9:59 am
Forum: MiSTer
Topic: Mister on arcade cabinet using jammasd
Replies: 11
Views: 1199

Re: Mister on arcade cabinet using jammasd

Maybe the Jammasd does not terminate the RGB lines with 75 Ohm to ground before the video amp.

You can try to use Directvideo with HDMI->VGA convertor.
by paulbnl
Wed Apr 15, 2020 3:27 pm
Forum: MiSTer
Topic: Original analog video without I/O board? Possible!
Replies: 327
Views: 69343

Re: Original analog video without I/O board? Possible!

Did you remove the dongle for this test? (DE-10 port directly to OSSC) The OSSC is an analog to digital converter so that is not possible. I did some testing with below patch and it seems to be working well. It outputs 240p directly without outputting 1080p first. diff --git a/sys/sys_top.v b/sys/s...
by paulbnl
Wed Apr 15, 2020 11:47 am
Forum: MiSTer
Topic: Original analog video without I/O board? Possible!
Replies: 327
Views: 69343

Re: Original analog video without I/O board? Possible!

I have tested loading cores with Directvideo into an OSSC. MiSTer outputs 1080p RGBHV for about half a second before switching to Directvideo mode. I am guessing this is because it takes a short while to enable Directvideo on the FPGA side. A fix would be to start out with Directvideo enabled on the...
by paulbnl
Sat Apr 11, 2020 2:12 pm
Forum: MiSTer
Topic: VGA output questions and problems
Replies: 85
Views: 5554

Re: VGA output questions and problems

It depends on the TV but if you are using Directvideo then it is a requirement.
by paulbnl
Sat Apr 11, 2020 9:53 am
Forum: MiSTer
Topic: VGA output questions and problems
Replies: 85
Views: 5554

Re: VGA output questions and problems

My math gives me 59.29Hz for those numbers. (4800000 / 309 / 262).

Did you align Vsync with Hsync start?
by paulbnl
Sat Apr 11, 2020 9:49 am
Forum: MiSTer
Topic: PC Engine core
Replies: 456
Views: 95120

Re: PC Engine core

Yea I forgot about that. I have sent a pull request with the change.
by paulbnl
Thu Apr 02, 2020 8:37 am
Forum: MiSTer
Topic: Joystick testing thread
Replies: 693
Views: 194870

Re: Joystick testing thread

Jeebs wrote: How do we go about doing that?
You have to ask Sorgelig nicely. :)
by paulbnl
Wed Apr 01, 2020 11:05 am
Forum: MiSTer
Topic: Joystick testing thread
Replies: 693
Views: 194870

Re: Joystick testing thread

After doing some further testing it looks like MiSTer_20200225 is the first binary that stopped the Mayflash SNES USB adapter from working properly for both Ports on the adapter and being able to use 1 and 2 player. That is the release with the new way of merging devices. The VID of your adapter ne...
by paulbnl
Tue Mar 31, 2020 3:47 pm
Forum: MiSTer
Topic: Gameboy core
Replies: 183
Views: 57585

Re: Gameboy core

For better input latency. I'm looking at the LCD code and it mentions a double buffer. So I'm wondering if when you turn on stability feature it adds 1 - 2 frames of lag, or does it work like the GBA sync to core buffer that is really fast? It adds about 0.4 frame latency to the 0-1 frame latency o...
by paulbnl
Fri Mar 20, 2020 9:11 pm
Forum: MiSTer
Topic: PC Engine core
Replies: 456
Views: 95120

Re: PC Engine core

Oh right yeah that's correct. The rar file contains the raw images. 240pSuite_lin.pce is the latest test version.

Thanks, that confirms the changes are correct. The 320 and 256 circle width being the same is the expected result.
by paulbnl
Fri Mar 20, 2020 8:45 pm
Forum: MiSTer
Topic: PC Engine core
Replies: 456
Views: 95120

Re: PC Engine core

Thanks! So these results are from the linearity-PCE.rar test version?
by paulbnl
Sat Mar 07, 2020 11:11 am
Forum: MiSTer
Topic: GBA Core porting to Mister
Replies: 164
Views: 39626

Re: GBA Core porting to Mister

Set vscale_mode=0 and vscale_border=0 for the GBA core. It is a bug in MiSTer with resolutions narrower than the 3:2 aspect of the GBA.
by paulbnl
Thu Mar 05, 2020 11:08 am
Forum: MiSTer
Topic: Original analog video without I/O board? Possible!
Replies: 327
Views: 69343

Re: Original analog video without I/O board? Possible!

I don't see any problems having 2V on TV sync. No one design TV where 2V instead of 1V external signal will damage it. Also TV MUST have 75 Ohm pull down resistor which together with internal I/O board 100 Ohm resistor will give just a little more than 1V. Yes with I/O board the 3.3V is lowered to ...
by paulbnl
Thu Mar 05, 2020 10:35 am
Forum: MiSTer
Topic: Original analog video without I/O board? Possible!
Replies: 327
Views: 69343

Re: Original analog video without I/O board? Possible!

By the way I have measured the CSYNC signal at the output with a scope and it's 2Vpp, exceeding 1V from SCART standard, so I propose using a 470 ohm resistor in series to get the signal attenuated to ~400mV. Indeed. Any VGA->SCART cable should have a resistor on the sync line. 2V may work for a whi...
by paulbnl
Sat Feb 29, 2020 10:57 pm
Forum: MiSTer
Topic: Joystick testing thread
Replies: 693
Views: 194870

Re: Joystick testing thread

so all 4 devices have all identical identifications. So i don't see how to distinguish them. They look like 4 parts of the same device. Yeah that's why the option in MiSTer.ini is needed to disable USB merge for these kind of devices. I've just pushed dual SNES to USB converter update based on Ardu...
by paulbnl
Fri Feb 28, 2020 5:20 pm
Forum: MiSTer
Topic: Joystick testing thread
Replies: 693
Views: 194870

Re: Joystick testing thread

It seems to be 1 USB device with 4 controllers.

@artfakt can you post the output of 'cat /proc/bus/input/devices'?
by paulbnl
Thu Feb 27, 2020 7:08 pm
Forum: MiSTer
Topic: PC Engine core
Replies: 456
Views: 95120

Re: PC Engine core

The vertical resolution makes a difference because the big circle was enlarged for the 240 lines so of course it is wider compared to the 224 version.

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