Search found 2751 matches

by ijor
Wed Nov 07, 2018 12:36 am
Forum: MiSTer
Topic: Scaler
Replies: 185
Views: 16896

Re: Scaler

Sometimes i don't understand why you tell obvious things. MiSTer sources are available, so you already know it includes fractional PLL calculation for HDMI and adjust the output pixel clock to the tolerance level of Cyclone V PLL. Basically you teach me how to make what I've done almost half year a...
by ijor
Tue Nov 06, 2018 9:35 pm
Forum: MiSTer
Topic: Scaler
Replies: 185
Views: 16896

Re: Scaler

input_period*input_total_pixels == output_period*output_total_pixels. This is what vsync_adjust option already does. As input_total_pixels and output_total_pixels are both hardcoded, relation between input_clock and output_clock won't be a pretty number. So, there always will be small difference. I...
by ijor
Tue Nov 06, 2018 9:06 pm
Forum: MiSTer
Topic: Scaler
Replies: 185
Views: 16896

Re: Scaler

P.S.: even with pixel clock adjust to tweak output frame rate, it's impossible to make it exactly match as output pixel clock won't be multiple of input pixel clock. It means output will slowly run away or late relative to input frame. With close clocks match and additional frame between, the teari...
by ijor
Tue Nov 06, 2018 2:04 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

funkychimp wrote:I have no sound using the core.


I think I found and I am fixing the issue that some people had no sound. The fix would be released shortly.
by ijor
Tue Nov 06, 2018 12:08 pm
Forum: MiSTer
Topic: MiSTer + OSSC
Replies: 16
Views: 3334

Re: MiSTer + OSSC

A few people here posted that they do use OSSC. However this is probably not the ideal setup for MiSTer. And unless you actually want to use a CRT, soon might not be been even needed. There is a new HDMI scaler being developed right now. It is not yet implemented, but the new scaler should be able t...
by ijor
Mon Nov 05, 2018 9:09 pm
Forum: MiSTer
Topic: HDMI video capture
Replies: 12
Views: 1473

Re: HDMI video capture

I finally went with the Avermedia Live Game Portable 2: https://www.avermedia.com/gaming/product/game_capture/live_gamer_portable_2 There are of course much better cards. But this one is affordable, works reasonable well, and as I wanted, it can record standalone directly to a SD card. No PC required.
by ijor
Mon Nov 05, 2018 4:22 pm
Forum: MiSTer
Topic: USB MIDI with Minimig and ao486 cores
Replies: 51
Views: 6582

Re: USB MIDI with Minimig/Amiga core

On on the Minimig I set /ttyS1 to 31250 bps which is what Amiga software expects and on ao486 I set it to 38400 which is what SodtMPU expects. Ah, ok. You are setting the bitrate manually. I thought that is supposed to be controlled from the FPGA side with the MiSTer API interface. @Sorgelig: What'...
by ijor
Mon Nov 05, 2018 10:31 am
Forum: MiSTer
Topic: MISTer MIDI interface
Replies: 5
Views: 1667

Re: MISTer MIDI interface

Is this still relevant? It's very simple for me to connect the MIDI signals. We only need to be 100% sure we are at the correct pins (may be worth to add a current limit resistor just in case).

Don't you need to connect midi through, or you don't care?
by ijor
Mon Nov 05, 2018 10:21 am
Forum: MiST
Topic: Genesis / Megadrive core ported to MiST
Replies: 832
Views: 105756

Re: Genesis / Megadrive core ported to MiST

Generally Genesis games are not required cycle accurate CPU (except couple demos specifically requiring it). Just because many games have bugs and by different reasons these bugs are hidden/eliminated due to specific place/time the cycle accurate CPU is good to have in Genesis. Yes, something simil...
by ijor
Mon Nov 05, 2018 10:16 am
Forum: MiSTer
Topic: USB MIDI with Minimig and ao486 cores
Replies: 51
Views: 6582

Re: USB MIDI with Minimig/Amiga core

I recompiled the MiSTer Linux kernel to support ALSA USB MIDI sound and wrote a user-space "midilink" program to take input from /dev/ttyS1 and push it to /dev/sequencer. ... Next I'm looking into altering MiSTer menu to have an option for MIDI for serial port as well as the existing Cons...
by ijor
Fri Nov 02, 2018 8:53 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

I decided to unplug the SDRAM and reseat and the core has suddenly started to work. One quirk though. I have no sound using the core. Any ideas? A few people reported the same problem. I need to investigate the cause. In the meantime, some of them found the following workaround. Run a different cor...
by ijor
Fri Nov 02, 2018 8:31 pm
Forum: MiST
Topic: Genesis / Megadrive core ported to MiST
Replies: 832
Views: 105756

Re: Genesis / Megadrive core ported to MiST

Hi, Ok, yes, the priority is an external thing but the CPU behaves differently depending on the level reported via IPL. My question was more or less: Are the IPL signals re-evaluated multiple times during one complete INT processing? E.g. there must be one point where the cpu detects that the IPL is...
by ijor
Fri Nov 02, 2018 3:02 pm
Forum: MiSTer
Topic: Prepare SD Card for MiSTer - OSX
Replies: 19
Views: 1897

Re: Prepare SD Card for MiSTer - OSX

I haven’t seen a resize program for exfat - that is the difference between this and the pi image. I saw a repo of exfat utilities but the resize was on the wish list You probably missed my reply about that a few days ago on the other thread: http://atari-forum.com/viewtopic.php?f=117&t=34594#p3...
by ijor
Fri Nov 02, 2018 1:55 pm
Forum: MiSTer
Topic: Prepare SD Card for MiSTer - OSX
Replies: 19
Views: 1897

Re: Prepare SD Card for MiSTer - OSX

Again, IMHO, providing a simple VHD/IMG as an alternate SD install method would solve all these problems.
by ijor
Fri Nov 02, 2018 1:53 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

SmokeMonster wrote:I posted a video about FX CAST last week: https://www.youtube.com/watch?v=VQiDpjVdtb4


Thanks a lot! :)
by ijor
Fri Nov 02, 2018 1:53 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

I have placed Atari St core on the root on my SD. I can load it and open the F12 options etc but whne I try and load a .st file nothing happens. I just get a black screen with a white border. Do I have to place any additional bios files etc. in the SD root? No BIOS/TOS rom files are needed for this...
by ijor
Tue Oct 30, 2018 4:04 pm
Forum: MiSTer
Topic: SD Card setup under Linux
Replies: 6
Views: 1010

Re: SD Card setup under Linux

I haven't seen a command line tool in linux to resize an exfat partition ... It seems like either we would need to patch one of the exfat tools to support resize, or ship a few different size images for common flash cards. 8,16,32,64 maybe. I wouldn't bother. This is just a failsafe method. Just pr...
by ijor
Tue Oct 30, 2018 2:49 am
Forum: SuperCard Pro Disk Copier
Topic: SCP image file format for emulators
Replies: 6
Views: 1827

Re: SCP image file format for emulators

Even for sector level images, cycle accuracy might need the whole image to be loaded into RAM. In my case I'm using SDRAM, but using DDR is probably good enough. DDR at the MiSTer is not slower, it just has a more variable and less predictable latency. But even when it is indeed possible to load hug...
by ijor
Tue Oct 30, 2018 2:37 am
Forum: MiSTer
Topic: SD Card setup under Linux
Replies: 6
Views: 1010

Re: SD Card setup under Linux

IMHO, it would be great if one of the Linux experts here would create a simple writable VHD/IMG image. Even for Windows user, this would provide an alternate safe method when for some reason the SD creator fails. I know that an image would not use the whole capacity of the card. But it is not too di...
by ijor
Tue Oct 30, 2018 2:31 am
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

I just published a video on FX CAST. Instead of gameplay, I went with demoscene productions. https://youtu.be/0KeCrWIQVTY Thank you. Great video! Do you think you could include an option for the Atari ST MIDI port to map to a device (such as /dev/ttyS1) which is accessible in the MiSTer Linux? I'm ...
by ijor
Sat Oct 27, 2018 2:48 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

Ijor, I was thinking about the image size generated by SCP with it's default settings. I could actually cut the image size in half. There is an option to use any number of bits for storing the flux data. By default, the bitcells entries are stored as 16 bits (word) wide. I could make an option to c...
by ijor
Sat Oct 27, 2018 1:34 pm
Forum: MiST
Topic: Genesis / Megadrive core ported to MiST
Replies: 832
Views: 105756

Re: Genesis / Megadrive core ported to MiST

Ok, yes, the priority is an external thing but the CPU behaves differently depending on the level reported via IPL. My question was more or less: Are the IPL signals re-evaluated multiple times during one complete INT processing? E.g. there must be one point where the cpu detects that the IPL is !=...
by ijor
Sat Oct 27, 2018 1:15 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

The same MFP chip is used in the classic Mac and SGI Indy as well, IIRC? Although I could be remembering that wrong. I've seen some of the videos of FX CAST by bbond and others, and it looks great. ;) I'm very glad to hear your core is written in Verilog / SystemVerilog as well. I find VHDL a bit h...
by ijor
Thu Oct 25, 2018 4:03 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 110
Views: 14130

Re: FX CAST Atari ST core

Yes, I am running at 50Hz, and Video Frequency is set to AUTO, and I see these hiccups every 10-15 seconds (does not look like tearing at all, but a hiccup in smooth-scrolling parts in cracktros, demos and fine-scrolling games). My guessing here is that some monitors convert some video modes freque...
by ijor
Thu Oct 25, 2018 3:28 pm
Forum: MiST
Topic: Genesis / Megadrive core ported to MiST
Replies: 832
Views: 105756

Re: Genesis / Megadrive core ported to MiST

Interesting observations about interrupt delay in M68k: http://gendev.spritesmind.net/forum/viewtopic.php?f=2&t=2202 I didn't know the Genesis has 6800 interrupts. Yes, the timing of the interrupt ack cycle is affected in that case and it is synchronized to the E clock signal. That is implement...

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