Search found 2433 matches

by ijor
Tue Apr 10, 2018 4:43 pm
Forum: Hatari
Topic: Multi-Core support with Hatari?
Replies: 9
Views: 649

Re: Multi-Core support with Hatari?

This has been discussed already. It does not make much sense, not only because it is complicated to get the synchronization right, but mainly because hatari tries hard to do cycle exact emulation of both the cpu, video system, dsp etc., and the subprocesses (or threads) would most of the time just ...
by ijor
Wed Mar 21, 2018 2:01 pm
Forum: MiSTer
Topic: ATARI ST Core
Replies: 10
Views: 990

Re: ATARI ST Core

It is not only about the CPU. Among other things, a cycle accurate GLUE is required for overscan and sync scroll, FDC must be precise for copy protected disk images to work correctly, etc, etc ... The bar might be a little high, but it is not that far as it might seem. I have building blocks for mos...
by ijor
Tue Mar 20, 2018 1:17 am
Forum: MiSTer
Topic: ATARI ST Core
Replies: 10
Views: 990

Re: ATARI ST Core

As I said in some other thread, I am willing to port the ST core. But being obsessive about cycle accuracy, I don't want to just port it without implementing major improvements in this aspect. So I need to find the time for that. I need to finish a couple of "real life" projects and I migh...
by ijor
Sun Mar 18, 2018 11:17 am
Forum: Applications
Topic: Atari ST Protection Technioques
Replies: 17
Views: 1452

Re: Atari ST Protection Technioques

There was no copy protection on the version I uploaded above. Or at least the original disk copied OK with FCOPY (no errors) and everything seemed to work OK from the copy. Strange considering that it is from the same author and same publisher as the 8-bit version, but oh well. The copy protection ...
by ijor
Sat Mar 17, 2018 11:08 pm
Forum: Applications
Topic: Atari ST Protection Technioques
Replies: 17
Views: 1452

Re: Atari ST Protection Technioques

I don't remember about the ST version. But the 8-bit version of the disk is heavily copy protected. The protection is (also) present as a demo of the disk protection techniques. It's very possible, even likely, that the ST version is copy protected as well.
by ijor
Fri Feb 23, 2018 1:16 am
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

Another problem with PSRAM/HyperRAM is max of 128MBit per chip. SDRAM used in MIST/MiSTer is 256MBit. So, for compatibility you need to use 2 chips which will give more troubles. PSRAM is actually DDR requiring diff-clock and much cleaner signals to operate. Currently, i see more troubles than adva...
by ijor
Thu Feb 22, 2018 9:51 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

Your understanding is wrong. Auto-refresh is not hidden. HyperRAM has special output signal which shows refresh cycle, so host has to suspend any operations till this signal become inactive again. You cannot control it. You only can wait for it. It's the same as DDR3 with HW memory controller used ...
by ijor
Thu Feb 22, 2018 9:01 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

I don't have personal experience with these HyperRAM, but as I understand they aren't exactly "PSEUDO-SRAM". They behave more like SDRAM with a hidden auto refresh. In this case you do have partial control of the refresh time. As long as you idle the RAM frequently enough, it will refresh ...
by ijor
Thu Feb 22, 2018 11:28 am
Forum: Pasti & VAPI
Topic: Quickstart guide for making Pasti-images
Replies: 8
Views: 7052

Re: Quickstart guide for making Pasti-images

Is it possible to have the image file saved onto the PCs hard-drive instead of to the transfer floppy drive? I got the feeling it only worked when writing to a transfer floppy when checking the read me file. The thing is that the PC with an FDC is at my mums place and my ST is at my place. So I wou...
by ijor
Wed Feb 21, 2018 3:00 pm
Forum: Pasti & VAPI
Topic: Quickstart guide for making Pasti-images
Replies: 8
Views: 7052

Re: Quickstart guide for making Pasti-images

A bit of a necro post this, but since the PASTI software is still relevant, I thought what the hell :). Is there a way to have PastiTools.exe write to an image file on the PC HD instead of to a floppy transfer disk? I'm not sure what you mean. PastiTools precisely creates and writes to an image fil...
by ijor
Tue Feb 20, 2018 10:25 pm
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

I don't know why VRR is required. It's more a formal writing of limits. Current HDMI v1.4 is able to use any frequencies. ... I have small 7" HDMI monitor. It supports HDMI video with wide tolerance. It accepts any pixel clock i throw on it. But it does frame rate conversion into its internal ...
by ijor
Mon Feb 19, 2018 1:55 pm
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

HDMI 2.1 supports Variable Refresh Rate, so, hopefully, in the future we’ll see TV sets perfect for modern and retro computing/gaming. How does MiSTer (and other FPGA based platforms like Super NT and OSSC) implement HDMI? I mean: is it just an HDMI socket and some basic electronics (caps, resistor...
by ijor
Sun Feb 18, 2018 2:19 am
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

Sorgelig wrote:I don't agree.
There are options much better than GBS and cheaper than XRGB.
Some LKV scalers are very good. Read my posts in VGA upscaling experiments thread.


Thanks for the pointer. Will check that thread thoroughly.
by ijor
Sun Feb 18, 2018 2:18 am
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

Just out of curiosity: don’t modern USA TV sets support 50Hz through HDMI? Even if they do, it doesn't mean it will accept the 50Hz non-standard signal produces by many retro systems. In some cases you might even need refresh rate conversion from 60Hz to 60Hz for this very same reason. Btw, I also ...
by ijor
Sun Feb 18, 2018 2:14 am
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

But I'm just sticking to the original question about handling the conversion, for which not many options seem to exist. Next step above the GBS seems to be the XRGB, which works but is quite a leap in price. So those are the only two devices that perform frame buffer refresh rate conversion? I assu...
by ijor
Sat Feb 17, 2018 1:38 am
Forum: FPGA Chat
Topic: Analogue Super NT
Replies: 58
Views: 3502

Re: Analogue Super NT

Since some people here seem to have quite some experience with the issue. What you would recommended for an affordable decent VGA to HDMI upscaler with frame buffer? I don't mind the lag at all, but I do need/want refresh rate conversion . I'm looking for something affordable, the OSSC and the XRGB ...
by ijor
Sat Feb 17, 2018 1:30 am
Forum: News & Announcements
Topic: Paul Woakes
Replies: 13
Views: 2385

Re: Paul Woakes

Sad news. A very talented developer. RIP
by ijor
Tue Feb 13, 2018 7:52 pm
Forum: FPGA Chat
Topic: Decapping fundraisings
Replies: 10
Views: 730

Re: Decapping fundraisings

It was my understanding that decapping was very expensive and required non domestic high-specialized equipment. I mean, software development, even the most qualified and refined, can be done at home and good developers are not a rare resource in the retro community (mostly nerd and geeks like us :D...
by ijor
Tue Feb 13, 2018 6:21 pm
Forum: FPGA Chat
Topic: Decapping fundraisings
Replies: 10
Views: 730

Re: Decapping fundraisings

... and a solid, trustable, fund raising platform. Forgot to comment about that. I am not fan of the fund raising of these kind of projects. The decapping cost is affordable (I paid a a couple from my own pocket), and some people have the equipment to do it for free. Then of course that it takes an...
by ijor
Tue Feb 13, 2018 5:08 pm
Forum: FPGA Chat
Topic: Decapping fundraisings
Replies: 10
Views: 730

Re: Decapping fundraisings

I'm not sure about the Amiga chipset, but most classic CPUs and lots of custom chips are already decapped. See, for example, http://www.visual6502.org/ I made several decap contributions myself, including reverse engineered schematics of both the Atari 8-bit (complete) and the ST (partial) custom ch...
by ijor
Mon Feb 12, 2018 12:09 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

Sorgelig wrote:All future posts about me will be deleted.


Fair enough. But please stop posting about me then. You made much more posts about me, than me about you, and I didn't delete them.
by ijor
Sat Feb 10, 2018 8:12 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

Linux is booting, but I'm not sure if it doesn't trigger null pointer exceptions or something else on other boards in U-Boot code. More likely Linux kernal hangs on start due to incompatible record in device tree. But what kind of record in the tree could be compatible with one SOC chip but incompa...
by ijor
Sat Feb 10, 2018 8:06 pm
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

May be because you want to point me how i'm unfrendly with you? You've quoted the part without answers. So you didn't see my answers in the same post? You always like to teach me how to do, where i'm wrong. But you don't want to learn at the same time. You look like much smarter than me according t...
by ijor
Sat Feb 10, 2018 2:06 am
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

If you will afraid to try then you won't be able to do anything ... U-boot boot process is script driven, so the whole booting sequence can be modified from console by changing environment variables. ... Come on Sorgelig, why are you always so unfriendly? Should I spend hours performing some tests ...
by ijor
Sat Feb 10, 2018 12:00 am
Forum: MiSTer
Topic: MiSTer on DE10-Standard - needed?
Replies: 54
Views: 2876

Re: MiSTer on DE10-Standard - needed?

I don't have those boards, so i cannot test. Why don't try to test and solve the problems by yourself as you have those boards? I didn't ask you to perform any test. I just asked you a couple of questions about your kernel build. If you know already that U-boot will fail if the SOC chip is not comp...

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