Search found 2274 matches

by ijor
Thu Nov 16, 2017 7:33 pm
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

I am constraining the HDMI interface. But not completely sure what you are doing at the code Sorgelig. Let's see if I get it right. - The VIP module receives the HDMI clock inverted in relation to the output clock. This is, I assume, for the purpose to improve timing margin. - The output of the VIP ...
by ijor
Thu Nov 16, 2017 3:26 am
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

Naive question. Are these constraints why it's useful to measure timings in original hardware with an oscilloscope? Because it allows feeding the timing constraints from the original machine? Not too much. Constraints for the external I/O ports are mostly based on the specifications of the external...
by ijor
Thu Nov 16, 2017 3:15 am
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

What is really need is specific commands in SDC (like that you've posted). Universal settings and specific to ao486 core are both welcome. The main problem is not understanding how FPGA signals are working, but concrete commands reducing the compilation time and improving the signals timing. Ok. As...
by ijor
Wed Nov 15, 2017 8:43 pm
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

Thanks for concrete offer for sdc. That addition should be universal for all cores. As for ao486 - any help with specific to this constraints are welcome. Even for version with slower clock. I won't offer a slower version of ao486 (although anyone can offer if want) but any additional constraints w...
by ijor
Wed Nov 15, 2017 12:07 pm
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

So if I understood correctly the core would be more stable at 50Mhz with information telling the "compiler" how to use FPGA space. Albeit it might cause some glitches if for some reason the constraints goes against the original design intent. Is that the gist of it? Yes, more or less. The...
by ijor
Wed Nov 15, 2017 12:00 pm
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

Original design is targeted to 30MHz. So probably all timing issues can be solved at this master clock. But the big problem of this core is emulated speed. CPU model requires much more clocks to execute instructions than original i486 CPU. Ah, I didn't know that. What a pity. Yes, I agree that it m...
by ijor
Wed Nov 15, 2017 4:38 am
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

Re: ao486 core: constrains and timing issues

The other problem is that the CPU clock at 90 MHz is too fast. After cutting the clock transfers some timing violations remain. They are mostly setup (not hold) issues on the CPU clock. They are not clock transfers. They are paths within the same clock. Conceivable some of the failed paths are false...
by ijor
Wed Nov 15, 2017 4:21 am
Forum: MiSTer
Topic: DE-10 nano temperature issues
Replies: 36
Views: 846

Re: DE-10 nano temperature issues

yes. it fails at the router. Placement doesn't take much time. only small fraction of the whole time. Router takes >90% of the whole compilation times. I know. I "experienced" that myself when trying to compile. I created a specific thread for the issue: http://atari-forum.com/viewtopic.p...
by ijor
Wed Nov 15, 2017 4:18 am
Forum: MiSTer
Topic: ao486 core: constrains and timing issues
Replies: 17
Views: 384

ao486 core: constrains and timing issues

The ao486 is a big core. Compiling the full version (as it is configured now) takes a lot of time. Most of the time, by far, is spent by the router. The router is the compiler module that wires the logic connections inside the FPGA. In some cases it can even fail to route the design. Looking at the ...
by ijor
Tue Nov 14, 2017 7:18 pm
Forum: MiSTer
Topic: DE-10 nano temperature issues
Replies: 36
Views: 846

Re: DE-10 nano temperature issues

Some cores like ao486 impossible to tweak to make it work reliably with any temperature of FPGA. Core is too big and even without much constrains took more than hour to compile. I tried compiling this core, and at the end it seems it is actually the other way around. The reason that the ao486 cores...
by ijor
Tue Nov 14, 2017 3:00 pm
Forum: Games - General
Topic: Never Ported respectively released for ST
Replies: 130
Views: 28748

Re: Never Ported respectively released for ST

Indy 4 is just a huge game, with tons of graphics, so that's impossible to have someone rework all of them in 16 colors. ... the problem for releasing indy 4 on ST was technical, and not a market problem. Because they knew they would have sold lots of them on the ST, considering the huge license it...
by ijor
Mon Nov 13, 2017 4:24 pm
Forum: MIDI Software and Hardware
Topic: Note Wizard - Midi Music Lessons (Strange copy behavior)
Replies: 7
Views: 335

Re: Note Wizard - Midi Music Lessons (Strange copy behavior)

Thanks a lot for the pics ...

Seems it isn't a laser burnt hole after all. But a thin, home made, cut in the disk surface instead.
by ijor
Sun Nov 12, 2017 2:01 pm
Forum: MIDI Software and Hardware
Topic: Note Wizard - Midi Music Lessons (Strange copy behavior)
Replies: 7
Views: 335

Re: Note Wizard - Midi Music Lessons (Strange copy behavior)

Interesting, sound as a physically altered disk indeed. That's why the copy doesn't work. Not sure why the original doesn't, unless you write protected it. Writing to the disk is necessary to reliably detect this kind of protection. Assuming it is a laser burnt hole, it would be great if you could t...
by ijor
Sun Nov 12, 2017 11:57 am
Forum: CosmosEx
Topic: Support for other image formats
Replies: 9
Views: 390

Re: Support for other image formats

Thanks for your insight. I really don't know anything about this from a technical stand point. My goal is to use my TT030 with Cubase and run Studio Module as emulated disk that was stripped using Super Card Pro. But I don't know how to convert this image to be used in Cosmos EX. There are many MID...
by ijor
Sat Nov 11, 2017 1:51 am
Forum: Hardware
Topic: TOS: Now and When
Replies: 10
Views: 633

Re: TOS: Now and When

Eero Tamminen wrote:Has anybody documented / listed them anywhere?


Not that I know. But they are many.
by ijor
Fri Nov 10, 2017 11:28 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 190
Views: 7316

Re: Req : "Audio Sculpture" (STX,...) even not running...

JimDrew wrote:Hmm... I don't see this much variance with any setup I have here. How are you determining the number of samples?


Simply, from the track header of the SCP images.
by ijor
Fri Nov 10, 2017 9:34 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 190
Views: 7316

Re: Req : "Audio Sculpture" (STX,...) even not running...

SCP already looks at the target drive and adjusts the bitcells so they are the same length (in time) for the rotational speed of the target drive. This was necessary because sometimes people dump disks with a 360 RPM drive and then want to write them back on a 300 RPM drive. I typically see +/- 1 b...
by ijor
Fri Nov 10, 2017 1:15 pm
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 39
Views: 2017

Re: STFM to DVI/HDMI project

Yeah, great job ... !
by ijor
Fri Nov 10, 2017 11:46 am
Forum: CosmosEx
Topic: Support for other image formats
Replies: 9
Views: 390

Re: Support for other image formats

kodak80 wrote:I know this is a bit off topic but what about Pasti STX on a Gotek with the FlashFloppy or HxC firmwares? Would this be possible?


The HxC software can convert Pasti images to native HxC image format, HFE. But as Pera commented, some images work, others do not.
by ijor
Fri Nov 10, 2017 11:13 am
Forum: CosmosEx
Topic: Support for other image formats
Replies: 9
Views: 390

Re: Support for other image formats

I was meaning to help implementing support for copy protected images, and I might still. But there is a hardware limitation that makes it very difficult to support some protections. It was long ago since we talked with Jookie about that, but IIRC the main problem is the limited bandwidth between the...
by ijor
Fri Nov 10, 2017 12:54 am
Forum: MiST
Topic: NEW OR UPDATED ARCADE CORES
Replies: 293
Views: 29835

Re: NEW OR UPDATED ARCADE CORES

Sometimes it is possible to pool and combine multiple logical blocks in a single physical one. Since FPGA RAM is dual port, each logical block can be accessed independently, even with a different clock. Quartus can sometimes do this automatically. I don't remember if there is an option that must be ...
by ijor
Wed Nov 08, 2017 12:26 pm
Forum: MiSTer
Topic: DE-10 nano temperature issues
Replies: 36
Views: 846

Re: DE-10 nano temperature issues

i'm not an original developer of ao486. I know. Again, I wasn't complaining to you. Actually I wasn't exactly complaining at all, not even to the original developer. If it could be so easy to fix the timing problems by just looking at report files ... I didn't say that, not nearly, did I ??? But it...
by ijor
Wed Nov 08, 2017 12:00 pm
Forum: Coding
Topic: reducing the source file,removing empty lines etc
Replies: 15
Views: 569

Re: reducing the source file,removing empty lines etc

Real programmers don't use C (let alone some of the modern blasphemy like Java or Phyton). They only use assembler, and without comments of course.
by ijor
Wed Nov 08, 2017 11:55 am
Forum: MiSTer
Topic: DE-10 nano temperature issues
Replies: 36
Views: 846

Re: DE-10 nano temperature issues

I have zero clue in what goes in a constraints file, but I understand it as "cores can be optimized further". Not exactly. Constraining the design means providing all the data Quartus needs to perform a full and proper timing analysis. If the design is properly constrained Quartus should ...
by ijor
Wed Nov 08, 2017 11:42 am
Forum: MiSTer
Topic: DE-10 nano temperature issues
Replies: 36
Views: 846

Re: DE-10 nano temperature issues

I don't see ANY offer of help. Only complains, complains, complains. Calm down Sorgelig. Nobody was complaining here. Certainly I wasn't. Not at all. Well, my only complain was about your aggressive attitude. I just though (and I still think) that it is interesting to comment and exchange ideas abo...

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