Search found 13 matches

by ExCyber
Mon Apr 27, 2020 10:54 pm
Forum: MiSTer
Topic: HDMI ARC issues
Replies: 13
Views: 5448

Re: HDMI ARC issues

The schematic shows a 0-ohm resistor and a Schottky diode (I think) connected to pin 13 of the HDMI connector, but those components are both marked "DNI" (do not install), so it seems like the CEC pin wasn't meant to connect to anything in the production version of the board. Maybe this could be fix...
by ExCyber
Sun Dec 15, 2019 10:38 pm
Forum: MiSTer
Topic: GBA Core porting to Mister
Replies: 164
Views: 44515

Re: GBA Core porting to Mister

Is it technically possible, to save on SD card at the time the game progress is saved? People have tried to do this sort of thing before in emulators, but it turns out to be a little tricky. One approach that could be done on an FPGA system would be to have a timer such that a write to save memory ...
by ExCyber
Fri Dec 06, 2019 4:06 am
Forum: MiSTer
Topic: GBA Core porting to Mister
Replies: 164
Views: 44515

Re: GBA Core porting to Mister

There are definitely a couple graphical problems with the core, but in most cases they don't affect playability, e.g. brief flashes of garbage during scene/menu transitions. Maybe I just don't know what to look for, but I didn't notice anything blatantly corrupted for the first few minutes of Zero M...
by ExCyber
Thu Dec 05, 2019 2:59 pm
Forum: MiSTer
Topic: MegaCD (SegaCD) Core
Replies: 84
Views: 20944

Re: I get a static image of the SEGACD bios, unable to load any game

Note sure what that means, but I can confirm to you that all 5 cue files in there "pregap" for track 2. I don't think the cuesheet is somehow invalid, I just think mixing those statements in the same file runs a higher risk of hitting bugs (compared to e.g. a track-per-file structure using PREGAP o...
by ExCyber
Thu Dec 05, 2019 4:52 am
Forum: MiSTer
Topic: MegaCD (SegaCD) Core
Replies: 84
Views: 20944

Re: I get a static image of the SEGACD bios, unable to load any game

It's been a long time since I've studied CD structure and CUE files, but something seems odd to me about how track 2 uses PREGAP while the subsequent tracks use INDEX 00. I believe that these two statements both encode pregap size, but imply different things about the relationship between the pregap...
by ExCyber
Thu Nov 14, 2019 3:07 pm
Forum: MiSTer
Topic: ao486
Replies: 238
Views: 54092

Re: ao486 Performance Technical Discussion

My understanding is that the dirty bit is supposed to be assigned by the cpu on a write to the page to indicate the cache entry is out of date. What's strange is that the cache entry is invalidated if it's _not_ dirty, which seems backwards. I didn't word this very well in my previous post, but I t...
by ExCyber
Thu Nov 14, 2019 6:10 am
Forum: MiSTer
Topic: ao486
Replies: 238
Views: 54092

Re: ao486 Performance Technical Discussion

My Verilog is rusty, so feel free to take this with a grain of salt: 1) selected isn't assigned/set until line 309. (Is this a problem?) I don't think this is a problem. It's an assign statement (as opposed to a blocking assignment in an always block), in which case I don't believe order has any eff...
by ExCyber
Tue Nov 12, 2019 2:22 pm
Forum: MiSTer
Topic: ao486
Replies: 238
Views: 54092

Re: ao486 Performance Technical Discussion

Another thing to consider is whether the cache is write-back or write-through. If it's write-through (as I think it was on all first-generation 486 chips), write-heavy workloads will always be slow. Such a cache is called "write-through" because each write is stored in both the cache and the memory ...
by ExCyber
Sun Nov 10, 2019 10:26 pm
Forum: MiSTer
Topic: New Atari Jaguar and GBA cores!
Replies: 4
Views: 2460

Re: New Atari Jaguar and GBA cores!

Do you guys know how to test the Atari Jaguar core available to download here? https://github.com/ElectronAsh/Jaguar_MiSTer_master I tried some .J64 dumps with no luck. Is a BIOS dump needed? Where should it be placed? I think the .rbf in that repo doesn't have HDMI output (due to being based on ol...
by ExCyber
Wed Nov 06, 2019 3:30 am
Forum: MiSTer
Topic: ao486
Replies: 238
Views: 54092

Re: ao486 Performance Technical Discussion

We really didn't use the SX versions in the U.S. We basically went from the 38, briefly to the 486, and straight to the Pentium (math bug and all). There were a slew programs that required the FPU to run by the time the 486 was popular. I am certainly not complaining. I was pointing out that the la...
by ExCyber
Tue Sep 03, 2019 1:58 pm
Forum: MiSTer
Topic: X68000 core
Replies: 122
Views: 43205

Re: X68000 core

The latest update seems to say something about fixing a problem with palette words being incorrectly byteswapped in some situations. I doubt that this is "the" graphics update everyone is waiting for (the corrupted sprites I've seen look to me more like a bug with fetching pattern data), but it's at...
by ExCyber
Mon Aug 26, 2019 1:54 pm
Forum: MiSTer
Topic: SNES core
Replies: 420
Views: 148456

Re: SNES core

What kind of cooling do you folks have for your boards? It seems that there's potentially some interaction between core build and temperature, so you might get different results based on ambient temperature, how long your board has been running, whether you have active cooling for the board or only ...
by ExCyber
Sun Aug 25, 2019 4:15 am
Forum: MiSTer
Topic: SDRAM board
Replies: 480
Views: 236944

Re: SDRAM board

I haven't run it for an extended period at 90 MHz, but I definitely see bursts of errors specific to 90 MHz with an XS v1.1 board from CBMstuff.com (Jim Drew) with a Winbond chip. Also, sometimes when I switch to 140 MHz, the cycle counter doesn't increment. I don't see that with any other speed. Th...

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