Search found 3042 matches

by ijor
Sat Nov 23, 2019 7:39 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

dgarman wrote:But not with 64MB.


It works for others with a 64MB DRAM board. Please double check and remember to load an ST image file.
by ijor
Sat Nov 23, 2019 7:39 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

... I remember reading that inputs may be problematic with an unpowered hub, which i have (i tested with a keyboard, a mouse and a ps3 controller). And i can say that there are indeed problems, but they are very random: I still had no time to look into that issue. I suspect a combination of problem...
by ijor
Sat Nov 23, 2019 7:25 pm
Forum: MiST
Topic: Mister SNES port to MIST possible?
Replies: 279
Views: 42440

Re: Mister SNES port to MIST possible?

ManuhFeri wrote it uses -6 speed grade Alliance module, which has: tOH = 2.5, tAC(3) = 5 vs the one in the Micron datasheet for -75: tOH = 2.7 and tAC(3)= 5.4. Input setup/hold times are the same: 1.5/0.8 Yes, but I suspect the datasheets might be not 100% accurate about tOH for the faster speed gr...
by ijor
Sat Nov 23, 2019 4:32 pm
Forum: MiST
Topic: Mister SNES port to MIST possible?
Replies: 279
Views: 42440

Re: Mister SNES port to MIST possible?

I've uploaded the latest tweaks to the github repo, if you can compile it from there, you can experiment with phase shifts again. On my MiST it even accepts -1100 now (and passes the timing analysis + works, too). Or if you can spot some difference between the Hynix and Alliance datasheet, I'll loo...
by ijor
Sat Nov 23, 2019 4:31 pm
Forum: MiST
Topic: Mister SNES port to MIST possible?
Replies: 279
Views: 42440

Re: Mister SNES port to MIST possible?

To say what is the best value that works for me, without a doubt the 5 value works better but no well. Tested in a Mistica via rgb and my sdram memory is Alliance , maybe that will help. Only test 14 compiled with c0 at 1100 works estable in my mistica Can you please post a high rez picture of your...
by ijor
Fri Nov 22, 2019 4:16 am
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

Hmm I set Video Frequency to "Auto", and it correctly goes to 50 Hz for Color PAL, but it goes to 60 Hz for monochrome, not 72 Hz as expected. There might be a problem. I will check it. I read elsewhere that the FXCast core can support SMSQ/E. Is this still true on the Mister? SMSQ/E woul...
by ijor
Fri Nov 22, 2019 4:11 am
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

FX CAST 0.15 core. Experimental test version for newer SDRAM boards:
viewtopic.php?f=28&t=34554#p355935

It is experimental because I have currently no way to test the core with newer SDRAM boards. Those people with those boards, 64MB or 128MB, please let me know.
by ijor
Fri Nov 15, 2019 12:14 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

cputester for Minimig

I believe I found further bugs in cputester that I would like to confirm. Can somebody please provide me a disk image with the Amiga executable? Being almost Amiga illiterate, it is difficult for me to build it myself from sources. Best to PM and not post in the public thread.
by ijor
Fri Nov 15, 2019 12:06 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

I received my 64 MB sdram today, and the first thing i tested was this core ! :-) Sorry. Currently the new, extended SDRAM boards with 64MB or 128MB are not yet supported. Unfortunately, the core display a white screen and when i try to load an st file, nothing happens. You said the core should def...
by ijor
Fri Nov 15, 2019 11:57 am
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 332
Views: 133050

Re: FX CAST Atari ST core

Since I am using HDMI, I am also experiencing the previously reported problems that the core is not outputting 1080p but some other resolution. It seems it is not obeying my Mister.ini config file correctly, because I set 1080p there. In addition, and I hope this is actually a new issue, the output...
by ijor
Thu Nov 14, 2019 3:04 pm
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 21911

Re: FX68K Cycle accurate 68000 core

It was fixed in july/august when Toni started working on his 680x0 cputester and commited in WinUAE 4.3.0 beta 1 : LINK stacked value is saved before SP is decreased by 4. Only affects pointless LINK A7,#x variant. (All models except 68040) This is (obviously) about LINK , and not about UNLK , whic...
by ijor
Wed Nov 13, 2019 7:49 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

Re: Minimig (Amiga) core discussion

... As it happens, the 68000 gets the old content of the stack and the increment is discarded (I can elaborate exactly why this happens if somebody is interested). Sounds good. Thank you for sharing an excellent CPU core! I merely wanted to get these bits verified. I was able to run a few demos tha...
by ijor
Wed Nov 13, 2019 7:48 pm
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 21911

Re: FX68K Cycle accurate 68000 core

Elaborating from an issue raised on a different thread ... What happens when the instruction: UNLK SP is executed, and why? UNLK is designed to work on a different address register, not on the Stack Pointer. The official Motorola manual describes UNLK as performing the following sequence: An->SP,(SP...
by ijor
Wed Nov 13, 2019 6:59 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

Re: Minimig (Amiga) core discussion

But I confirmed that the FX68K UNLK A7 behavior is correct. Might be a cputest bug, or might be the data file is corrupt (or a bug on the data test generator)? Toni Wilen (cputest author) confirmed that he has seen the error himself sometimes, and that UNLK might issue a false error report. Accordi...
by ijor
Tue Nov 12, 2019 3:14 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

Re: Minimig (Amiga) core discussion

The Z flag on division overflow was fixed recently. Previously it might be correct or not depending on the compilation build. race condition? Can it be fixed for determined build? Yes, of course, it was fixed recently. Now you will (should) always get the correct behavior on every build. Please upd...
by ijor
Tue Nov 12, 2019 1:13 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

Re: Minimig (Amiga) core discussion

Just tried UNLK A7 in HRTMon and didn't find the problem. Also tried it in 68020 mode and got the same result. Can it be a bug of cputest? Unfortunately your report file doesn't include the dump from SP memory, so there is not enough input/output info to judge. I can't run cputester on real hardwar...
by ijor
Tue Nov 12, 2019 10:55 am
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 1271
Views: 265426

Re: Minimig (Amiga) core discussion

I ran cputester against fx68k core, got 3 hits. 2 were from div, which might be still fine since it's only CCR flags, but UNLK instruction looks like it has a real problem. The Z flag on division overflow was fixed recently. Previously it might be correct or not depending on the compilation build. ...
by ijor
Tue Nov 12, 2019 2:04 am
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 21911

Re: FX68K Cycle accurate 68000 core

Another couple of bugs were fixed. Please check github: https://github.com/ijor/fx68k
by ijor
Tue Nov 12, 2019 2:02 am
Forum: News & Announcements
Topic: FX68K Cycle accurate 68000 core
Replies: 56
Views: 21911

Re: FX68K Cycle accurate 68000 core

I’m new to hardware coding and I am experimenting a bit on this fx68k core. I am wondering, how to properly set up the enPhi1 and enPhi2 input signals which are not present on the original MC68000 chip. Can you provide any hints please ? This is explained on "fx68k.txt". There is also an ...
by ijor
Sat Nov 02, 2019 3:44 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 361
Views: 50725

Re: Work on the Minimig core?

One thing i have noticed is that if i rte from the illegal trap then the illegal instruction is executed again (and again ....). Is this correct behaviour? It is. The reason is that the illegal instruction is actually never executed. There is no microcode associated with illegal instructions. The e...
by ijor
Sat Nov 02, 2019 3:04 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 361
Views: 50725

Re: Work on the Minimig core?

So, my point was to do the filtering out at the single spot where the SR gets written rather than filtering it out for every instruction touching Status Register e.g. https://github.com/MiSTer-devel/Minimig-AGA_MiSTer/commit/cf481aa027db03e689b30c05f02c13060505ec10 That's ok. My comment was meant t...
by ijor
Sat Nov 02, 2019 12:47 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 361
Views: 50725

Re: Work on the Minimig core?

Would it be better to mask out the SR in a spot where it gets written after modification? Just below: "if exec(to_SR) = '1' then". That would also take care of move instruction. The unused SR bits, at least on the 68000, simply don't exist at the hardware. Then, IMHO, the correct way is a...
by ijor
Sat Oct 19, 2019 12:58 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 313
Views: 49338

Re: It's no more a MiSTery

It's not up to the CPU. It's actually up to the DMA chip itself depending on how many wait states it would produce on an access. But no, I don't think it would happen even in the worst case. Yes, but it's not really software-triggerable (I was just speculating if it would be possible to reset the D...
by ijor
Sat Oct 19, 2019 11:59 am
Forum: MiST
Topic: It's no more a MiSTery
Replies: 313
Views: 49338

Re: It's no more a MiSTery

Oh yeah, FCS_N is asserted at reset for this reason then. I wonder if it can be triggered in software. I think the CPU won't select the DMA chip for 16 cycles. It's not up to the CPU. It's actually up to the DMA chip itself depending on how many wait states it would produce on an access. But no, I ...
by ijor
Sat Oct 19, 2019 1:13 am
Forum: MiST
Topic: It's no more a MiSTery
Replies: 313
Views: 49338

Re: It's no more a MiSTery

But hardware debugging is a very tedious, time-consuming and hard job. No wonder why nobody ironing out the last bugs in cores. I think it is relatively easy as long as you can use a software emulator debugger to compare the traces :) It is several orders of magnitude harder when for some reason yo...

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