Search found 3125 matches

by ijor
Tue Jul 28, 2020 1:59 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 6067

Re: GOEX for ST in the making

I still fail to understand your motivation. Would you please tell me why do you demand schematics to be released, exactly? I'm not " demanding ", of course. It was actually more a recommendation, not a demand. I know many users would not care, but others will. Certainly it is important for me and, ...
by ijor
Tue Jul 28, 2020 12:18 am
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 6067

Re: GOEX for ST in the making

...and can't run the original FF firmware... Of course it can and it does. Oh, I'm sorry if I was wrong. I apologize. But then I don't understand why you don't release schematics. What's the point? IMHO, you are only hurting your own customers. If the design is compatible with available sources, it...
by ijor
Mon Jul 27, 2020 1:51 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 6067

Re: GOEX for ST in the making

Hi, I do not plan to release schematics any time soon. Oh, I see. And I guess firmware sources aren't available either (I didn't realize before that the hardware is rather different and can't run the original FF firmware). Which means Goex is based on open source projects but it is actually closed ...
by ijor
Wed Jul 22, 2020 2:53 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3877

Re: Identify This Board?

There are a couple of thread at Atariage that mention some Programmers that can read the 8048:

https://atariage.com/forums/topic/25998 ... 835-modem/
by ijor
Wed Jul 22, 2020 2:40 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3877

Re: Identify This Board?

If the code is of interest to anyone (and assuming the MCU isn't code protected to prevent reading) I have the tools to desolder the chip from the board and a programmer that can read it. As far as I can see on the datasheet, this MCU doesn't have hardware protection to prevent you from reading the...
by ijor
Tue Jul 21, 2020 11:59 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3877

Re: Identify This Board?

Interesting. (Apparently) It is not exactly a floppy controller, but an internal adapter found on the some of the oldest ST models. Searching found some description here: https://groups.google.com/forum/?hl=en#!topic/comp.sys.atari.st/P-daqn1N6IQ The board has a microcontroller (Intel MCS-48) with i...
by ijor
Mon Jul 20, 2020 7:33 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 6067

Re: GOEX for ST in the making

Are the schematics available? (Hope mpattonm is still around to answer)
by ijor
Thu Jul 16, 2020 1:02 pm
Forum: Other emulators & tools
Topic: Writing Atari ST programs onto floppies with PC
Replies: 46
Views: 60226

Re: Writing Atari ST programs onto floppies with PC

I think the GW has a much bigger buffer (256k on my GW device, amd 2MB on the F7 devices) to help prevent underruns. Where did you get those numbers? :) No. The smaller GW based on the Blue Pill has 20K RAM only. The F7 one has 256K, I believe. And this is the total RAM, partly obviously used for o...
by ijor
Wed Jul 15, 2020 11:09 pm
Forum: Other emulators & tools
Topic: Writing Atari ST programs onto floppies with PC
Replies: 46
Views: 60226

Re: Writing Atari ST programs onto floppies with PC

The guys over at the Video Game Preservation Collective were talking about it. The various merits of the different devices. The SCP, Kryo and the Discferrit, and Applesauce. ... The Kryo is prone to buffer under runs it seems. The kryoflux is a streaming device. It doesn't have much internal ram an...
by ijor
Wed Jul 15, 2020 5:01 pm
Forum: Other emulators & tools
Topic: Writing Atari ST programs onto floppies with PC
Replies: 46
Views: 60226

Re: Writing Atari ST programs onto floppies with PC

You could always use something like a Greaseweazle, ... Obviously, you can use other flux tools but the GW is cheap and effective. And so far, it seems to be as good as, if not better than the existing flux kings (Supercard Pro and Kryoflux) In which ways Greaseweazle is, or you think it is, better...
by ijor
Wed Jul 08, 2020 12:34 am
Forum: Floppy Disk Preservation
Topic: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy
Replies: 17
Views: 1613

Re: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy

Track 46.1 and 49.1 are bad on this 520 STE pack of the game Indiana jones and the last crusade. I was right, this disk needs a bit of cleaning in order to make a good dump, and from there, an IPF or an HFE v3 file with protection intact for gotek drives. The good point is that the protection is co...
by ijor
Wed Jul 08, 2020 12:21 am
Forum: Floppy Disk Preservation
Topic: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy
Replies: 17
Views: 1613

Re: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy

OR, you can do the same to the image now! I added this ability with the last version of the software. You can load an image file and "rotate" the track and save that data back to the file. Once you are done rotating the tracks, the disk image would then be index aligned and would write correctly (y...
by ijor
Sat Jun 27, 2020 2:09 pm
Forum: Floppy Disk Preservation
Topic: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy
Replies: 17
Views: 1613

Re: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy

As I suspected, the disk wasn't formatted aligned to the index hole position and has data "under the index" on most tracks. As I said, I'm not sure those write back tools can deal with that. The SCP copy seems to be the best (should I say, less bad) because it seems you used a write back method that...
by ijor
Sat Jun 27, 2020 12:24 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

Sorry for abusing the edit function. I think editing shouldn't be allowed when it's not the last message in the thread. No need to apologize. Whas just a comment :) Allowing or not editing old messages is probably the most controversial topic in most forums. I believe there were some limitations he...
by ijor
Sat Jun 27, 2020 12:19 pm
Forum: Floppy Disk Preservation
Topic: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy
Replies: 17
Views: 1613

Re: 520STE Turbo Pack Disk 1 Indy cannot write back to floppy

Please dump and upload somewhere the non working disk(s). You didn't specify which tool you used to write back an with which method, and if you used the same drive, both for creating the dump and for writing back. The most common write back failure is something related to the index hole. If the disk...
by ijor
Thu Jun 25, 2020 4:26 am
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

Don't think so. Shifter can't latch on the CS leading edge. Data is not yet available. Just checked this in the sim, true, that cannot happen (CAS goes low at the same time as LOAD). Sorry, I wrote nonsense. LATCH asserted after CS goes down, so the data is not available. It is neither CAS neither ...
by ijor
Tue Jun 23, 2020 12:46 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

But do you know what should actually fail and what should not? E.g., I suspect the 4-bit syncsroll should fail in your model, and something is compensating and making it work. Possibly Closure in ST mode as well. Because if these "small" detail is not known fully, then I think it's better to make a...
by ijor
Tue Jun 23, 2020 4:06 am
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

Actually I would happily learn about other differences, but I didn't find any internal docs (only your reverse-engineered schematics). I'm not really expecting to have significant differences in the core logic, but probably in the register latching strobes or clock phases. There aren't any docs abo...
by ijor
Sun Jun 21, 2020 9:57 pm
Forum: Coding
Topic: Sync-tricks/fullscreen discussion
Replies: 120
Views: 57599

Re: Sync-tricks/fullscreen discussion

regarding vsync signal being asserted, does it set vblank too ? Yes, VSYNC sets VBLANK and also clears VDE. In that case where vblank is not set, does vsync forces vblank too to ensure nothing is displayed until next frame starts ? I'm not sure that was the original purpose. Although I have no way ...
by ijor
Sun Jun 21, 2020 9:39 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

As I'm not aware about the core logic differences - I cook from what I have. STe demos are working so far. I don't have the details, but I know they are different. Yes, I understand STe demos work, that's precisely the problem. If that's the main goal for you, then that is perfectly ok. But sometim...
by ijor
Sun Jun 21, 2020 8:19 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80887

Re: It's no more a MiSTery

With some help from Troed, Closure finally works in ST mode! https://github.com/mist-devel/mist-binaries/blob/master/cores/mistery/MiSTery-200621.rbf I hope this is really true now: https://www.atari-forum.com/viewtopic.php?p=379700#p379700 Great job, as usual, slingshot. But I suspect something is...
by ijor
Fri Jun 19, 2020 4:28 pm
Forum: Demos - General
Topic: STE Blitter
Replies: 19
Views: 2307

Re: STE Blitter

does that mean CPU/BLiTTER split 64 / 64? /* Non HOG DMA cycle counter. Counts 64 bus cycles (any bus cycles). BLITTER Buglet: Starts counting as soon as BUSY is set. the outcome from my tests on the real STe is that split is isn't stiff. CPU part can takes more bus cycles than 64 and the BLiTTER t...
by ijor
Thu Jun 18, 2020 3:09 am
Forum: Demos - General
Topic: STE Blitter
Replies: 19
Views: 2307

Re: STE Blitter

leonard wrote: Wed Jun 17, 2020 9:48 pm Good to see you too! I'm doing fine. What about your FPGA atari core?
You can read the Blitter source here if you are interested: https://github.com/ijor/stBlitter
by ijor
Wed Jun 17, 2020 8:07 pm
Forum: Demos - General
Topic: STE Blitter
Replies: 19
Views: 2307

Re: STE Blitter

Hi Leonard Good to see! How are you doing? I don't know, you can clear, you can "or" buffers quite fast. As a rule of thumb, blitter is doing exactly what CPU could do, but without the cost of CPU instruction decoding. ( so it's like if you have a instruction cache and CPU instructions are free). Fo...
by ijor
Wed Apr 15, 2020 2:03 am
Forum: Coding
Topic: Blitter Execution Times
Replies: 43
Views: 6727

Re: Blitter Execution Times

@ijor did you decap the BLiTTER or analyse an documentation? I wonder if there is something what was planned and not implemented or partially implemented. I didn't decap Blitter. I analyzed the original schematics that Christian recovered from the Atari archive. I also performed tests on real hardw...

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