Search found 2113 matches

by ijor
Fri Jun 23, 2017 8:03 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 22
Views: 832

Re: MiSTer: MiST on Terasic DE10-nano board.

If you don't want/need it, then simply pass. Or create other project which will have better specs and will retain binary compatibility - i will see how you will do it ;) Man, you lately seem to be take things too personally and react aggressively. I have nothing to say against your project. I prais...
by ijor
Fri Jun 23, 2017 6:13 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 22
Views: 832

Re: MiSTer: MiST on Terasic DE10-nano board.

Sorgelig wrote:The main relation to MiST is firmware and API.


I realize, but this is not much related to the hardware. You can have a compatible firmware in a completely different board, even using a Xilinx FPGA.
by ijor
Fri Jun 23, 2017 12:29 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 22
Views: 832

Re: MiSTer: MiST on Terasic DE10-nano board.

Great work. I always thought that using one of these board (plus some addons) is much better than building hardware from scratch. No way we could compete with their prices.

But what's the relation with the Mist??? Cores binaries aren't compatible.
by ijor
Mon Jun 12, 2017 12:49 am
Forum: Hardware
Topic: copying protected floppies -> floppy destruction?
Replies: 10
Views: 562

Re: copying protected floppies -> floppy destruction?

Only now, after a few decades, some floppies are physically so weak that reading it too many times could destroy it. This happens quite a lot with some 8-bit 5.25 disks. But in such cases the disk is already too fragile and even could be destroyed under normal usage. My personal view related to my ...
by ijor
Sun Jun 11, 2017 2:51 am
Forum: Hardware
Topic: Using Epson SD-600 5.25 drive as Drive A - jumper settings ?
Replies: 5
Views: 232

Re: Using Epson SD-600 5.25 drive as Drive A - jumper settings ?

Is that an HD (80 tracks) drive? Can't find an official manual or datasheet online. With the drive turned off move the head inwards. Boot and see if the head moves outwards as much as possible. If it doesn't, then the ST won't "see" it and it will assume there is no drive. Jumpers other th...
by ijor
Sun Jun 11, 2017 2:31 am
Forum: Hardware
Topic: copying protected floppies -> floppy destruction?
Replies: 10
Views: 562

Re: copying protected floppies -> floppy destruction?

More than an urban myth it is actually a blatant lie that some publishers wanted you to believe. Only now, after a few decades, some floppies are physically so weak that reading it too many times could destroy it. This happens quite a lot with some 8-bit 5.25 disks. But in such cases the disk is alr...
by ijor
Sun Jun 04, 2017 9:03 pm
Forum: Demos - General
Topic: Best fullscreen screen.
Replies: 83
Views: 39118

Re: Best fullscreen screen.

troed wrote:... so, I would consider my speculation to have been quite on point ;)


As usual ... :)
by ijor
Fri Jun 02, 2017 6:06 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

I am not very familar with Paulo's test program. But did you try changing the unstabilizer with ESC?

As I understand, if you always get the same behavior under the same GLUE wakestate, it should mean that you are also getting always the same SHIFTER wakestate.
by ijor
Wed May 31, 2017 5:59 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

In my other 1040STF, yes. That machine incidentally shows no glitches with the demo. However, I think you mean putting only the -38 Shifter into my 1040STFm with IMP chipset, right? That's a bigger task, I'll see if/when I can do it. Yes, I was interested to see what happens with the -38 Shifter on...
by ijor
Wed May 31, 2017 5:55 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

This sounds like exactly it. Paulo's investigation into this phenomenon resulted in the ability to create such pixels of weird colors depending on bus content. See here: http://www.atari-forum.com/viewtopic.php?f=16&t=24855&start=300#p237129 I'm not completely sure if it's the external bus ...
by ijor
Wed May 31, 2017 4:57 am
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

There is also mix of asynchronous latches and dynamic synchronous flip flops here. Might be this has something to do with the issue. Thinking ... this might indeed be the problem . The palette registers are asynchronous transparent latches. This means that the output changes as soon as latching (wr...
by ijor
Wed May 31, 2017 1:11 am
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

What I can add is that the glitches I observe in the demo mentioned above with the IMP Shifter are very reproducible. It's not like they only happen every N power cycles or like they get better or worse during the run time of the STfm. Basically they're always there and always look the same. Do you...
by ijor
Wed May 31, 2017 1:08 am
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

But this is of course an area where you might sit on info no one else has :) How is the palette lookup done per shifting of bit onto the RGB pins? Well, to be honest, I'm not sure how this could create bus contention, or a black pixel. Palette lookup is rather simple and straightforward. The output...
by ijor
Wed May 31, 2017 12:56 am
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

GLUE, which can be offset 0-3 cycles from MMU, raises DE. That signal goes to the MMU and to the Shifter. The Shifter will see it immediately, disregarding the wakestate offset the MMU has. This means that DE raised will be desynced between what the MMU does (LOAD) and what the Shifter does (start ...
by ijor
Tue May 30, 2017 2:28 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

The delay between HSYNC and DE differs with 0-3 cycles in the different wakestates. This means pixels will physically be offset 0-3 pixels on screen depending on wakestate. You mean the delay between DE and LOAD (or between HSYNC and LOAD), I guess, and not between DE and HSYNC because this is whol...
by ijor
Tue May 30, 2017 1:51 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

However, the physical placement of pixels on screen is indeed one of the differences between GLUE-MMU wakestates, and when you start mixing that with palette changes you can get some interesting problems. Are you talking about "simple Spec512" effects? Or combined with sync/full screen ef...
by ijor
Tue May 30, 2017 11:57 am
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 30
Views: 1794

Re: IMP Shifter - Interesting detail

IMP chips tend to be faster than previous generations. IMP chips are Full Custom/Standard Cell, while older ones are Gate Arrays, and being a few years later, they likely were fabbed in a smaller and faster CMOS process. Probably the problem is similar as when you mix old school with modern tech. Mo...
by ijor
Sun May 28, 2017 1:45 am
Forum: ST(E) Clones (Suska / MiST)
Topic: Porting Cores and More
Replies: 5
Views: 808

Re: Porting Cores and More

Well with NT Mini's FPGA being 2 generations ahead of the MIST and ... it looks like a no go. It doesn't work like that. That would be true for high end FPGA devices. But we don't use high end ones, they are too expensive for our purposes. We use devices from the low end family (Cyclone in this cas...
by ijor
Thu May 25, 2017 7:04 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: ST Mini (Mist Clone)
Replies: 28
Views: 2540

Re: ST Mini (Mist Clone)

It doesn't seem to have any of the debug ports. Most people probably will not care, but for me and for many developers I guess, it's a big minus.
by ijor
Thu May 25, 2017 2:17 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: ST Mini (Mist Clone)
Replies: 28
Views: 2540

Re: ST Mini (Mist Clone)

Interesting. But that's the idea of open source. Anybody can clone the Mist hardware and use the Mist firmware and cores. Note that board files are not available and not published, only schematics. So some work is needed, but nothing really terrible. Will this make Till (Mist developer) and Lotharek...
by ijor
Thu May 25, 2017 2:09 pm
Forum: Hardware
Topic: Discovery cartridge modifications/questions
Replies: 13
Views: 722

Re: Discovery cartridge modifications/questions

The thing really isn't that you can add Mac roms to the Discovery cartridge, it's that Discovery apparantly work just as a spectre cartridge when it comes to getting the ST reading/writing Mac formatted disks... ie, atleast to some extent, the spectre has the same abilities as the discovery cartrid...
by ijor
Wed May 24, 2017 9:13 pm
Forum: Games - Requests
Topic: Iron Lord
Replies: 8
Views: 1187

Re: Iron Lord

Thanks Brume. dlfrsilver's french dump has a couple of problems. It is almost identical to Brume's dump except just a handful of bytes. But it has one sector damaged. In addition, something seems wrong with the drive used to produce the dump. It's not "aligned" correctly. If running the or...
by ijor
Wed May 24, 2017 2:36 am
Forum: Games - Requests
Topic: Iron Lord
Replies: 8
Views: 1187

Re: Iron Lord

If all the protection is in track 48 in disk 1, then it is very simple and could be copied with software copiers. It is the same in both english and french versions, and it's completely different to his protections on the other Ubisoft titles. @dlfrsilver: something is a bit odd with the track 48 on...
by ijor
Wed May 24, 2017 1:12 am
Forum: Hardware
Topic: Discovery cartridge modifications/questions
Replies: 13
Views: 722

Re: Discovery cartridge modifications/questions

I'm afraid this isn't exactly my area of expertise. I can tell you almost everything about the floppy functionality of the DC, but I never owned one with the optional components and I'm really not much familiar with them. As far as I can tell, the complexity of the second cartridge arises from the p...

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