Search found 2203 matches

by ijor
Sat Oct 21, 2017 4:18 am
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 39
Views: 1339

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

Seems there are all sort of issues. These "amateurish" protections are always the most complicated for emulation. I can't perform a full analysis at this time, so just some comments ... It sounds like there are both emulation issues and write back problems as well. Not necessarily strictly...
by ijor
Wed Oct 18, 2017 9:17 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 39
Views: 1339

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

Only some STX images will work as HFE, which has no bit density information, it's not conclusive. Are you sure of this ? I though variable bit rate was recently added to HFE format V3, as discussed here : http://torlus.com/floppy/forum/viewtopic.php?f=33&t=1613&start=15 There are multiple t...
by ijor
Mon Oct 16, 2017 3:40 am
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 25
Views: 840

Re: STFM to DVI/HDMI project

... and 50Hz operation is guaranteed in the HDMI spec (not for DVI though). Are you sure? Where do you see that in the specs? In the specs I have (not the latest that are not public) I don't see that. I do see some modes at 50Hz listed in the specs. But if I read the specs correctly, those modes ar...
by ijor
Mon Oct 16, 2017 1:56 am
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 25
Views: 840

Re: STFM to DVI/HDMI project

This is at heart a scan doubler ... The FPGA is running on a 32MHz clock like the original shifter, and all video modes will use the 32MHz pixel clock with a 10x PLL. My question had to do with the frequency of the HDMI connection. Some people claim that some TVs/monitors are very picky and expect ...
by ijor
Sun Oct 15, 2017 5:24 pm
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 25
Views: 840

Re: STFM to DVI/HDMI project

Cool indeed!

Mostly out of curiosity, can you share some technicals? Are you just scan doubling, adapting the clock to match the nominal HDMI frequency, or implementing a full frame buffer?
by ijor
Mon Oct 09, 2017 10:40 am
Forum: 680x0
Topic: Rasters
Replies: 40
Views: 8776

Re: Rasters

Steven Seagal wrote:Is there such a delay for other instructions updating SR?


The delay should be the same for all instructions that update the SR. But STOP is the only one that doesn't prefetch after the update. That means that the others have several more cycles between the update and the end of the instruction.
by ijor
Sun Oct 08, 2017 2:06 pm
Forum: Hardware
Topic: MMU schematics WIP
Replies: 48
Views: 5587

Re: MMU schematics WIP

Yes, I wasn't complete. In my vision (as in Troed's efforts for the Glue), we had something like that: Glue: IF (POSITION==X) && (FREQUENCY==60) THEN DE.H = TRUE MMU: IF (DE) THEN SHIFTER_LOAD(&VIDEO_MEMORY) VIDEO_MEMORY+=2; As I said, functionally the concept is correct. But if this at...
by ijor
Sun Oct 08, 2017 1:51 pm
Forum: 680x0
Topic: Rasters
Replies: 40
Views: 8776

Re: Rasters

A new insight we took from WinUAE is that STOP won't unstop before 8 cycles, apparently based on hardware tests. In that specific case, that's something that came from Hatari and that I reported to Toni. And it was already known and measurable on ST in fact : if you do a "STOP #2100" whil...
by ijor
Sun Oct 08, 2017 4:59 am
Forum: Hardware
Topic: MMU schematics WIP
Replies: 48
Views: 5587

Re: MMU schematics WIP

Well, I was thinking of a model where GLUE sets DE true, when the MMU sees that signal, it starts reading video memory, now we can't do that that way. Functionally that is correct. When GLUE asserts DE, MMU starts the video process. But because of the internal delays, the timing as seen by the CPU ...
by ijor
Sat Oct 07, 2017 7:59 pm
Forum: Hardware
Topic: MMU schematics WIP
Replies: 48
Views: 5587

Re: MMU schematics WIP

So what you're saying is that the DE signal we see on traces is changed some 4 cycles after the 'decision'. That's a complication for the model. I don't remember if it's 4 cycles, I would need to check. It was just an example to illustrate that there is a delay. But I'm not sure you should care. Fo...
by ijor
Sat Oct 07, 2017 3:44 am
Forum: Hardware
Topic: MMU schematics WIP
Replies: 48
Views: 5587

Re: MMU schematics WIP

Does the MMU fetch video memory and present it to the Shifter in one go? If a read from memory takes 2 cycles, does LOAD happen on the 3rd cycle? MMU doesn't fetch any RAM at all. It controls RAM but can't actually read from RAM because it is not connected to the RAM data bus. MMU just setups a RAM...
by ijor
Fri Oct 06, 2017 12:51 pm
Forum: For sale / Wanted
Topic: Scam user warning
Replies: 6
Views: 322

Re: Scam user warning

I live at Argentina. I can't comment on this specific case, it wouldn't be fair, but ... We do have an unreliable mailing service, and we do also have a very problematic customs systems. HOWEVER , this is no excuse for not paying and certainly not for bad manners. On the contrary ... Exactly because...
by ijor
Sun Oct 01, 2017 1:59 pm
Forum: Website Discussions
Topic: Atari Legend is back!
Replies: 37
Views: 1704

Re: Atari Legend is back!

Great news !!!
by ijor
Sat Sep 30, 2017 3:27 pm
Forum: Pasti & VAPI
Topic: New version of Pasti.DLL: 0.3a
Replies: 8
Views: 1419

Re: New version of Pasti.DLL: 0.3a

Version 0.3a2, with the bug fixed, is posted in the first message of this thread.
by ijor
Fri Sep 29, 2017 12:54 pm
Forum: Pasti & VAPI
Topic: New version of Pasti.DLL: 0.3a
Replies: 8
Views: 1419

Re: New version of Pasti.DLL: 0.3a

AtariZoll wrote:Race Drivin' disk 2 (what is game, first is intro only) crashes soon after boot, with Pasti 0.3a .


I can confirm the bug, will fix it soon, thanks for the report. It's a bug introduced in this (0.3a) version. Should run ok with previous versions.
by ijor
Thu Sep 28, 2017 1:25 pm
Forum: Coding
Topic: ST Chipset decap
Replies: 84
Views: 16544

Re: ST Chipset decap

But sill the flow of pixels is uninterrupted, so during RELOAD, bits are shifted too? That's what I mean by 'right after'. The current bit is shifted out and it is replaced with either a shifted in bit or a reloaded bit. During reload no shifting occurs inside the shift array. Of course, the shift ...
by ijor
Thu Sep 28, 2017 11:36 am
Forum: Coding
Topic: ST Chipset decap
Replies: 84
Views: 16544

Re: ST Chipset decap

- The shift array you described is complete. There are 4 rows of 16 cells, not double that. - Each cell contains two bits, a bit that comes from Din and is pushed "down" the cells, and a bit that comes from ShIn and is shifted through ShOut. - There's no real transfer IR->RR as between se...
by ijor
Wed Sep 27, 2017 1:46 am
Forum: Coding
Topic: ST Chipset decap
Replies: 84
Views: 16544

Re: ST Chipset decap

Steven Seagal wrote: ... but I was wondering if a short copy delay could be visible on the screen, marking each raster, in monochrome for example.


There is nothing like that.
by ijor
Tue Sep 26, 2017 8:54 pm
Forum: Coding
Topic: ST Chipset decap
Replies: 84
Views: 16544

Re: ST Chipset decap

I was afraid the 2 words shift wasn't caused by the 'right off' trick. Well, any shifter trick (overscan, sync, etc) that leaves two words, or just any words, in the shifter would have the same effect. 1. Are IR and RR always the same registers with a copy IR->RR every 16 cycles, or are those regis...
by ijor
Mon Sep 25, 2017 3:07 am
Forum: Coding
Topic: ST Chipset decap
Replies: 84
Views: 16544

Re: ST Chipset decap

Hi Steven, 1. When 4 words have been loaded but no RELOAD happened, because the pixel counter<16, and the MMU asserts LOAD again, what does the Shifter do? Does it load the new word, shifting previous words and losing the first word? Yes, the IR registers (as named in the Alien model) can be describ...
by ijor
Thu Sep 21, 2017 9:13 pm
Forum: MiSTer
Topic: MiSTer for Dummies
Replies: 20
Views: 1478

Re: MiSTer for Dummies

Why that response, when surely a faster FPGA should mean more powerful cores. If I wanted to emulate an ST or Amiga I'd just buy the mist. The only possible future prospect for Mister is the ability to emulate a higher performance atari machine as far as I can see. The FPGA in the MiSTer has much m...
by ijor
Wed Sep 20, 2017 12:43 pm
Forum: Games - Requests
Topic: Alien world 1 x original disk - download anywhere?
Replies: 36
Views: 2134

Re: Alien world 1 x original disk - download anywhere?

I have an STX file from the original i bought, as well as an IPF out of the game. The ST version use a 5x1024bytes sectors format, and is spread on 79 tracks. It matches the dump that was at Atarimania. So again, I think it should be restored because if something is missing is not in the dump but i...
by ijor
Sun Sep 17, 2017 1:24 am
Forum: SuperCard Pro Disk Copier
Topic: Gunship problem
Replies: 19
Views: 1823

Re: Gunship problem

I don't think it is a problem of the drive. I suspect it is a problem of the SCPro software that is not detecting the write splice correctly. May be worth to check with Jim. Just in case, are you using the latest SCPro software/firmware?
by ijor
Mon Sep 11, 2017 3:23 am
Forum: SuperCard Pro Disk Copier
Topic: Gunship problem
Replies: 19
Views: 1823

Re: Gunship problem

Definitely a problem with sectors under the index. I can't say for sure if you are using the wrong parameters or it's a bug in the SCP software. As I said, I don't own a SCP and I am not very familiar with it. But try changing the "Copy Mode' when writing back. This should be required for disks...
by ijor
Sat Sep 09, 2017 6:37 pm
Forum: SuperCard Pro Disk Copier
Topic: Gunship problem
Replies: 19
Views: 1823

Re: Gunship problem

Did a search in the forum about Gunship and found out DrCoolZic says that Gunship can't written back to disk. No. You are misinterpreting what he is saying and that's not the problem you are facing. Some versions of Gunship have a problem if you write an individual sector , such as when writing the...

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