Search found 2467 matches

by ijor
Sat Jan 27, 2018 6:52 pm
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 29045

Re: BAD DMA - Myth or fact ?

Sorry, had to check which STE had the chip. Have just dug out the STE, created the War Heli disk from the SCP image and booted it up. I have only played the first level and it works fine with the new CPU. :D Many thanks. If it was the original copy protected version of War Heli, then my guess is th...
by ijor
Sat Jan 27, 2018 6:49 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 164
Views: 14409

Re: How does the Amiga MiSTer Core compare to the MiST?

There is no point to talk about FPGA usage in other area. Different tasks have different limitations. We are talking about retro emulation. I just tell that clock propagation in FPGA is not like a single wire through whole core. Fitter inserts many fixes of clock propagation delay. Sometimes it add...
by ijor
Fri Jan 26, 2018 8:25 pm
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 29045

Re: BAD DMA - Myth or fact ?

kodak80 wrote:Yes, I still have the STE which I swapped the CPU. I would be happy to do some more testing to help confirm if the CMOS chip is not 100% compatible. I have an SCP and KF flux board and can duplicate most disks if you have the images.


Bump ... Just curious, were you able to run any test?
by ijor
Fri Jan 26, 2018 8:23 pm
Forum: MiSTer
Topic: Minimig (Amiga) core discussion
Replies: 164
Views: 14409

Re: How does the Amiga MiSTer Core compare to the MiST?

But as for raw performance of FPGA fabric - it's the same, moreover Cyclone V has lower max operational frequencies than Cyclone III. So Minimig core in current state will be almost the same or slightly slower in performance (slightly above stock A1200 in my case). I don't think the MiST has a fast...
by ijor
Mon Jan 22, 2018 9:08 pm
Forum: News & Announcements
Topic: What hapened to atariforge? dev-docs moved.
Replies: 52
Views: 6422

Re: What hapened to atariforge? dev-docs moved.

Come on people, let it go ...
by ijor
Sun Jan 21, 2018 2:45 pm
Forum: News & Announcements
Topic: What hapened to atariforge? dev-docs moved.
Replies: 52
Views: 6422

Re: What hapened to atariforge? dev-docs moved.

Let's not take things out of proportions, please.

I agree that authorization should be asked for mirroring, and certainly credit should be given. But no need to call it names.
by ijor
Sun Jan 21, 2018 1:07 pm
Forum: MiST
Topic: The last MIST
Replies: 107
Views: 13709

Re: The last MIST

Wow, it makes me very sad.

Thank you and congratulations, Till. You did a wonderful job. There might be other similar products cheaper, more advanced, and perhaps even better. But it is far easier to improve upon a design or idea. You showed the way.
by ijor
Thu Jan 18, 2018 3:56 am
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 29045

Re: BAD DMA - Myth or fact ?

Yes, I still have the STE which I swapped the CPU. I would be happy to do some more testing to help confirm if the CMOS chip is not 100% compatible. I have an SCP and KF flux board and can duplicate most disks if you have the images. SCP image of War Heli should be on retrobackup.com according to t...
by ijor
Thu Jan 18, 2018 1:29 am
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 29045

Re: BAD DMA - Myth or fact ?

Out of curiosity: can you provide more details -- or a link? I was also thinking of replacing the CPU in my STE by a 68HC000. If I do so, I would know what to look for... I don't have much details. It is just a hunch. Most 68000 undocumented issues are by design, or otherwise they are an obvious re...
by ijor
Wed Jan 17, 2018 6:59 pm
Forum: Hardware
Topic: BAD DMA - Myth or fact ?
Replies: 97
Views: 29045

Re: BAD DMA - Myth or fact ?

Just an update from me. I have an STE which was corrupting the files on my Satandisk when I copied files to the drive from floppy. I have finally replaced the CPU with a MC68HC000FN8 and have just sucessfully copied a large amount of files around without seeing the corruption occur. :D Btw, do you ...
by ijor
Sat Jan 13, 2018 11:09 pm
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

It WORKS. It does seem as if I need to time it to actual RESET very accurately though. I'm not sure why? Congratulations Ijor - yet another feather in your hat! :D On one single power cycle and three RESETs I've gone through WS1, WS3, WS3 and WS4. :) :) So glad it works. Jaja Not sure why you need ...
by ijor
Fri Jan 12, 2018 12:47 pm
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 78
Views: 7300

Re: STFM to DVI/HDMI project

Haha, Quartus has about three trillion buttons I've never clicked on... :wink: I see :) You'll soon learn that the more internal RAM available you have, the more useful SignalTap is. I realize it is not easy to replace the FPGA, but it is recommended to debug with a larger FPGA so that you have lot...
by ijor
Fri Jan 12, 2018 12:40 pm
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 78
Views: 7300

Re: STFM to DVI/HDMI project

Yeah it does sound strange. However, while the Mega ST schematics are from 1986, you can find the part number also in the Mega STE service manual from 1991: U17 C025914 IC CUSTOM SHIFTER U31 or C101608 IC CUSTOM FULL SHIFTER (w/D/A) U31 STF (Non STE) parts on Mega STE service manual ??? Where do yo...
by ijor
Fri Jan 12, 2018 10:58 am
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 78
Views: 7300

Re: STFM to DVI/HDMI project

Spectrum 512 works well now and also an overscan test program that Troed sent to me that displays a static image with all borders extended. Nice :) I haven't got a LA, just a 2-channel 'scope. Moving demos are hard to follow. I guess you know that the FPGA has some sort of integrated LA (SignalTap)...
by ijor
Fri Jan 12, 2018 12:41 am
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 78
Views: 7300

Re: STFM to DVI/HDMI project

Smonson wrote:But right now, I want to finish this project before moving on to another one. Maybe someone else will do it first :)


So how is this project going, Smonson? Any news? :)

Did you try what I recommended? Enhancing/fixing the simple model that should work with almost all overscan programs?
by ijor
Fri Jan 12, 2018 12:38 am
Forum: Hardware
Topic: STFM to DVI/HDMI project
Replies: 78
Views: 7300

Re: STFM to DVI/HDMI project

Apparently there are three different Shifters, with slightly different motherboards, looking at the Mega ST schematics at least. One of the Shifter models does not output 3 bits RGB each, but has an internal version of the resistor grid and outputs the analog R,G,B signals directly. C101608 would b...
by ijor
Tue Jan 09, 2018 12:15 am
Forum: The Atari 8bit corner
Topic: If then else bypass
Replies: 11
Views: 1719

Re: If then else bypass

MrPixel wrote:i will try that now. thank you. also, is there a way to save created games to .Tap or cart? i'm using WinAtari800Plus


You can save Basic programs to tape or to disk, if that's what you mean, but not to easy to cart. Btw, Atari800WinPlus is very outdated. I'd recommend switching to Altirra.
by ijor
Tue Jan 09, 2018 12:13 am
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

the LOAD pulses are 5 32MHz clock cycles in this trace. Unless that's strange since they come from 16MHz MMU ... That's correct. It is 2 and a half cycles on the OLD MMU versions. It combines the output of two flip flops working at the opposite edge of the clock to get half cycle resolution. Btw, t...
by ijor
Mon Jan 08, 2018 6:35 pm
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

Well the B2 trace is of the output blue bit 2 so any Shifter wakeup should be visible there? (Come to think of it, maybe I should see if I can clock the LA at 32MHz while still accurately detecting the other signals) You might get an estimate. But without comparing with the output at med rez, is no...
by ijor
Mon Jan 08, 2018 5:56 pm
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

Interesting. Looking at the PIN schematics at https://www.exxoshost.co.uk/forum/viewtopic.php?f=31&t=149 the pin between /SNDCS and /MFPCS is named GND on the DIP version and TEST on SMD :) However, looking at the Mega ST schematic pin 52 is indeed marked as "TEST", and wired to GND. ...
by ijor
Mon Jan 08, 2018 5:04 pm
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

Attached are full frames of a regular low resolution screen in WS1, WS2 and WS3. Just great. Many thanks :) (I really need to build that automatic circuit that will power cycle until a set WS .. ). Well, as I commented some time ago in other thread, it is possible (at least in theory) to build a sm...
by ijor
Mon Jan 08, 2018 12:26 am
Forum: Hardware
Topic: LA traces on interesting video signals
Replies: 27
Views: 1876

Re: LA traces on interesting video signals

Anyway, for the cases where only relation to CPU clock is of interest I've now managed to clock my LA from the CPU clock, which means I can stream all other signals at 50MHz and capture as many frames as I want. Sync capture is great. But if you can and you still get one full frame, try using the 1...
by ijor
Sun Jan 07, 2018 7:37 pm
Forum: MiSTer
Topic: SDRAM+SRAM board (only concept for now)
Replies: 12
Views: 1147

Re: SDRAM+SRAM board (only concept for now)

65MHz*3 = 195MHz.. Haha, better than Async SRAM ))))) It's 3 cycles only for the standard pipelined version, and only when switching bus direction. The flow through version has two cycles latency. And the NoBT/ZBT parts work at two cycles pipelined or single cycle flow through same as Async. Flow t...
by ijor
Sun Jan 07, 2018 7:22 pm
Forum: MiSTer
Topic: MISTer on DE0-nano-SoCKit?
Replies: 90
Views: 7538

Re: MISTer on DE0-nano-SoCKit?

Out of curiosity - could you please describe (or point me to some tutorial) how to calculate PLL phase shifts and so one. Tried to go through altera tutorials on TimeQuest - didn't find any practical benefit yet. Just calculate the center of the waveform's eye: - Compile the core without any PLL sh...
by ijor
Sun Jan 07, 2018 1:23 pm
Forum: MiSTer
Topic: SDRAM+SRAM board (only concept for now)
Replies: 12
Views: 1147

Re: SDRAM+SRAM board (only concept for now)

Sorgelig wrote:Good luck to find SSRAM in TSOP or similar soldering iron friendly package and make it run at 200MHz on MiSTer module ;)


200 MHz perhaps not, but technically there is no reason why it shouldn't run, at least, as fast as SDRAM.

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