SpritesMind.Net

Sik wrote: Sun May 19, 2019 5:29 pm $A14xxx has the TMSS-related ports (on systems with TMSS, that is).

Systems without TMSS still don't assert !DTACK at those range.

TmEE co.(TM) wrote: Mon May 20, 2019 9:49 pm ...but seems only A15xxx range is used by SVP outside normal stuff.

Ok, then it will be A16000...BFFFFF without !DTACK to use more or less freely.

It is better to use !CAS2. When it asserts (goes to zero) there is sure stable address in any cycle, include DMA. The only problem with it is you've got shorter access time.

TmEE co.(TM) wrote: Sat May 18, 2019 7:39 pm It can only be used in ranges where VDP doesn't generate it for you such as 800000...9FFFFF. This area is used by 32X and SVP for example. You cannot forcibly override !DTACK since VDP actively drives it on most accesses.

There is also A14000...BFFFFF without !DTACK.

Also I think we should make cycle and logic accurate 68000 model for FPGA.

There's also a bit of a fondness for abbreviated variable and function names. Can anyone decipher what this means?
bool n2388 = !(s.clk || s.berro || s.n1361 || s.n2735 || s.n2772 || s.n2781);
Yeah, me neither.

This is just 6NOR logic with those 6 "signals" as boolean variables. I think this ...

We already discussed nIRQ frequency: http://gendev.spritesmind.net/forum/viewtopic.php?f=13&t=793&start=105#p31682
It's like a nIRQ not synced to any of signal. As I said before, this signal has 6,33ms period time slot. But it don't fire up at every slot (6,33ms), some slots a skipped (when drive ...

I'd would change it like this:

It looks like teletext scanlines.

I already showed you the Sonic logo from one of those chinese CoolBoy cartridges. Those people are always know about good places such this one and use any of identification marks as sign of "quality".

It your problem - "cheburashka" internet. =))
Glad to hear that from russian user, because the TS using local PSCD.RU internal forum upload folder for sharing with external internet. You should go futher and share with links from closed social network.
Anyway, you may continue your great plan.

It would be nice to know the geographical location too. It looks like this is some kind of regional service lock. Because I know, for example, that there are several Russian services not available outside of Russia.

(that thread was actually one of the first I think where VDP signals behavior was deeply studied, too bad most of the image links are broken now)
It's pity, yes. Feel free to ask me to recapture any of it (or any other) with any of this method: oscilloscope with up to 4 channels (up to 100MHz ...

So, you slow down the system by underclock the MCLK to make more clear capture?

Feel free to share some pictures.