Search found 726 matches

by HardWareMan
Tue Jun 04, 2019 10:29 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 40
Views: 4615

Re: Cart Design Questions

In terms on the devices I have on board, they are with their estimated power consumption: 1x SAM4S (30mA @ 3.3V) (50mA startup current needed) 1x Intel Max V CPLD (VCCIO 10mA @ 3.3V (40mA startup current), VCCINT ~10mA @ 1.8V) 1x EEPROM @ 50mA So in all, the load on the regulator for 5V->3.3V is 50...
by HardWareMan
Thu May 30, 2019 5:30 am
Forum: Demos
Topic: Misplaced
Replies: 1
Views: 192

Misplaced

Recently I found the new game for MD/Genesis: Misplaced https://img.itch.zone/aW1hZ2UvNDI4OTA3LzIxNDQzNzQucG5n/347x500/DL9Xjh.png My name is Hara... Every day I start in the same way, I wake up on a small strange island that hovers somewhere in the clouds. And today one of these identical days... We...
by HardWareMan
Mon May 27, 2019 2:13 pm
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 40
Views: 4615

Re: Cart Design Questions

You guys mentioned earlier that /AS is not asserted for DMA, and that /CAS2 is asserted for DMA. But do you guys know if /CAS0 is also asserted for DMA? If /CAS0 is asserted for all accesses (68k, Z80 and VDP), then I can get the CPLD to listen using /CEO and /CAS0 and therefore have more time to g...
by HardWareMan
Tue May 21, 2019 7:09 am
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 55
Views: 3097

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

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.
by HardWareMan
Sun May 19, 2019 5:05 pm
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 40
Views: 4615

Re: Cart Design Questions

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.
by HardWareMan
Sun May 19, 2019 5:00 pm
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 55
Views: 3097

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

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.
by HardWareMan
Sat May 11, 2019 5:11 am
Forum: Megadrive/Genesis
Topic: I'm officially building a microcode-level 68000 core
Replies: 41
Views: 2914

Re: I'm officially building a microcode-level 68000 core

Also I think we should make cycle and logic accurate 68000 model for FPGA.
by HardWareMan
Mon May 06, 2019 5:27 am
Forum: Megadrive/Genesis
Topic: I'm officially building a microcode-level 68000 core
Replies: 41
Views: 2914

Re: I'm officially building a microcode-level 68000 core

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 is cam...
by HardWareMan
Tue Apr 30, 2019 5:47 pm
Forum: Mega/SegaCD
Topic: Questions on writing a new Mega CD emulator
Replies: 112
Views: 5010

Re: Questions on writing a new Mega CD emulator

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 co...
by HardWareMan
Fri Apr 05, 2019 7:10 pm
Forum: Cartridge
Topic: EEPROM mapping for homebrew
Replies: 9
Views: 824

Re: EEPROM mapping for homebrew

I'd would change it like this:
Image
by HardWareMan
Wed Apr 03, 2019 2:36 pm
Forum: MegaLD
Topic: MegaLD Dumping Project
Replies: 73
Views: 35700

Re: MegaLD Dumping Project

It looks like teletext scanlines.
by HardWareMan
Thu Nov 15, 2018 5:00 am
Forum: Blabla
Topic: aliexpress genesis with same logo as spritesmind
Replies: 5
Views: 1197

Re: aliexpress genesis with same logo as spritesmind

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".
by HardWareMan
Sat Oct 20, 2018 11:33 am
Forum: Demos
Topic: Game similar to Resident Evil
Replies: 21
Views: 4380

Re: Game similar to Resident Evil

SegaTim wrote:
Fri Oct 19, 2018 10:35 pm
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.
by HardWareMan
Fri Oct 19, 2018 7:05 am
Forum: Demos
Topic: Game similar to Resident Evil
Replies: 21
Views: 4380

Re: Game similar to Resident Evil

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.
by HardWareMan
Thu Oct 18, 2018 10:18 am
Forum: Demos
Topic: Game similar to Resident Evil
Replies: 21
Views: 4380

Re: Game similar to Resident Evil

Image