Search found 745 matches

by HardWareMan
Tue Sep 05, 2023 6:40 am
Forum: Hardware
Topic: FPGA version
Replies: 26
Views: 63834

Re: FPGA version

danibus wrote:
Mon Sep 04, 2023 5:21 pm
We had mega sg fpga but not sure if you can use their work.
I'll use only our decap project as source. I don't want to use any other one's.
by HardWareMan
Wed Aug 23, 2023 5:29 pm
Forum: Hardware
Topic: FPGA version
Replies: 26
Views: 63834

Re: FPGA version

Ok, our team almost done reverse engineering MD ASICs with it's decap. Some of team members was made a hardware level emulator and even FPGA one. Now my turn to finish this project. Finally I done with this: https://i.ibb.co.com/TYJFQ2P/IMG-1526.jpg This is Megadrive that rebuild on custom PCB with ...
by HardWareMan
Mon Aug 07, 2023 3:32 pm
Forum: Announcement
Topic: Nuked MD - decap-based cycle-accurate Mega Drive emulator (software & FPGA)
Replies: 8
Views: 56783

Re: Nuked MD - decap-based cycle-accurate Mega Drive emulator (software & FPGA)

Eke wrote:
Sun Aug 06, 2023 9:14 pm
That's impressive... and an unvaluable source of information. Thanks for your work :!:
Yeah, our team do the best. Now I am happy again.
by HardWareMan
Wed Jun 21, 2023 4:26 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2054271

Re: New Documentation: An authoritative reference on the YM2612

As I already said here we opened the MD decapping project. One of it branch is was YM2612/YM3438 FM chip. Now the new dedicated to FM chip project is started and almost die perfect verilog model is available here . Testbench: https://github.com/nukeykt/Nuked-OPN2-FPGA/raw/main/imgstore/testbench.jpg...
by HardWareMan
Tue May 23, 2023 6:40 pm
Forum: Hardware
Topic: 315-5339
Replies: 4
Views: 9806

Re: 315-5339

Image
by HardWareMan
Fri Apr 28, 2023 9:35 am
Forum: Megadrive/Genesis
Topic: M68K Bus Control and Vdp
Replies: 26
Views: 40943

Re: M68K Bus Control and Vdp

Okay. The decapping really confirmed the fact that the ZA[0] pin of arbiter 315-5364 is indeed a /UDS signal synchronized with the VCLK signal.
by HardWareMan
Mon Apr 17, 2023 5:33 pm
Forum: Hardware
Topic: Decapping more Genesis chips
Replies: 17
Views: 58630

Re: Decapping more Genesis chips

Okay. We open the GIT repository about SEGA chips for everyone. The link is: https://github.com/emu-russia/SEGAChips

Now you can help to the project if you want to. Or just use our datasets in yours projects. Welcome.
by HardWareMan
Fri Nov 18, 2022 6:41 am
Forum: Megadrive/Genesis
Topic: 10 MB Flat cart using discrete logic
Replies: 13
Views: 26185

Re: 10 MB Flat cart using discrete logic

You done it wrong. /ASEL is /CS for whole 8MB region. I'll just leave it here. https://i.ibb.co/YhqNCb8/SEGAMAP.png Also your 2NAND logic with /ASEL and /CE0 can burn your console because there must be 2OR logic. So, if you disconnect /CE0 and connect 13 pin to 12 you'll get the right result. Yes, /...
by HardWareMan
Thu Nov 17, 2022 5:05 pm
Forum: Megadrive/Genesis
Topic: 10 MB Flat cart using discrete logic
Replies: 13
Views: 26185

Re: 10 MB Flat cart using discrete logic

/AS didn't asserted when DMA does access. So yes, using /ASEL is a good idea.
by HardWareMan
Sat Mar 05, 2022 5:58 am
Forum: Hardware
Topic: Decapping more Genesis chips
Replies: 17
Views: 58630

Re: Decapping more Genesis chips

Hello again. Despite all the horror that is happening in the world, we continue the decapping project of Sega Megadrive/Genesis chips. Today I'll show you some quick previews at 10x magnifying level. 315-5364 https://i.imgur.com/3fUK6nn.jpeg TA-04 https://i.imgur.com/WMumyad.jpg 315-5309 https://i.i...
by HardWareMan
Mon Dec 27, 2021 2:42 pm
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 70
Views: 124224

Re: Cart Design Questions

Maybe you just out of the timing for SDRAM refresh?
by HardWareMan
Sat Dec 25, 2021 10:43 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 70
Views: 124224

Re: Cart Design Questions

You should use "~" (tilde) to inversion, not exclamation sign. Because "~" is fo bitwise negation (inversion) and "!" is for logical not.

Oh. You are confused between logical and bitwise operators (&& and & for example). Combinatorial logic uses bitwise only.
by HardWareMan
Wed Aug 25, 2021 10:56 am
Forum: Megadrive/Genesis
Topic: ( ) around absolute short addressing mode
Replies: 8
Views: 18693

Re: ( ) around absolute short addressing mode

Everyone should stick with official docs, specifically M68000 Family Programmer's Reference Manual. At the page 2-20 (61 in the PDF) there summary table of all available addressing modes.
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by HardWareMan
Mon Jan 06, 2020 12:50 pm
Forum: Hardware
Topic: Cartridge slot questions
Replies: 23
Views: 52971

Re: Cartridge slot questions

I suppose it would be nice to know what range the 32X outputs on the audio lines (though I heard reports that the 32X's output may be a bit too loud). It is the one piece of official hardware that makes use of it. Also the cartridges with YM2413 seem to use its output directly (?) so maybe looking ...
by HardWareMan
Mon Jan 06, 2020 4:55 am
Forum: Hardware
Topic: Cartridge slot questions
Replies: 23
Views: 52971

Re: Cartridge slot questions

That still doesn't tell me what voltage range you should use to keep the audio signal in a "reasonable" range (I'm not a Mega Drive circuit expert :v), only that it's mixed as-is with the rest of the audio (my initial guess would be that the ideal range would be ±1V but honestly I could be wildly w...