Search found 700 matches

by HardWareMan
Tue Apr 11, 2017 10:15 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 5307

Re: MD hangs after playing any PCM file

Jorge Nuno wrote:HardWareMan VDP pin 118 :wink:
Oh, you're right. My bad.
by HardWareMan
Tue Apr 11, 2017 1:47 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 5307

Re: MD hangs after playing any PCM file

Well I see the pin is CAS0 on the VDP, but on cart and expansion slot diagrams around the place it seems to be listed as OE. Maybe I'll randomly switch between the two and everyone will have to guess what I'm on about. Here, I'll put it closer to you. http://savepic.ru/13550680m.gif http://savepic....
by HardWareMan
Sun Apr 09, 2017 6:17 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 5307

Re: MD hangs after playing any PCM file

Yes, it is bus metastability. Since M68K itself can't do that after AS asserting (@design), so this is chipset related problem. Oh, deja vu, is we already discussed it before? Anyway, yes, there is a problem. Since SRAM or ROM can handle with this by that fact that those metastabilities ends before ...
by HardWareMan
Sun Apr 09, 2017 5:48 am
Forum: Announcement
Topic: Future of SpritesMind
Replies: 38
Views: 3761

Re: Future of SpritesMind

Although I don't know the whole inside SM but I totally agree with you. Same thing happens with me but without having my own forum - I realized long time ago that I can't handle it because sufficient of time. I'm will not make any game or tool because I'm hardware guy. I'm ready to share what I know...
by HardWareMan
Fri Mar 31, 2017 2:59 am
Forum: Hardware
Topic: What would be a DIY dev kit ?
Replies: 13
Views: 1159

Re: What would be a DIY dev kit ?

In theory you could do even better than that if there's enough spare room in the FPGA. 68K bus snooping is theoretically enough to mirror the VDP state into the UMDK's RAM. Of course, you would probably want to fix the DMA issues first. That is real thoughts. Most of DMA can be snooped since it use...
by HardWareMan
Thu Mar 30, 2017 5:41 pm
Forum: Hardware
Topic: What would be a DIY dev kit ?
Replies: 13
Views: 1159

Re: What would be a DIY dev kit ?

Yes, via VDP by M68K CPU way. All I were said previously is UMDK can everything that those devkit does and even more. It is all up to software and FPGA configuration part.
by HardWareMan
Thu Mar 30, 2017 9:41 am
Forum: Hardware
Topic: What would be a DIY dev kit ?
Replies: 13
Views: 1159

Re: What would be a DIY dev kit ?

This is my dream kit: https://www.youtube.com/watch?v=A9zQueGP4iI&index=3&list=PLJAZP-TLMPj4JnSB3XAe2k6zO11jhZ6qq I don't know its full capabilities, or whether it's able to read VRAM (probably not), but it's a simple slot-in-and-play solution that's not unlike UMDK. If one of these ever hits eBay ...
by HardWareMan
Wed Mar 29, 2017 5:18 pm
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 35
Views: 4735

Re: Undefined behavior for ABCD and SBCD

It is dynamic load. Because this sample is more likely nMOS (or pMOS) and not CMOS. And second one (with only two elements) is pure CMOS. Here.
Image
by HardWareMan
Tue Mar 21, 2017 6:16 am
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 35
Views: 4735

Re: Undefined behavior for ABCD and SBCD

I do not understand, hasn't anyone looked at the CPU die shots yet? Basic die shots. Then, Quietust has made a great contribution by isolating the metal traces . Olivier Galibert was able to make use of this layer image, with a few corrections, to produce a full transistor-level schematic of the 680...
by HardWareMan
Mon Feb 27, 2017 2:04 am
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 834
Views: 291215

Re: New Documentation: An authoritative reference on the YM2612

Hi and welcome! I am almost certain that these zig-zags are ESD protection structures. These are compulsory protection circuits that must be placed next to the pads of a silicon die. http://savepic.su/1699689.png A lot of time is passed. Now I sure that analog output have only one transistor that ca...
by HardWareMan
Sat Jan 28, 2017 8:26 am
Forum: Video Display Processor
Topic: Megadrive video timings
Replies: 120
Views: 36919

Re: Megadrive video timings

Thank you!
by HardWareMan
Fri Jan 27, 2017 12:47 pm
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 1922

Re: Genesis/MD test ROMs

Thank you!
by HardWareMan
Fri Jan 27, 2017 12:45 pm
Forum: Video Display Processor
Topic: Megadrive video timings
Replies: 120
Views: 36919

Re: Megadrive video timings

Fileden is died. Who saved those test?
by HardWareMan
Fri Jan 27, 2017 6:39 am
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 1922

Re: Genesis/MD test ROMs

This one? Thank you, I'll try it. But maybe it is time to make some kind set for hardware testing? Maybe we should collect already available ones and make some new one? And place it in special part of Nemesis's site, where anyone can find them.
by HardWareMan
Thu Jan 26, 2017 4:35 am
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 1922

Re: Genesis/MD test ROMs

Thank you for your reply! I'll glad any available test ROM. Indeed, in most cases user must keep an eye by tests. And this is correct. And I hope we make some complex test for it, include some crazy thing like 512 color screen by Oerg866.