Search found 704 matches

by HardWareMan
Wed Apr 19, 2017 3:25 am
Forum: Hardware
Topic: DS 16
Replies: 2
Views: 531

Re: DS 16

Also it has no VD12-VD15. But it provide higher addresses and CE0. Also, it provides MRES and M3. So, basic signals it takes from EXT port, higher addresses and CE0 via this cartrige (that's why 244s need for) and able to MRES (more powerfull than VRES!) and M3. Simple and clever I think.
by HardWareMan
Tue Apr 18, 2017 2:36 pm
Forum: Sound
Topic: too many YM2612 infos ?
Replies: 14
Views: 1233

Re: too many YM2612 infos ?

As I said before, leave discussion and create separate topic for pure checked info only.
by HardWareMan
Thu Apr 13, 2017 5:46 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 7056

Re: MD hangs after playing any PCM file

Pity that I haven't UMDK, but maybe somehow my records from IC BD M5 VA1 with running the Sonic 1 on FLASH card will help. The legend: Yellow - CE0 Cyan - VA15 Purple - DTACK Blue - CAS2 Here the moment of ending "SEGA": http://savepic.ru/13517484.png http://savepic.ru/13523628.png http://savepic.ru...
by HardWareMan
Wed Apr 12, 2017 3:24 am
Forum: Announcement
Topic: Future of SpritesMind
Replies: 38
Views: 4414

Re: Future of SpritesMind

I actually have some Mega Drive hardware business to talk with you but SpritesMind doesn't let me touch PMs at all =/ (neither read nor write) so huh is there some other way to contact you? Why so? I was able to use PMs right after register. Did you try to set it here? http://savepic.ru/13543419.png
by HardWareMan
Tue Apr 11, 2017 10:15 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 7056

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: 7056

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: 7056

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: 4414

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: 1343

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: 1343

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: 1343

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: 5380

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: 5380

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: 303896

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: 38170

Re: Megadrive video timings

Thank you!