Search found 478 matches

by r57shell
Sun Apr 09, 2017 2:45 pm
Forum: Announcement
Topic: Future of SpritesMind
Replies: 38
Views: 11198

Re: Future of SpritesMind

In short: noone owe you anything. Nail it! Hold breathe, read it whole. Some recents events (life and cat fighting) made me think about SpritesMind, and I should make it clear for you. It's very good, that you're reviewing your world view. Last month, I closed it ... 1 week. And you were "redicilous...
by r57shell
Wed Mar 29, 2017 4:59 pm
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 14034

Re: Undefined behavior for ABCD and SBCD

Mask of Destiny wrote:
flamewing wrote:I am not sure what the thick line means on the top image, though.
IIRC, that's VCC.

Thanks for the test ROM by the way. Very helpful in fixing the remaining issues in BlastEm's sbcd implementation.
Question is what means element with thick line.
by r57shell
Tue Mar 21, 2017 12:58 pm
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 14034

Re: Undefined behavior for ABCD and SBCD

Ah, yes, because looking at completely unlabelled transistor-level schematics and figuring out what each transistor is doing, and what signal each wire corresponds to, is extremely easy. Yes. For me, who is not familiar with transistor stuff is not easy to figure out what it is: http://i.imgur.com/...
by r57shell
Tue Mar 21, 2017 10:20 am
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 14034

Re: Undefined behavior for ABCD and SBCD

I can easily post the source for mine; but since it was done in pure assembly with a binary table generated by the above C code I posted (for speed reasons), there is little benefit. Okay. Speed reasons hmm. I will check out your BCD implementation to see how accurate it is; but you did ask "Someon...
by r57shell
Mon Mar 20, 2017 5:48 pm
Forum: Megadrive/Genesis
Topic: Undefined behavior for ABCD and SBCD
Replies: 36
Views: 14034

Re: Undefined behavior for ABCD and SBCD

flamewing wrote:This is the ROM, in case anyone wants to test on emulators.
My ROM have same goal, but:
1) it has source
2) it has easier bcd implementation
AFAIR it has correct bcd implementation
by r57shell
Tue Feb 21, 2017 8:03 pm
Forum: Megadrive/Genesis
Topic: Write Genesis program to test YM2612
Replies: 5
Views: 1278

Re: Write Genesis program to test YM2612

operator output is too fast to figure out what did you read.
by r57shell
Tue Feb 21, 2017 5:55 am
Forum: Megadrive/Genesis
Topic: Write Genesis program to test YM2612
Replies: 5
Views: 1278

Re: Write Genesis program to test YM2612

Problem is that you can't read anything from YM2612 except status.
Sauren have found debug stuff, but I doubt it's usable from MD.
by r57shell
Tue Feb 14, 2017 6:00 pm
Forum: Megadrive/Genesis
Topic: Please help decide on projection
Replies: 12
Views: 3004

Re: Please help decide on projection

greatkreator wrote:StarCraft 1 uses isometric visualization and "plain" 2D physics.
Ah, now I got it. Yeah, physics is 2D indeed.
(while trying to check starcraft, found this awesomeness https://www.twitch.tv/certicky )
by r57shell
Tue Feb 14, 2017 5:05 pm
Forum: Megadrive/Genesis
Topic: Please help decide on projection
Replies: 12
Views: 3004

Re: Please help decide on projection

greatkreator wrote:For example StarCraft 1 uses such a scheme.
Really? Tell me how to enable other one? Starcraft I guess using same as everywhere starting from Rock 'n' Roll Racing: isometry (X-COM).
by r57shell
Tue Feb 14, 2017 5:02 pm
Forum: Megadrive/Genesis
Topic: 32-bit integer to string routine
Replies: 10
Views: 2292

Re: 32-bit integer to string routine

It's not obvious that abcd stuff is faster than division.
For better understanding it would be nice to have division code too.
And, both should have timings listed I guess.

From my opinion, easier & faster just subtract 36 times.
But we will see only after comparing.
by r57shell
Sat Feb 11, 2017 3:12 pm
Forum: Megadrive/Genesis
Topic: Please help decide on projection
Replies: 12
Views: 3004

Re: Please help decide on projection

left one looks wierd because it's not Orthographic projection.
I have no idea how to make good Orthographic projection with camera set "more top" than right image. So, it's up to you.
by r57shell
Fri Jan 27, 2017 7:51 pm
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 4182

Re: Genesis/MD test ROMs

Have you found that two packs? Or, I have to track it down?
Ok, one of them here: https://bitbucket.org/eke/genesis-plus- ... d_test.zip
Oh, and VDP_TEST.zip is inside.
There is also on smspower I guess, some test ROMs.
by r57shell
Wed Jan 25, 2017 7:41 pm
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 4182

Re: Genesis/MD test ROMs

I've seen somewhere bunch of Genesis Emulator test ROMs, but I don't remember where it was. I thought that it was in genplus-gx repo, but I don't see it there. I'll try to google stuff. But, probably it's not what you looking for. Edit: it was indeed in genplus-gx repo. https://www.reddit.com/r/emul...
by r57shell
Sun Dec 25, 2016 1:53 pm
Forum: Video Display Processor
Topic: MD VDP color levels
Replies: 10
Views: 6442

Re: MD VDP color levels

You can calculate deviation. It's really small.
Checkout this thread: viewtopic.php?f=22&t=1389
by r57shell
Mon Oct 10, 2016 7:47 pm
Forum: Tools
Topic: 68000 instruction timing from source?
Replies: 14
Views: 3607

Re: 68000 instruction timing from source?

yes it would, so? (in case if you testing that bit)