Search found 2246 matches

by TmEE co.(TM)
Sun May 21, 2017 8:04 am
Forum: Megadrive/Genesis
Topic: Large ROM images and Sega CD + 32X
Replies: 3
Views: 134

Re: Large ROM images and Sega CD + 32X

When MCD is connected the 400000...7FFFFF range will have MCD BIOS and other bits of it visible there. When you disable the check stuff will probably run but sooner or later there will be hardware damage due to bus fighting that happens betwees MCD and the everdrive cart. Cart side tends to win over...
by TmEE co.(TM)
Fri Apr 28, 2017 11:22 am
Forum: Video Display Processor
Topic: Titan's Mega Drive tech docs including Debug Register
Replies: 34
Views: 1638

Re: Titan's Mega Drive tech docs including Debug Register

There is no mirroring effect going on when the width is 64 tiles, only the first 32 rows get used, when the width is 32 tiles it does produce the mirroring effect, 0...31, 0...31, 64...95, 64...95. EDIT : I tested out all combinations : H V 00 00 - 32x32 00 01 - 32x64 00 10 - See above 00 11 - 32x12...
by TmEE co.(TM)
Thu Apr 27, 2017 3:45 pm
Forum: Demos
Topic: OVERDRIVE II
Replies: 28
Views: 1515

Re: OVERDRIVE II

315-5433 in the IO+bus management chip. VDP is the other chip (315-5313 / 5313A / 5313A-01)
by TmEE co.(TM)
Mon Apr 24, 2017 2:47 pm
Forum: Megadrive/Genesis
Topic: Info on mapper used for UMK3 hack
Replies: 1
Views: 125

Re: Info on mapper used for UMK3 hack

Flat mapping with !DTACK generation in 9th and 10th MByte. It won't work with 32X present, and causes bus fights when MCD is present.
by TmEE co.(TM)
Thu Apr 20, 2017 7:59 pm
Forum: Announcement
Topic: Future of SpritesMind
Replies: 30
Views: 1429

Re: Future of SpritesMind

No PUNishing puns, puns are the best <3
by TmEE co.(TM)
Wed Apr 19, 2017 8:17 am
Forum: Megadrive/Genesis
Topic: Paprium and it's sound engine
Replies: 16
Views: 640

Re: Paprium and it's sound engine

32X sends audio through cart to MD. AV in to AV out is just a passthrough. The loading is very easy to take care of. Something like this is able to drive even 2 ohm speakers without drop (assuming you use transistors with right current rating and don't go overboard with emmiter resistors) in level a...
by TmEE co.(TM)
Tue Apr 18, 2017 8:23 pm
Forum: Megadrive/Genesis
Topic: Paprium and it's sound engine
Replies: 16
Views: 640

Re: Paprium and it's sound engine

MD2 VA0 and 1 have no 75ohm loading, VA3 and VA4 do. Nomads and Genesis3s do not connect the audio lines.
by TmEE co.(TM)
Tue Apr 18, 2017 12:19 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 831
Views: 266043

Re: New Documentation: An authoritative reference on the YM2612

You get clicks and whatnot on note ons, they didn't try to do anything about it whatsoever (easiest thing would have been allowing te select if phase generator is reset by note on or not) and having a wrong sample or two at a noteon wasn't gonna be a problem because it is gonna be masked by the clic...
by TmEE co.(TM)
Sun Apr 09, 2017 5:37 pm
Forum: Announcement
Topic: Future of SpritesMind
Replies: 30
Views: 1429

Re: Future of SpritesMind

I certainly don't want this place to disappear, all the information here will be lost then, and it is good info that you cannot find elsewhere. Information is why I keep visiting this place, and as far as information goes, I'll be sure to add more when I am done with gathering and formulating. Like ...
by TmEE co.(TM)
Mon Apr 03, 2017 7:21 am
Forum: Megadrive/Genesis
Topic: Sprite Data Mashed Up
Replies: 3
Views: 265

Re: Sprite Data Mashed Up

Link value isn't being advanced so you only see one sprite.
by TmEE co.(TM)
Sun Apr 02, 2017 7:23 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 831
Views: 266043

Re: New Documentation: An authoritative reference on the YM2612

I'd like to add that it is possible to write stuff to YM at sample rate (1 write every 144 YM clocks). I made YM run at same clock as Z80 and made code write one sample every 144 cycles and I got all writes intact. It is not possible to get perfect synchronity to YM like that in normal condition, wh...
by TmEE co.(TM)
Mon Feb 20, 2017 12:11 pm
Forum: Video Display Processor
Topic: Sprite disappearing on certain conditions ???
Replies: 7
Views: 515

Re: Sprite disappearing on certain conditions ???

I did Y=0 instead of X=0 in my first MD game when I discovered this haha.
by TmEE co.(TM)
Wed Feb 15, 2017 9:39 pm
Forum: Video Display Processor
Topic: Sprite disappearing on certain conditions ???
Replies: 7
Views: 515

Re: Sprite disappearing on certain conditions ???

EDIT: During rendering, sprite with X coord of 0 can be used to clip sprites with lower priority if it isn't the highest priority sprite on that line. There needs to be at least one higher priority sprite on that line first before clipping can be done, if that condition is satisfied then all lower p...
by TmEE co.(TM)
Wed Feb 15, 2017 3:15 am
Forum: Cartridge
Topic: sram noob?
Replies: 1
Views: 229

Re: sram noob?

There isn't any, you got to do manual address decode. Normally top 2MBytes are used as SRAM range while bottom 2 are ROM range. Games larger than 2MB have a banker that allows top 2MB to be ROM or SRAM depending on last value written to !TIME range. EDIT: Write strobes are !LWR and !UWR, pins B28 an...
by TmEE co.(TM)
Sat Jan 28, 2017 4:01 pm
Forum: Video Display Processor
Topic: Mode 4 VRAM Timing
Replies: 4
Views: 494

Re: Mode 4 VRAM Timing

I snooped around on my SMS2 and it seems to behave same way. In addition blanking has same timings on TMS99xx VDPs on SMS, and possibly same function. TMS does 64 refreshes for DRAMs in blanking during first 256 pixels (and gives 64 access slots) and in remainder of the line there's 42 access slots....

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