Search found 89 matches
- Mon Apr 24, 2017 2:44 pm
- Forum: Megadrive/Genesis
- Topic: Info on mapper used for UMK3 hack
- Replies: 1
- Views: 2970
Info on mapper used for UMK3 hack
I've been looking for info on this online, from what I've been able to find it didn't use the SSF2 mapper but I can't seem to find specific info on how it mapped its data in the cartridge space. Anyone have any info on this?
- Thu Apr 20, 2017 6:19 pm
- Forum: Announcement
- Topic: Future of SpritesMind
- Replies: 38
- Views: 56217
Re: Future of SpritesMind
I for one support our new BigEvilCorporation overlord...
- Tue Apr 18, 2017 8:27 pm
- Forum: Megadrive/Genesis
- Topic: Paprium and it's sound engine
- Replies: 16
- Views: 17349
Re: Paprium and it's sound engine
Really?! I'm going to have to test this tonight - I knew I bought 10 megadrives for a reason!TmEE co.(TM) wrote:MD2 VA0 and 1 have no 75ohm loading, VA3 and VA4 do
I also always reference the VA0 and VA1 schematics, I've never seen a Model 2 schematic with 75 ohm input loading.
- Tue Apr 18, 2017 8:12 pm
- Forum: Megadrive/Genesis
- Topic: 68000 programming optimization tips? (for speed)
- Replies: 28
- Views: 39521
Re: 68000 programming optimization tips? (for speed)
oops! Thanks for pointing out my mistake!
Edit:
Well wait, here's the table:
http://oldwww.nvg.ntnu.no/amiga/MC680x0 ... mmove.HTML
Oh I see, is optimized, but is not.
Edit:
Well wait, here's the table:
http://oldwww.nvg.ntnu.no/amiga/MC680x0 ... mmove.HTML
Oh I see,
Code: Select all
move.l D0, -(A0)
Code: Select all
move.l -(A0), D0
- Tue Apr 18, 2017 7:56 pm
- Forum: Megadrive/Genesis
- Topic: Paprium and it's sound engine
- Replies: 16
- Views: 17349
Re: Paprium and it's sound engine
You can most definitely feed audio into the Megadrive via the SL and SR pins on the cartridge port - this is how the FM Power Base Converter works. One thing to note however is that the input impedance is dractically different on Model 1 (75 ohms) and Model 2 ( > 10Kohms) which invariably leads to a...
- Tue Apr 18, 2017 7:42 pm
- Forum: Megadrive/Genesis
- Topic: 68000 programming optimization tips? (for speed)
- Replies: 28
- Views: 39521
Re: 68000 programming optimization tips? (for speed)
There are "mundane" optimizations you can figure out by staring at the instruction set long enough, most of which are covered in BigEvilCorporations links shared above. But as one example, you should try post-incrementing with the address registers instead of pre-decrementing since post-inc is faste...
- Mon Apr 10, 2017 7:02 pm
- Forum: Announcement
- Topic: Future of SpritesMind
- Replies: 38
- Views: 56217
Re: Future of SpritesMind
You need moderators. At least two who've contributed or been here the longest. Positive members with good judgement. People you can talk to about any problems regarding the site. Bounce ideas off of. People to work directly in the forums interacting with members, enforcing the rules and getting the...
- Fri Mar 31, 2017 3:27 pm
- Forum: UMDK
- Topic: UMDK Manufacturing - word of advice
- Replies: 10
- Views: 18775
Re: UMDK Manufacturing - word of advice
All I wanted was for everyone to know when to use HASL vs. when to use hard-gold plating because these things are important for PCB edge connections. I'm really sorry it caused such a big fuss...
- Mon Mar 20, 2017 12:19 pm
- Forum: UMDK
- Topic: UMDK Manufacturing - word of advice
- Replies: 10
- Views: 18775
Re: UMDK Manufacturing - word of advice
Sure thing! Here's picture I took of two boards of mine: one ENIG and one HASL, both went through about 300 mating cycles.
Identifying which you have is very easy; ENIG is gold coloured while HASL is grey.
https://twitter.com/db_electronics/stat ... 2031174657
Identifying which you have is very easy; ENIG is gold coloured while HASL is grey.
https://twitter.com/db_electronics/stat ... 2031174657
- Sat Mar 18, 2017 5:22 pm
- Forum: UMDK
- Topic: UMDK Manufacturing - word of advice
- Replies: 10
- Views: 18775
UMDK Manufacturing - word of advice
[KanedaFR : Based on some previous issues with Minty, db's contacted me to clairy explain his goal, following a chat he had with a lucky UMDK's owner. I think it is in sync with this forum's goal : share info and help each other. Else I would have already deleted this post. Please take it for what ...
- Wed Mar 30, 2016 12:22 am
- Forum: Tools
- Topic: Retro Graphics Toolkit
- Replies: 117
- Views: 192045
Re: Retro Graphics Toolkit
FYI I just built and installed RetroGraphicsToolkit on Ubuntu 14.04 and it needed all of this before building correctly: sudo apt-get install libreadline6-dev sudo apt-get install libfltk1.3-dev sudo apt-get install zlib1g-dev sudo apt-get install libpng-dev sudo apt-get install libjpeg-dev sudo apt...
- Fri Feb 19, 2016 7:22 pm
- Forum: Cartridge
- Topic: SRAM write protect
- Replies: 5
- Views: 12921
Re: SRAM write protect
My Super Street Fighter II cartridge had a modification compared to db-elec's, there's a 0.1uF ceramic capacitor soldered between pins 8 (/VRES) and 11 (ground) of the 315-5779 custom. The PCB layout is identical, the capacitor is directly soldered to the pins of the chip as some kind of post-assem...
- Mon Feb 08, 2016 1:39 pm
- Forum: Hardware
- Topic: Hmmmm.......?
- Replies: 25
- Views: 47538
Re: Hmmmm.......?
Very good work! Auto-routers are for wimps! (And blokes who don't care for signal integrity)...
- Mon Feb 01, 2016 4:24 pm
- Forum: Hardware
- Topic: [WIP] Not a debug cart project!
- Replies: 46
- Views: 60070
Re: [WIP] Not a debug cart project!
MegaWifi!!!
- Mon Feb 01, 2016 4:19 pm
- Forum: Hardware
- Topic: Hmmmm.......?
- Replies: 25
- Views: 47538
Re: Hmmmm.......?
Very happy to see actual level converters on there...