Search found 2371 matches

by TmEE co.(TM)
Tue Sep 10, 2019 4:43 pm
Forum: Hardware
Topic: Making Light gun for LCD TV
Replies: 42
Views: 24000

Re: Making Light gun for LCD TV

Composhit is always available, even if one uses RGB. In a proper cable the composhit line is used for sync info for example and also acts as fallback when TV isn't supporting RGB via the SCART. It is also trivial to get luminance info out of both composhit and RGB, and sync you always have side by s...
by TmEE co.(TM)
Sun Sep 08, 2019 1:23 am
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 638

Re: Megadrive was always the answer

Faster CPUs, more RAM and just enhancing VDP and sound is far more useful and much more doable... getting the two sides share single cart is not going to happen more or less though just adding second VDP (and not doing DMA with it) can work out to some extent. It does take a significant FPGA to fit ...
by TmEE co.(TM)
Fri Sep 06, 2019 10:58 pm
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 638

Re: Megadrive was always the answer

FPGAs are the only solution, and stuff where you can fit substantial amount of things are easily 50€ a chip (but some simpler stuff can be done with the cheap 20€ chips), and you still need various other parts such as DACs, memories, connectors and also plastic, assembly and distribution. What is yo...
by TmEE co.(TM)
Fri Sep 06, 2019 1:50 pm
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 638

Re: Megadrive was always the answer

I have already explored this sort of stuff, the hardware part is actually easy and not a huge challenge, but it will be incredibly difficult to keep the costs sane even when I used cheapest parts and nobody will pay price of a modern game console for another 32X essentially, which will only ever see...
by TmEE co.(TM)
Mon Sep 02, 2019 11:31 am
Forum: Megadrive/Genesis
Topic: Sega Tech Docs archive
Replies: 26
Views: 2129

Re: Sega Tech Docs archive

Both links are same...
by TmEE co.(TM)
Fri Aug 30, 2019 10:01 am
Forum: Super 32X
Topic: IC mixing video
Replies: 3
Views: 394

Re: IC mixing video

There is an old RGB encoder chip that's found in some Master System models that has two RGB inputs with means to select between them (I no longer remember the part number of it). I'm not aware of any other all in one things.
by TmEE co.(TM)
Tue Aug 27, 2019 3:32 pm
Forum: Megadrive/Genesis
Topic: Sega Tech Docs archive
Replies: 26
Views: 2129

Re: Sega Tech Docs archive

This is really nice, it is really nice to have everything in one nice place ~
You're free to grab any new things I have gathered up also : http://www.tmeeco.eu/SMD/ http://www.tmeeco.eu/SMS/
by TmEE co.(TM)
Sun Aug 04, 2019 1:07 pm
Forum: Sound
Topic: Looking for latest GEMS
Replies: 29
Views: 10266

Re: Looking for latest GEMS

For now I'm really busy with other things but eventually I could wire up the chips to a counter and record the outputs and give the dump of that, assuming it will be necessary. I don't think the chips do anything more than address decode stuff and their function should be easy to guess. I also tried...
by TmEE co.(TM)
Sun Aug 04, 2019 11:06 am
Forum: Sound
Topic: Looking for latest GEMS
Replies: 29
Views: 10266

Re: Looking for latest GEMS

I have dumped the GALs and the labelled chip and unfortunately the GALs seem to be protected, fusemap reads as all ones, with ID bits giving a pattern. But the labelled chip does look like a good dump. In addition I stripped most parts off the cart and took some photos that should be good enough for...
by TmEE co.(TM)
Wed Jul 17, 2019 11:34 pm
Forum: Controls
Topic: Mega Mouse unused nibbles research
Replies: 30
Views: 1912

Re: Mega Mouse unused nibbles research

There's also the question of why the Nomad doesn't take the Sports Pad… but then again, I recall hearing it doesn't like the link cable in Zero Tolerance? (ironically, since two Nomads would have been the perfect way to use it) Not sure how true is that but I wouldn't be surprised if there's someth...
by TmEE co.(TM)
Tue Jul 09, 2019 2:17 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 7460

Re: Cart Design Questions

You should use multiple vias for the power traces whenever possible. Looking good otherwise ~
by TmEE co.(TM)
Tue Jun 18, 2019 9:39 pm
Forum: Sound
Topic: How DAC works ?
Replies: 8
Views: 751

Re: How DAC works ?

YM2612 outputs for one cycle every 6 cycles (one channel time), while YM3438 output at 5 (at least I recall gaps between each channel) of these 6 cycles IIRC. This gives 3438 much better SNR and also makes it need much less amplification and easier filter to get good output level compared to 2612. T...
by TmEE co.(TM)
Mon Jun 10, 2019 6:32 pm
Forum: Mega/SegaCD
Topic: Japanese MegaCD BIOS 1.00C
Replies: 1
Views: 409

Japanese MegaCD BIOS 1.00C

I was given a chance to dump a new Mega CD BIOS, Japanese version 1.00C and here it is :
http://www.tmeeco.eu/SMD/BIOS/MegaCD%20J%201.00C.BIN
Image
by TmEE co.(TM)
Tue Jun 04, 2019 10:16 am
Forum: Mega/SegaCD
Topic: Questions on writing a new Mega CD emulator
Replies: 114
Views: 10643

Re: Questions on writing a new Mega CD emulator

The big filters are for bandwidth limiting and are responsible for the characteristics of the passband ripple and whatever goes on in the stopband. This isn't really useful to model, especially since whatever plays the sound will do its own stuff like that, mangling whatever you did (and you need to...