Search found 21 matches

by jotego
Mon Apr 17, 2017 9:31 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 421889

Re: New Documentation: An authoritative reference on the YM2612

I am glad to see the thread still alive. We do not know everything about the YM2612 yet ! About this one, I've run a few tests on VA4 MD1 (with discrete YM2612) and VA0 MD2 (with 315-5660 ASIC) regarding the BUSY flag and here is what I figured or confirmed from Sauraen die shot analysis : 1) BUSY f...
by jotego
Wed Mar 01, 2017 11:59 am
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 421889

Re: New Documentation: An authoritative reference on the YM2612

Sauraen wrote:The only sort of protection I've seen on the chip is some sort of resistor on the digital input pins. The YM2612 isn't CMOS so large protection transistors (really diodes) weren't required.
I see. ESD really became popular with CMOS processes.
by jotego
Sun Feb 26, 2017 8:30 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 421889

Re: New Documentation: An authoritative reference on the YM2612

Hi all, I have finished reading the full thread and I have enjoyed every bit of it. Let me add to it now. First , I am working on a verilog module that replicates in hardware the YM2612/YM3438 to a very precise level. The internal operation is likely to be pretty much the same as the original. Every...
by jotego
Tue Feb 21, 2017 8:45 am
Forum: Megadrive/Genesis
Topic: Write Genesis program to test YM2612
Replies: 5
Views: 1457

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. The operator data output mode should work from MD too... except there is no way to output the data to a memory... :| Indeed I just need to check some minor things that ...
by jotego
Tue Feb 21, 2017 8:42 am
Forum: Megadrive/Genesis
Topic: Write Genesis program to test YM2612
Replies: 5
Views: 1457

Re: Write Genesis program to test YM2612

Your methods look correct but if you use SGDK, why are you rewriting all these methods which already exists ? Z80_requestBus(..) Z80_releaseBus() YM_writeRegSafe(..) YM2612_writeRegSafe(..) I think there is everything you need to do some basic YM tests. Thank you! I used these functions and was abl...
by jotego
Mon Feb 20, 2017 7:41 pm
Forum: Megadrive/Genesis
Topic: Write Genesis program to test YM2612
Replies: 5
Views: 1457

Write Genesis program to test YM2612

Hello, This is my first post. I am developing a Verilog version of YM2612, which will be used to run the Genesis on FPGA. I have been doing it with the help of Sauraen, who is a member of the forum. I am quite advanced with this and now I can actually run the Genesis on FPGA. I have some issues with...