It is currently Mon Nov 20, 2017 7:56 pm

All times are UTC - 7 hours





Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Tue Oct 30, 2012 10:33 pm 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Family Trainer 3: Aerobics Studio

I've been trying to figure out the M50805 chip and how it works. So far I don't believe there are any documents online that describe its functions. I've attempted to search for patents, contact Mitsubishi, and get a hold of the warehouse that they referred me to without any luck of finding datasheets. So, I've debugged the ROM and found out a few things:

$6000
xSxx xPPP
P = Play sample number.
S = Stop sample.

I believe there are a maximum of 8 samples. I've made it through all of the modes and realize that the max sample value before it is DEY'd is $08 (which is #$07). Also at init #$FF is written to $6000. I'm not sure of its function.

Does anyone have this cart and a CopyNES to verify? Is M50805 a mask ROM?

Also I believe since there is additional audio hardware that CNROM does not entirely suffice for Family Trainer 3's mapper. It should be assigned another and hopefully the M50805 can be dumped or decapped if necessary.


Top
 Profile  
 
PostPosted: Wed Oct 31, 2012 12:20 am 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 6447
Location: UK (temporarily)
Some cursory digging around and looking closely at the board: I think it's a microcontroller of some sort.


Top
 Profile  
 
PostPosted: Wed Oct 31, 2012 3:54 am 
Offline

Joined: Thu Oct 05, 2006 6:29 am
Posts: 911
There's this topic which discusses the same chip.


Top
 Profile  
 
PostPosted: Wed Oct 31, 2012 5:06 am 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Exactly. It's neither concise nor goes into detail about the cart or the chip. We don't have the full story yet.


Top
 Profile  
 
PostPosted: Thu Nov 01, 2012 7:36 pm 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
So, I ended up paying a little too much than I wanted for a Family Trainer 3: Aerobics Studio cart. I'll do what I can with the debugger on the CopyNES. After that I may send it somewhere to get destroyed for science.


Top
 Profile  
 
PostPosted: Sat Nov 03, 2012 9:11 am 
Offline

Joined: Wed Jul 13, 2005 3:14 pm
Posts: 355
The only thing I was ever able to find out about the chip was this short spec sheet: http://www.datasheetarchive.com/shortfo ... 5XXXP.html which was the only reason I knew, for instance, that it has 960 bytes of ROM


Top
 Profile  
 
PostPosted: Sat Nov 03, 2012 7:48 pm 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
I think I finally found a way to obtain the document. I'll attach it if I am successful.


Top
 Profile  
 
PostPosted: Sun Nov 04, 2012 7:53 am 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Got a hold of the document. I'm analyzing it now, but wanted to make sure I have it mirrored for other people as well.


Attachments:
File comment: Mitsubishi M50805 / M50806 datasheet.
m50805-m50806.pdf [554.24 KiB]
Downloaded 291 times
Top
 Profile  
 
PostPosted: Sun Nov 04, 2012 12:00 pm 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 6447
Location: UK (temporarily)
Well done! That's neat, it's Mitsubishi's analog (using PARCOR) of TI's TMC0281(which used LPC) but using playback from an internal ROM.


Top
 Profile  
 
PostPosted: Mon Nov 05, 2012 8:04 pm 
Offline

Joined: Wed Jul 13, 2005 3:14 pm
Posts: 355
Cool, may I ask how you managed to get that? Did Mitsubishi hook you up?


Top
 Profile  
 
PostPosted: Tue Nov 06, 2012 12:15 pm 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Fell off the back of a truck.


Top
 Profile  
 
PostPosted: Sat Mar 02, 2013 8:15 pm 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Here's also a neat toolkit to figure out how PARCOR works:

http://sp-tk.sourceforge.net/

Anybody still in school have access to the Wiley library?

http://onlinelibrary.wiley.com/doi/10.1 ... 2/abstract

This document would be good to have to figure out tone generation in PARCOR.


Top
 Profile  
 
PostPosted: Sat Mar 02, 2013 9:29 pm 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 6447
Location: UK (temporarily)
The datasheet actually mentions that: "46 bit capacity for [...] one frame of [...] amplitude, pitch, and K-parameters".

They start with a frequency for an impulse train and then specify a set of coefficients for the "8 stage lattice digital filter" that starting waveform goes through. The ability to get monophonic musical control out of it would be the same as what was done in Speak'n'Music, and what makes it tone generation instead of speech is the 1/4 as fast frame rate.

In any case, the M50805 doesn't look like it supports playback from anything but ROM...


Top
 Profile  
 
PostPosted: Sun Mar 03, 2013 8:40 am 
Offline
User avatar

Joined: Thu Jan 03, 2008 1:48 pm
Posts: 543
Yeah. It supports playback from internal mask ROM. But it also says that when Mode Select is on External Memory mode that EPROM and RAM can be used through D2 (DTIN).


Top
 Profile  
 
PostPosted: Tue May 10, 2016 5:39 pm 
Offline
User avatar

Joined: Sat Jul 12, 2014 3:04 pm
Posts: 950
B00daW wrote:
Here's also a neat toolkit to figure out how PARCOR works:

http://sp-tk.sourceforge.net/

Anybody still in school have access to the Wiley library?

http://onlinelibrary.wiley.com/doi/10.1 ... 2/abstract

This document would be good to have to figure out tone generation in PARCOR.

I did, but I printed it out rather than save. Whoops?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 9 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group