17 Reply by ZAIUSZ

(96 replies, posted in Sega)

yogi wrote:

OH NO, sorry but I gave you a lot of wrong info.
Was just re-reading the Z-80 source code
http://little-scale.com/SMSM/SMSM_100/S … de_Z80.txt
And without the Arduino connected it DOESN'T play the start up sound. That comes from the Arduino code. The Z80 code just sits in a loop waiting for input  and when it gets some it stuffs it to the PSG and then waits again.
  The fact that your's is stalled at the Splash screen still makes me think its an EPROM issue, cause the bootloader hasn't finished.
Yogi

Ahh ok.  Well I'm considering splicing a light phaser to do this right... there must be a certain revision controller that little scale used since the only ones i've ever seen have only 7 wires.  I think it will be way more reliable anyway and i don't need to hold the connector on with elastics..

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18 Reply by ZAIUSZ

(96 replies, posted in Sega)

Excellent information thank you.  I read about "padding" earlier, from what I understand is this used to terminate then end of the block if the size of the EPROM is too large?  Is it necessary on the 27C256(this is what it was written to) with this code?

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19 Reply by ZAIUSZ

(96 replies, posted in Sega)

Hi Yogi thanks for the info.  Yea, I had to outsource the burning to a guy about 5 hours from me, he is going to reburn one for me and we'll try that.

Regarding the 'bank mapper', i don't know much (or anything really) about eproms but from what i've read here I assume that the codes are written in blocks and the mapper looks up which block to load or something like that.  In that case, I assume having the external chip for the mapper would cause problems and not work, the one to avoid.  I can say the pcb i used has only the spot from the eprom and one electro and one ceramic cap, according to the blog this is the one you need.
I do have a logic probe anyway, never used it yet but should be simple enough. 
So anyway, are you saying that even if there is nothing plugged into the master system in the game port I should still hear the new startup sound?  All I hear is the standard sega startup and then it just hangs on that screen.

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20 Reply by ZAIUSZ

(96 replies, posted in Sega)

Howdy folks, first off, this is an awesome project and for years I've wanted to make music on a master system.  The sound chip has a very special sound!  I was very excited to discover this project and I've purchased everything I need.  I'm wondering if anyone else here has gotten this to work here in North America yet?
I've managed to find someone to burn me the EPROM on the correct chip and I assembled everything last night.  I used the cart for Rescue Mission since it has the 717-5519D revision board, but can't seem to get the cart passed the master system splash screen.  I can pop the game rom back into the socket and it works, so I can confirm my soldering is fine.
Is it important that the Arduino connection is in there to work?  I'm not sure if it is actually making proper contact since I had to use a computer DB9 connector and the connection is very loose.  I tried splicing a controller but discovered that it does not have a wire for pin 7 at all, apparently this is only for the light phaser. Also discovered that the Arduino IDE latest version won't send the code to the Arduino, it finds errors but if I use the old version 1 IDE is appears to work.

Anyways, if anyone has any suggestions and could help I would greatly appreciate it, I'd love to get this working and start experimenting with some sounds!

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