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Post by zyrobs on Jun 12, 2021 21:30:30 GMT
argh, I remembered wrong, the P604 has a different layout. No resistors, just a straight trace to the chip pin and it ends under the chip too.
The main difference between the two drives - and two motherboard types - is that the P604 has access led on pin 9, and data sync clock on pin 14, but the P605 has the same data sync clock signal in both pin 9 and 14. Their respective motherboards also expect it to be laid out this way.
So what you should be doing is cut the trace leading to pin 9 of the ribbon cable (it's the cd access led), and bridge pin 9 with pin 14 (serial data sync clock). If you have one of those old EMSIC modchips you could even do this on the modchip side, in case you don't want to defile the CD drive pcb. Otherwise you could cut the thicker trace between the ribbon pin and the test point, that way you can at least easily restore it, since there are no other PCB points to tap into this trace.
But I never tested this so only do it at your own risk. ODEs at the very least work if you do nothing but change the pinouts to follow the above so I'm assuming original drives should behave similarly.
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saskatoon
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Post by saskatoon on Jun 13, 2021 21:19:45 GMT
I will take a closer look when it gets here. I am hoping it will boot with a modchip in line. I was going to put a Phantom in it. What do you mean when you say an old EMSIC modchip? I can pull an old Console Goods V2 chip out of my Saturn if need be. Would likely be easier than modding a drive board.
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Post by zyrobs on Jun 13, 2021 22:06:21 GMT
The old EMSIC type modchips used THT components which were easier to solder lines to. The Consolegoods chip is very much the same. The Phantom chip uses SMT parts which are more difficult to modify.
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saskatoon
Saturn Player
Joined: January 2013
Posts: 111
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Post by saskatoon on Jun 27, 2021 14:11:00 GMT
The old EMSIC type modchips used THT components which were easier to solder lines to. The Consolegoods chip is very much the same. The Phantom chip uses SMT parts which are more difficult to modify. I got my chips in this week. The drive should be here soon. Figured I should ask you how I can modify a Console Goods V2 chip to get the 604 and my mobo talking. Seems easier to start with that than the modifying the drive board. Thanks again for all your help.
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saskatoon
Saturn Player
Joined: January 2013
Posts: 111
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Post by saskatoon on Jul 1, 2021 22:29:25 GMT
Well this is a little silly on my part. Not sure if I am excited or upset. Anyway, I tried the old 605 I pulled out of a unit years ago and it worked first try. I couldn't get this unit to boot unless I replaced the CD assembly so that is what I did. I couldn't bring myself to toss the part and it sat with my Saturn stuff for years.
I put the V3 modchip in and tried the new 604 drive. The disc was read but the game wouldn't boot. The drive/mobo clearly talked but something wasn't there. I thought I would try the old "broken" 605 drive since it was on hand, saved me the hassle of opening my Saturn... it booted the originals and burnts I threw at it. I am going to put some more testing into it but it looks alright. I guess I didn't need that drive after all...
Now I am conflicted. Do I get rid of the drive to someone else who needs it or do I find another broken unit in need of a drive assembly... back down the rabbit hole I go. Ha ha.
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