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Re: Legible SNES Schematics

Posted: Mon Dec 11, 2017 7:01 pm
by creaothceann
Wikipedia says the Super FX can upload graphics from the cartridge to VRAM. Shouldn't therefore the PA lines on the connector be bidirectional?

Re: Legible SNES Schematics

Posted: Mon Dec 11, 2017 7:04 pm
by lidnariq
There is only one bus master in the SNES, and that's the S-CPU and its DMA unit. The SFX is not what's doing the uploading.

Re: Legible SNES Schematics

Posted: Wed Dec 13, 2017 2:48 pm
by SeƱor Ventura
I always believed that DMA can transfer tiles directly from the rom to the vram... and with an sfx we still have the dma doing the same job.

The SFX don't do anything in that way.

Re: Legible SNES Schematics

Posted: Wed Dec 13, 2017 5:21 pm
by tepples
It can.

DMA transfers data from one bus to the other. ROM and cart RAM are on bus A, and the PPU's VRAM data port is on bus B. The console's WRAM is on bus A or bus B (but not both at once). DMA from cart RAM to WRAM pauses the 65816, and I think the GSU is paused as well.

Re: Legible SNES Schematics

Posted: Sun Dec 31, 2017 8:00 pm
by Firebrandx
OP's link is broken. Anyone have a mirror link?

Re: Legible SNES Schematics

Posted: Mon Jan 01, 2018 11:05 am
by sanni
Not sure if it's the most recent version

Re: Legible SNES Schematics

Posted: Mon Jan 01, 2018 11:09 pm
by whicker
I think the commas went away, or something.

https://wiki.superfamicom.org/schematic ... nd-pinouts

Re: Legible SNES Schematics

Posted: Mon Jan 01, 2018 11:56 pm
by lidnariq
Here's the last version of snes_schematic_color I have, four minor revisions newer than what sanni posted-

Re: Legible SNES Schematics

Posted: Tue Jan 02, 2018 12:29 am
by Firebrandx
whicker wrote:I think the commas went away, or something.

https://wiki.superfamicom.org/schematic ... nd-pinouts
If you click on that link you posted, you'll see all the schematic file links are broken. :roll:

Re: Legible SNES Schematics

Posted: Mon Sep 11, 2023 10:52 am
by Deltablade
https://drive.google.com/file/d/1BVGpgo ... sp=sharing

Hello, my name is Arthur, since my friend posted here the connection diagram for the Super Nintendo motherboard, here I made an eagle library that you can import from my sch and I'll leave here the download of the parts I made for Autodesk Eagle 9 and it took a while 4 hours to do it, enjoy it and download it if you want to make it

Re: Legible SNES Schematics

Posted: Tue Oct 03, 2023 2:15 pm
by Marioshroomed
I'm very very late to the discussion but wanted to ask, how do you got about creating the schematic for computer components? Like the chips in the snes.

Re: Legible SNES Schematics

Posted: Wed Oct 04, 2023 4:10 pm
by creaothceann
You look at the chips and their markings, and use a digital multimeter for testing for continuity to see which components are connected via which traces.

Then you take a drawing program of your choice and create a document with your findings.

Re: Legible SNES Schematics

Posted: Sun Dec 10, 2023 2:34 pm
by Gemz
Hello, does anyone have 1chip schematics? I'm having a really strange issue with the audio output on one unit, all caps are good and chips U6 and U10 have proper Voltage supply, but audio is coming out super low, only audible with an amp or tv maxed out and even that way it outputs a very low signal, I've checked the cable too and tried many tvs, I've even measured followed and jumpered the audio signal straight from pins 1 and 4 out if the DAC (U6) and its coming really low even from those pins, basically audio comes out from those pins really low and it goes unchanged all the way to the final pinout 11-12 of the output cable, composite and RF all the same since the mix only directs that signal that is already low, I've tried everything I could think of, I have the schematic for the pal version but mine is ntsc, anyone have any idea of what could be causing this? Video comes out pefectly only audio the problem.