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creaothceann
PostPosted: Mon Dec 11, 2017 7:01 pm 
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Wikipedia says the Super FX can upload graphics from the cartridge to VRAM. Shouldn't therefore the PA lines on the connector be bidirectional?
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lidnariq
PostPosted: Mon Dec 11, 2017 7:04 pm 
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Location: Seattle
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.
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Señor Ventura
PostPosted: Wed Dec 13, 2017 2:48 pm 
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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.
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tepples
PostPosted: Wed Dec 13, 2017 5:21 pm 
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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.
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Firebrandx
PostPosted: Sun Dec 31, 2017 8:00 pm 
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OP's link is broken. Anyone have a mirror link?
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sanni
PostPosted: Mon Jan 01, 2018 11:05 am 
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Not sure if it's the most recent version


Attachments:
snes_schematic_color.pdf [724.91 KiB]
Downloaded 45 times
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whicker
PostPosted: Mon Jan 01, 2018 11:09 pm 
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I think the commas went away, or something.

https://wiki.superfamicom.org/schematics-ports-and-pinouts
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lidnariq
PostPosted: Mon Jan 01, 2018 11:56 pm 
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Here's the last version of snes_schematic_color I have, four minor revisions newer than what sanni posted-


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File comment: version 1.5, internal date stamp of 2014 Feb 24
snes_schematic_color.pdf [269.54 KiB]
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Firebrandx
PostPosted: Tue Jan 02, 2018 12:29 am 
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whicker wrote:
I think the commas went away, or something.

https://wiki.superfamicom.org/schematics-ports-and-pinouts


If you click on that link you posted, you'll see all the schematic file links are broken. :roll:
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