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nullobject / rygar-fpga

A FPGA core for the arcade game, Rygar (1986).
https://joshbassett.info
MIT License
17 stars 6 forks source link

Fails to boot, resulting in green or black screen #4

Closed bedfelllow closed 4 years ago

bedfelllow commented 4 years ago

Fails to boot, resulting in green or black screen. ROM compiled from mame 0.213 using both Windows batch file, Linux script and Linux cat command. Others have reported the same issue. Maybe memory related, does it support 64MB memory card?

nullobject commented 4 years ago

@bedfelllow There have been reports of people having issues with some RAM modules, so it's likely that your ROMs are fine and the issue lies with my SDRAM controller code.

Will investigate.

mdmmarshall67 commented 4 years ago

I wonder if it's having problems with the sdram timing rather than the size of ram itself .I have 32 mb of sdram .I can get it to work if I reload the rom /core a few times .thanx for the work you put into this core

nullobject commented 4 years ago

@mdmmarshall67 Yes. From what I've seen it looks like a SDRAM timing issue.

nullobject commented 4 years ago

This will be fixed in the next beta release.

nullobject commented 4 years ago

This has been fixed in the latest beta.