Martinmurphy30
User
Trying to repair this for a friend, originally booted up with sprite errors. Now just displays: Ram check free error fff03ff
Been all over this removing rams and testing, bridging pins and testing...only change I can get in the error is messing with the upper and lower (background/tile rams?). Has anyone any idea what a free ram is? I've pulled and tested 68k work ram-all ok, z80, rom and ram- all ok, 3 6116 rams bottom right of the PCB beside a big flat pack custom- all ok, 4 rams beside the custom sprite generator and these also test ok...all that's left is 8 2114 equivalents in the bottom left corner and the previously mentioned upper and lower rams.....tried to decipher the error message using the mame memory map but I can't tell what I should be looking for! Any help/advice appreciated here folks! P.s these boards have the biggest ground and 5v planes I have ever come across...desoldering cleanly is a complete nightmare 😭
Been all over this removing rams and testing, bridging pins and testing...only change I can get in the error is messing with the upper and lower (background/tile rams?). Has anyone any idea what a free ram is? I've pulled and tested 68k work ram-all ok, z80, rom and ram- all ok, 3 6116 rams bottom right of the PCB beside a big flat pack custom- all ok, 4 rams beside the custom sprite generator and these also test ok...all that's left is 8 2114 equivalents in the bottom left corner and the previously mentioned upper and lower rams.....tried to decipher the error message using the mame memory map but I can't tell what I should be looking for! Any help/advice appreciated here folks! P.s these boards have the biggest ground and 5v planes I have ever come across...desoldering cleanly is a complete nightmare 😭
