Hi everybody!
I'm also a digikey customer and got my board about 3 weeks ago - unsurprisingly with the 'edbl' SRAM chip and the same problems other people told before. Foft's hint to change the pin setting does the magic - no ram problems anymore :-)
Thank you Foft!
I added the following lines to the qsf (atari800core_20140119.tar.xz):
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_CE_N
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_LB_N
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_OE_N
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_UB_N
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_WE_N
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_ADDR[0]
...
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_ADDR[17]
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_DQ[0]
...
set_instance_assignment -name CYCLONEII_TERMINATION "SERIES 25 OHMS" -to SRAM_DQ[15]
I encountered the same SRAM problems with the ZX Spectrum project where the termination resistors also resolved the problems.
I also patched the 'DE1 Control Panel' binary to fix the anoying 'Quartus version bla bla' message, you can download it here.
Greets G.