The Blink-RAM is v2 of our 4MB RAM SIMM. This version is now a 4 layer board for less interference between the traces and layers. But HOLD on, why is it Blink-Ram? Well, we have added an attiny on the back along with 2 LEDs (Red & Blue) that is tied into the RW signal of the chips. As data is written, the LEDs will blink. Custom colors can be ordered so please communicate directly with me. CayMacVintage@gmail.com I have recently used this to aid me in solving an issue on a SE30 board and being able to see that the RAM was getting power and communicating was very helpful. NOTE: On a SE30, only bank 0 will blink. The RAM is sold as per SIMM so you can pick how many SIMM sticks you want. You can buy each SIMM with the LED option or without the LED option. Is your choice how you want to mix them up. Maybe you want all 4 SIMMS to be LED to get maximum blinking. Reminder that some machines need minimum of 2 equal size SIMMs or 4 equal size SIMMs.