- Screen Shot 2015-04-15 at 10.55.26 AM.jpg (56.7 KiB) Viewed 11064 times
Here is a simple layout of the ram chips on the 527 board. Start with the pair of RAM chips at location 1 and add them in pairs all the way to 24. if you encounter bad ram chips, remove them and continue filling the chips in order. When trying to get the computer working, you don't need all the ram installed.
The 4 'slot' backplane is divided in two groups of 2. the top 2 slots are powered by one supply, and the bottom 2 slots are powered by the other. Because the 527 board has so much RAM on it, it needs its own supply. You can install the boards in your machine in any order, as long as the 527 is fed by its own supply, so when adding the RAM, put the 540 video board on the bottom, then the 505, just above it, and finally stack the 527 on the top, so you can add ram chips easily. NOTE: When I say "top", I really mean bottom, because the machine is upside-down when open.
Let us know if the screen clears when there is only 2 RAM chips installed, or if the "garbage" on the left of the screen is still present.
Cheers
/Jeff