>From A000H to BFFFH is Option RAM #2 based on figure 3-5 in the 100 Reference >Manual. This would cover the bad RAM. So this looks correct.
If it is a Model 100 the modules were available form Arcade Shopper https://www.arcadeshopper.com/wp/?page_id=11#!/8k-RAM-module-for-Model-100/p/104430801/category=28313042 but they appear to be out of stock. There are a few list contributors who also build 100 modules they might have some built and OSH Park has the PCBs to build your own modules if you want to go down that route for example: https://oshpark.com/shared_projects/V0tpeuMg there are others out there From: M100 <[email protected]<mailto:[email protected]>> on behalf of "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Reply-To: <[email protected]<mailto:[email protected]>> Date: Wednesday, August 21, 2019 at 4:31 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [M100] Need help with bad RAM identification and replacement Can someone verify for me that B000-BFFF would be part of the M7 (Option RAM #2) RAM chip? Of the four RAM chips, this is the second one from the left. Second question is... where can I buy replacement RAM for this? I am good with a soldering iron so I realize I will have to desolder the existing bad RAM and socket it and pop in the new RAM.
