During my short time playing with 30-40 year old machines, I keep running into different DRAM chips that may be the same as others, but it is sometimes difficult to find data sheets on some of these. My most recent example is a Quadram Quadboard ram expansion board that I picked up from eBay. The board came full of Motorola MCM6665BP-20 16 pin chips. I have driven myself and Duck-Duck-Go slightly nuts trying to find a data sheet for them. I did succeed in finding MCM6665A, which has the same pinout as a HM4716A.
After I repair the slight damage caused by the "VARTA - most hated brand of battery ever", I want to test the chips prior to sticking the board in my working XT. It would be nice if someone had a cross reference that said that "this" chip is the same as "that" one.
Is there a list hidden somewhere that would be helpful?
After I repair the slight damage caused by the "VARTA - most hated brand of battery ever", I want to test the chips prior to sticking the board in my working XT. It would be nice if someone had a cross reference that said that "this" chip is the same as "that" one.
Is there a list hidden somewhere that would be helpful?