jgrass Posted April 26, 2020 Share Posted April 26, 2020 (edited) Hi, this is my first post here. I recently pulled my 800XL from storage and got it going again. I have been reading this forum for weeks and can't find the answer I am looking for, so please help. This 800XL has the Newell 256K upgrade installed along with a switchable Omniview bios chip. I see there is a pretty cool upgrade out there (Ultimate 1MB) which I am interested in installing, but I would prefer not to remove the Newell upgrade and just add the Ultimate upgrade. Can I do this? Can they coexist peacefully without any memory conflict issues? To be clear, I would not activate the Newell memory with software, just want to leave it installed doing "nothing" and instead use the Ultimate 1MB for additional memory. I see that there are two possible switch installations for the Newell upgrade: 1)Newell says I can install a switch which provides PIA chip pin 15 with two different signal sources to make it look like "other" memory and 2) 3rd party mod says I can put a switch on the Halt line to determine whether Antic will follow either main or banked memory. Will installing either one of these switches help? Perhaps someone can explain to me exactly what they do since it is beyond me. I am good at soldering so I could install either of these or both of these switches or even a different one that could "deactivate" the Newell memory. Thanks! Edited April 26, 2020 by jgrass Also, as a first poster, I see I posted in wrong category. Sorry, can someone move to correct forum location? Quote Link to comment Share on other sites More sharing options...
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