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Apr 15, 2017 at 9:00 comment added Miro Kropacek @Thomas: the exact same system is called CompyShop and it matters only if the app/demo/game requires separate ANTIC access, which is mostly never the case.
Apr 15, 2017 at 8:59 comment added Miro Kropacek @BrianH: in 99% cases, yes. Actually, if they state the expansion is CompyShop compatible, then it's 100%.
Mar 21, 2017 at 0:45 comment added Thomas The 130xe has its own bank switch mechanism so you need an expansion that would implement the exact same system.
Mar 21, 2017 at 0:22 comment added Brian H If an Atari program is said to "require 130XE", can you safely assume that program will run on an 800XL or 65XE that has a compatible memory expansion?
Nov 2, 2016 at 20:09 history edited Stephen Kitt CC BY-SA 3.0
PIA port B wasn't available for bank-switching on the Atari 400 and 800.
Apr 20, 2016 at 12:07 history answered Stephen Kitt CC BY-SA 3.0