# HG changeset patch # User Paul Boddie # Date 1588107083 -7200 # Node ID 0fa3ae6ff36b1abfaf930e630b50f86157f8705e # Parent 40c8c2cd15f49f90754e26715960135564c45d01 Added a note about the CPU performance limitations of suspending ULA RAM access. diff -r 40c8c2cd15f4 -r 0fa3ae6ff36b ULA.txt --- a/ULA.txt Thu Apr 16 22:25:05 2020 +0200 +++ b/ULA.txt Tue Apr 28 22:51:23 2020 +0200 @@ -1031,6 +1031,12 @@ performance benefit would be derived from giving the CPU full access to the memory bandwidth. +Note that since the CPU is only able to access RAM at 1MHz, there is no +possibility to improve performance beyond that achieved in MODE 4, 5 or 6 +normally. However, if faster RAM access were to be made possible (see the +discussion of 8-bit wide RAM access), the CPU could benefit from freeing up +the ULA's access slots entirely. + The region blanking feature mentioned above could be implemented using this enhancement instead of employing palette blanking for the affected lines of the display.