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> Then I discovered that if you put performance-critical code into lower-memory addresses it runs much faster. Do you mean higher memory addresses? Code in th
by chrisdew 10y ago
> Then I discovered that if you put performance-critical code into lower-memory addresses it runs much faster.
Do you mean higher memory addresses?
Code in the lower 16KB of RAM (addresses 16-32KB) has contended memory access with the ULA, which causes the CPU to pause while the TV raster line is drawn.
Code in the upper 32K does not have this issue.