Editing Atari TT030 (section)

== Memory ==

The TT030 features two distinct types of RAM:

* '''ST-RAM''' (also called "dual-purpose" RAM): 2 MB soldered, expandable to 10 MB. This memory is shared between the CPU, DMA controller, and video subsystem. It is accessible by all system components, including the ST-compatible peripheral chips, and occupies the lower 16 MB address space.
* '''TT-RAM''' (also called "single-purpose" or "fast" RAM): Installed on a daughter board using either 30-pin or 72-pin SIMMs, expandable up to 256 MB. TT-RAM is accessible only by the 68030 CPU and FPU, running at full bus speed without contention from the video or DMA subsystems.

The memory control unit (MCU) manages both RAM types. TT-RAM is significantly faster for CPU-bound operations because it does not share bandwidth with the video shifter.