# Internals: The Retro Image

The actual RETRO language is stored as a memory image for Nga.

## Layout

Assuming an Nga built with 524287 cells of memory:

| RANGE           | CONTAINS                     |
| --------------- | ---------------------------- |
| 0 - 1024        | rx kernel                    |
| 1025 - 1535     | token input buffer           |
| 1536 +          | start of heap space          |
| ............... | free memory for your use     |
| 506879          | buffer for string evaluate   |
| 507904          | temporary strings (32 * 512) |
| 524287          | end of memory                |

The buffers at the end of memory will resize when specific
variables related to them are altered.