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NT.md

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The NT builds are experimental.

The NT builds of the MOS strip out the Terminal ROM, and replace it with the MOS code previously hidden in one of the other sideways ROM banks. (NT = No Terminal.) Now the MOS code is confined entirely to the MOS ROM and sideways ROM 15, and you can put anything you like in the other banks. This is intended to simplify producing new MegaROM images with alternative utility or language ROMs.

You can get a build from the latest release page: https://github.com/tom-seddon/acorn_mos_disassembly/releases/latest - download the acorn-mos-320nt-350nt zip. Use mos.rom and utils.rom corresponding to the version of interest.

Alternatively, you can build it yourself, following the building instructions. Find the output in the build folder: mos.rom and utils.rom in build/320nt or build/350nt.

(mos.rom and utils.rom are closely related, and cannot be mixed and matched. Both ROMs must come from the exact same build!)

When putting together the new MegaROM image, mos.rom goes in the MOS ROM area, and utils.rom goes in sideways ROM bank 15.

MOS 3.20(NT)

The MOS no longer relies on finding code in the View ROM. You can put anything you like in banks 9-14.

In all other respects this is (supposed to be) identical to MOS 3.20, warts and all. In particular, there are still no sideways RAM utilities built in the MOS.

MOS 3.50(NT)

The MOS no longer relies on finding code in the DFS ROM. You can put anything you like in banks 9-14.

In all other respects this is (supposed to be) identical to MOS 3.50.

Please bear in mind the MOS 3.50 notes if hoping to use the standard MOS 3.50 ROMs for DFS, BASIC, EDIT or ADFS.