Robin Sergeant

rm/rm380z.cpp: Use real character ROM for COS 4.0, correct screen resolution and add support for user defined characters

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I've managed to obtain a dump of the real character ROM for COS 4.0 courtesy of the Research Machines user group, and this PR pulls this in and updates the...

rm/rm380z.cpp: Add support for 4-line and backwards hw scrolling

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Previously only full screen scrolling was supported in one direction, and even this went a little haywire with CP/M paging, e.g. when listing the contents of a disk with more...

rm/rm380z.cpp: Add COS 4.0/F firmware

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This PR adds support for COS 4.0/F, new romset attached below: [rm380zf.zip](https://github.com/mamedev/mame/files/14812260/rm380zf.zip) It's basically the same as COS 4.0/M, but with some differences in the FDC code (no motor control...

This PR adds a new driver to replace the non working 480Z fragments in the 380Z driver. As the hardware is so different I think it really belongs in a...