As per the JSW version of this too, please see here for JSW!
Two variants are provided, the original I claim nothing for other than turning it into a .pok file. The second is slightly relocated because it is intended for the Software Projects Re-Release.
mm_gfx_fix_bb.pok 369bytes 58 downloads
mm_gfx_fix_sp.pok 378bytes 58 downloads
The following points should probably be noted:
1. The 'workspace' used by the above pok files is actually the same as it is well within the dead-space area, blanked out with a repeating 00/FF pattern on the SP version and containing source code on the BB version. It also sits well outside the boundary limits for a third party character set/font too, so no issues there either!
2. The 'mm_gfx_fix_bb' file is only for the Bug-Byte version!
3. The 'mm_gfx_fix_sp' file is for the Software Projects version and the VentaMatic (Spanish release) and the M.A.D (Mastertronic) releases.