Nowadays, it is relatively easy to make a new Memotech MTX-500, 512 or even RS-128 core.
To give an example, the SVI328 core was born by using 32KB memory banks, not like the native MSX which is 16KB. In the end the ports are different but it is absolutely feasible to make an MTX core with a native rom and it is not as complicated as it seems.
The same thing happens with all the cousins and relatives ranging from the Sord M5 to the MSX.
Sord M5 (Molekula), Adam Computer (alanswx), Sega SC, SG, Memotech MTX, Tatung Einstein (pierco), Spectravideo 318/328(retriovader), and the MSX...
Apart from Z80 and TMS VDP9918/9, some have the audio with a Texas Instruments SN76489 and others with a Yamaha AY-8910 as PSG. There are a lot of software and ported versions between these machines, amazing to try.
For a MTX core, then will come the expansions, the disk controller, the memory, the 80 columns card, to get to the same point we are at. Therefore, the versatility that it offers as a whole is difficult to bring together in a new core, of course, what is there can be improved, but for that we need coders and interested people and there are not many of them.
But think about all the expansion options and how flexible the expanded MTX is as a whole. A delight, thanks to AndyZ and the MiSTer port of retrovader, which in turn has been ported to boards such as MiST, MiSTica, SiDi, NeptUNO, Unamiga Reloaded and Poseidon.
The original design of the Rememotech (core FPGA) is by Andy Key. IF anyone knows MTX well, it is this man.
In the 1980s, Andy Key worked writing Memotech software, including many of the best games, for the Memotech MTX range. His deep knowledge of Memotech software is complemented by a strong understanding of hardware.
Andy has taken advantage of this knowledge to produce a number of improvements to the MTX range, including fantastic software emulation (MEMU) and a number of stunning hardware designs.
"REMEMOTECH is a modern reimplementation of a Memotech MTX / FDX / SDX. It implements enough hardware to allow you to run MTX BASIC, various MTX and CP/M games." The advantage of this type of FPGA core is that they include everything necessary to be able to enjoy the micro from the simple Basic prompt to the most complete CP/M on the hard drive. That's why he said that now that I have been able to thoroughly test all the elements I have a more complete idea of what Memotech was looking for with the MTX500, MTX512 and RS128.
Give that core a chance
Regards