How exactly should it mirror? Block 0 and 1 are BASIC/BIOS, block 2 and 3 are mapped to page 2 and 1 respectively. I thought that is what you meant. So I don't know what is wrong...
Mirroring is probably non-requested (in blueMSX, AX-170 works with the Arabic rom 'normal' 4000-BFFF or mirrored). But without the mirroring, you need to have the rom in the correct order, starting with the AB signature.
Oh my...Another 30-year mistery solved.
The machine has 64KB of ram.
I was following the Expert DD-Plus schematic, and it has the memories wrongly named.
In the schematic, VRAM is RAM and vice-versa.
So, the AX230 has 64K of RAM and a 32K PSRAM chip is being used as video memory.
@Manuel: I'll send you later the more recent dumps.
* The megarom is confirmed in slot 3-3 by SAVEROM
* The 64kB RAM is confirmed in slot 3-0 by SAVEROM
* The Arabic ROM is in the good order from 4000 to BFFF without mirroring in slot 1 (confirmed by full 64kB dump of this slot)
