Should I dump FS-PW1 as well?
Y'es, it could be interesting, as it is slightly different from National FS-4600F firmware.
This is the MW24.ROM dump, there is ROM data in page 1 and 2 and it looks like kanji font in page 2.
Indeed probably non-standard access to the Kanji-ROM, as it seems integrated in the unique ROM of this device.
We need mapper experts to get the full ROM.
Here is FSPW1.ROM and FSPW1KJ.ROM.
Sorry, the kanji ROM may be incorrect (well I used Panasonic FS-A1F to dump so I dumped it's internal KANJI ROM). Will use FS-A1 later today. Although results might be the same
I am not sure you have the full FSPW1 rom, when I compare with FS-4600F firmware. It has probably the same mapper as this firmware.
Yeah I was sure it was not complete, what switch address does the firmware use? (I forgot it seems)
It should be this mapper:
https://github.com/openMSX/openMSX/blob/master/src/memory/Ro...
I re-dumped both, same links as above. Kanji ROM is identical to FS-4600F, FS-5000F2, FS-A1F and FS-A1FM. I dumped the rom with SAVEROM.COM, start address 0, bank size 4000, switch address 6400, 1F number of banks. Not sure if it needs more banks.
Actually, I had already such dumps on my drive. I think they come from Funet. Your dump is 512kB, the Funet dump is 1024kB.