HX-34 memory upgrade

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Por mars2000you

Enlighted (5984)

imagem de mars2000you

29-12-2020, 02:31

Would it be the same for the RAM of the HX-33???

Por popolon_

Master (163)

imagem de popolon_

29-12-2020, 10:30

For HX-33, I would except that the same mapper and same method to add 64k additional memory. There is R12 resistor in same place and switchable (currently connected to +5v). There is also R11 and R13, and those R102/103+R108/109:
Hx33_mainboard_with_switchable_resistors.jpg

Por Manuel

Ascended (18151)

imagem de Manuel

29-12-2020, 11:57

Popolon_, can you also dump the KanjiROM with the KanjiROM.bas program?

Por popolon_

Master (163)

imagem de popolon_

29-12-2020, 12:21

Ok, I can dump it today. Any other rom dump needed? Diskrom?

Por popolon_

Master (163)

imagem de popolon_

29-12-2020, 12:45

@Manuel , the kanji.rom dump can be found from:
https://github.com/popolonx/MSX_STUFF/blob/main/Toshiba_HX34...

Por Manuel

Ascended (18151)

imagem de Manuel

29-12-2020, 13:01

Thanks, looks like it's the same as the HX-32.

Yes, please dump all ROMs, preferably with your programmer.

Por popolon_

Master (163)

imagem de popolon_

29-12-2020, 13:18

That disk rom dump can be made via programmer, as this rom is in socket. However that one ROM (IC9, Kanji rom?) is soldered to mainboard, so I will not risk to break pcb/or rom by unsoldering it (i have desoldering station, but...)

Por popolon_

Master (163)

imagem de popolon_

29-12-2020, 13:56

Por Manuel

Ascended (18151)

imagem de Manuel

29-12-2020, 14:03

Thanks a lot!

Por Manuel

Ascended (18151)

imagem de Manuel

29-12-2020, 23:06

OK, I made a first implementation of the HX-34 in openMSX. The word processor and other ROM works. However, when pressing the COPY button (accessible via the copy_button_pressed setting), the machine seems to hang up after turning on the KANA LED... this needs to be debugged.

About the HX-33: the BASIC/BIOS, SUBROM, RS-232C ROM (page 1 slot 3-3) and the first 16kB of the ROM in page 2 of slot 3-3 are identical. Could we assume the rest of the ROMs are identical? Should be found out.
The only difference between HX-33 and HX-34 seems to be the disk drive. is that correct?

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