HX-34 memory upgrade

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Door kansaizine

Supporter (13)

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16-09-2010, 18:59

Hi guys,

Recently, I bought Toshiba HX-34 MSX2 computer.
It have 64kb main memory.

I want to upgrade memory up to 128KB but I've no material.
I found empty memory pattern on main board, but I don't know
whether it only have to add memory and capacitor or some
jumper settings are also necessary.


I hope for someone's advice.

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Van Manuel

Ascended (18089)

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16-09-2010, 21:25

Wow, this is a pretty rare MSX outside of Japan!

Van Repair-Bas

Paragon (1115)

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16-09-2010, 21:36

Try first with the memory chips and 2 capacitors (100nF)

Van kansaizine

Supporter (13)

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17-09-2010, 03:10

Thanks manuel, Bas,

I'll try to add memory and capacitors first.
I report when completing it.

Van sd_snatcher

Prophet (3457)

afbeelding van sd_snatcher

17-09-2010, 04:24


Pease dump it's ROMs so the openMSX team can add this machine to their emulator.

Van kansaizine

Supporter (13)

afbeelding van kansaizine

17-09-2010, 04:44

Hi sd_snatcher,

Ok, I'll try to makerom.bas on the real machine.

Van hap

Paragon (2037)

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17-09-2010, 14:34

sd_snatcher, please be more careful making such requests to new forum members, it has a high possibility to be interpreted as unfriendly demands, even if unintentional.

kansaizine, don't feel obliged to go through the hassle of dumping roms and such, I'm sure manuel (openmsx guy) agrees. Welcome to the forum. Smile

Van kansaizine

Supporter (13)

afbeelding van kansaizine

17-09-2010, 15:54

Hi hap,

Thank you for worrying about me.
There's no problem, I also professional of MSX like you guys Tongue
I have the experience of MSX for 24 years and about ten MSX
is owned now. I am happy to contribute to the activity of openmsx.

I'm sorry, I'll try to upgrade memory first. after succeeded it,
next I'll try to run makerom.bas.

I wish to express my gratitude for everyone's consideration.

Van Eugeny_Brychkov

Paragon (1180)

afbeelding van Eugeny_Brychkov

17-09-2010, 19:36

Syunsuke, if you will be adding chips, use sockets so that in case of problems you can easily remove chips from the board. It will also help if you can make hi-res picture of the whole motherboard from both sides and post a link to them here.


Enlighted (5845)

afbeelding van NYYRIKKI

17-09-2010, 19:49

Hmm... Many Japanese MSX2 computers don't have mappers, so test first if the mapper is present:

OUT &HFF,3 -> Crash = Add the chips
OUT &HFF,3 -> No effect = Forget the upgrade

Van RetroTechie

Paragon (1563)

afbeelding van RetroTechie

17-09-2010, 20:35

If it has empty place for ICs, it will probably have a mapper on board too (how else? 2 slots with 64K in each? oO ). Question then becomes whether that mapper is 'enabled' by default, or that you have to change solder bridge / jumper or something like that.

Just out of curiosity: what value does INP(255) return?

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