HB-F1XD Japanese MSX2 - Replace V9938 with V9958?

Hero (542)

08-09-2012, 15:24

After using emulation for a while I have taken the plunge into real computing.
Baught a Japanese MSX2 (HB-F1XD) and am wondering if anyone has experience of this machine and could tell me if it is upgradeable.

I'm looking to upgrade the internal memory from 64k to 128k and possibly replace the V9938.

Any help would be appreciated.

By Jipe

Paragon (1603)

08-09-2012, 15:41

Just replace the VDP V9938 by a V9958 is easy

but if you want the basic 3.0 inside is more difficult change the rom

By Colemu

Hero (542)

08-09-2012, 16:05

Do i really need to change the rom, i.e. will a game detect the presence of the V9958 without it?

By jltursan

Prophet (2619)

08-09-2012, 16:09

There's not too much info about the 128KB RAM upgrade for this machine . Seems that the closest upgrade instructions are for the Sony HB-F9S; but I'm not sure at all...

By Jipe

Paragon (1603)

08-09-2012, 16:12

for basic game or basic program use special instruction : screen 10 , scrren 11 , screen 12 , set scroll etc basic 3.0 is required

with a game starting with L.M. command just VDP is required

By Colemu

Hero (542)

08-09-2012, 16:14

I searched all over but couldn't find any info either. I think I'll pull it apart and have a look at the mobo.
Is the V9958 just a straight replacement??

By Colemu

Hero (542)

08-09-2012, 16:26

I do have plenty of 27c256 Eproms and a few programmers if they would enable me to update the Basic from 2 to 3?? Will these suffice? If so, can you chaps point me in the right direction