Yamaha CX5MII/128 Upgrade to MSX2

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By RogueChild

Supporter (1)

RogueChild's picture

09-03-2007, 05:36

Hey guys,

I've just today got my hands on a complete CX5MII/128, and I know there is a simple way to upgrade the CX5MII/128 to MSXII Standard, but EVERY page with the documents has gone under, even cached pages. I've scoured the web for these documents ever since I found out I was getting this computer, but no luck. Does someone happen to have a copy saved? I would appreciate it so much. Now that I actually own an MSX I'll be active on this page, and I'm going to post pics of my machine soon. I know I probably have the crappiest machine on this forum but dammit I'm still proud of it! Anyway, I would really appreciate help here. Thanks guys.

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By HansO

Paladin (672)

HansO's picture

09-03-2007, 08:54

The site where the documents are stored has exceeded its bandwidth limits this month.
It will be back april 1 hopefully.

By legacy

Hero (570)

legacy's picture

09-03-2007, 12:25

You lucky one.Running Naked in a Field of FlowersRunning Naked in a Field of Flowers

By grit

Resident (53)

grit's picture

02-11-2007, 09:14

I'm working on this too, but found that my cx5mII board is different (easier) to upgrade. It's a CX5M II C and the ic sockets are already powered so It's just a matter of plugging them in.

Seems the most difficult thing is to find a - working - HD floppy disk and write a MSDOS image with promprog because winXP doesn't support my eprom burner anymore... I have to image the original CX5MII bios and fit in the MSX2 ROMS....

By shaiwa

Champion (370)

shaiwa's picture

02-11-2007, 09:26

grit, buy an old (486 < ) system/laptop from marktplaats and hook on you eprom burner.
They often come with hd floppy's also.
Most burners work great with a 486dx system.

By Manuel

Ascended (16028)

Manuel's picture

02-11-2007, 18:58

WHy HD floppies?

By [D-Tail]

Ascended (8234)

[D-Tail]'s picture

03-11-2007, 07:47

Manuel: PCs in general use HD floppies. DD floppies are even hard to find!

Although... I recall RemcoZ having several kilograms of DD-disks - he told me on Bussum. Maybe you could contact him?

By grit

Resident (53)

grit's picture

03-11-2007, 08:20

Well I found a few in the attic which could hold the extra 16KB(!) files for a while, so the Eprom part is now finished, but as you might have read in naother thread I now have a little problem in getting the MSX2 subrom mapped at address $0000 instead of $4000.

By Jipe

Paragon (1372)

Jipe's picture

03-11-2007, 16:17

see info on hans otten web page

By grit

Resident (53)

grit's picture

04-11-2007, 15:00

Thanks, I looked through that a bit, I haven't fixed the address part (A14/A15 lines both 0) on the extrom yet, but I found something in the SVI msx2 conversion which I should do on the CX5M too; disable the RTC clock routines because the CX5M-II doesn't have it either. All and all this conversion is completely different from the description you can find on the internet

By Jipe

Paragon (1372)

Jipe's picture

04-11-2007, 22:13

try this link for CX5


the rom without clock exist but you can also reconstruct the RTC clock
on a PCB the place of clock chip are present but not IC and it's easy sold
on other PCB no place for clock chip but you can added a little board with IC

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