Author
| Yamaha CX5MII/128 Upgrade to MSX2
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RogueChild
msx friend
Posts: 1 |  Posted: March 09 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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HansO
msx addict
Posts: 375 | Posted: March 09 2007, 08:54 |
The site where the documents are stored has exceeded its bandwidth limits this month.
It will be back april 1 hopefully.
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legacy
msx professional
Posts: 516 | Posted: March 09 2007, 12:25 |
You lucky one.  |
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grit
msx novice
Posts: 25 | Posted: November 02 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....
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shaiwa
msx addict
Posts: 287 | Posted: November 02 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.
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manuel
msx guru
Posts: 3545 | Posted: November 02 2007, 18:58 |
WHy HD floppies?
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[D-Tail]
msx guru
Posts: 3020 | Posted: November 03 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? |
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grit
msx novice
Posts: 25 | Posted: November 03 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.
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Jipe
msx freak
Posts: 205 | Posted: November 03 2007, 16:17 |
see info on hans otten web page
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grit
msx novice
Posts: 25 | Posted: November 04 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
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Jipe
msx freak
Posts: 205 | Posted: November 04 2007, 22:13 |
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grit
msx novice
Posts: 25 | Posted: November 05 2007, 09:35 |
Yes, this is the link I mean, my mainboard s is nothing like the mainboard on my CX5M-II service manual or on this link. My board says xb300 and has all videoram on he mainboard itself. I can't see RTC space on that board either.
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Jipe
msx freak
Posts: 205 | Posted: November 05 2007, 11:25 |
the schematic is the same only RTC miss
how many size as your video ram and how many IC
if is 16 ko you desold all IC and sold 2 x Ram 64k x 4 but is not same pinout
you can make a little board or sold on PCB with wire
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grit
msx novice
Posts: 25 | Posted: November 05 2007, 19:09 |
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Jipe
msx freak
Posts: 205 | Posted: November 05 2007, 23:29 |
my CX5MII is not the same but i have a friend with a CX5MII with this vram
i conctact for saturday and take many photos with the modification
i have added a clock on additional PCB and 4Mo memory
but i have no schematic and no photo
the clock of CX5MII is the same of VG8235
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