Hi again!
"See Loy Lin" <[EMAIL PROTECTED]> wrote:
> > > > Yeah, I got this problem once. In a MSX2. But DD2 runs fine in my
> > > > MSX1, my MSX2 and my TR-GT. Even in BrMSX, VMSX and CJS MSX2 Emulator
> > > > (not in fMSX).
> > > On my Philips VG8235 and NMS 8245 (both MSX2) exactly the same
> > > happened, but now I have a Philips NMS 8255 (MSX2 and with 512 Kb
> > > RAM) and the game works perfectly with it!
> >
> > Can you, please, tell me the memory map (RAM slot/subslot) and VDP
> > ports of your VG8235/NMS8245 and NMS8255? I'm curious about this crash of
> > DD2...
>
> I'm afraid I don't know much about the memory structure of my MSX...
> However, I will try to look at home for documentation, but has
> anyone more knowledge about this subject???
These MSX-2 models from Philips (and the 8280 also) basically share
the same memory layout:
BIOS/BASIC ROM in slot 0,
slot 1 & 2 are the same numbered cartridge-slots,
and slot 3 is internally expanded (giving 3-0, 3-1, 3-2 and 3-3),
with:
128 KB. memory mapper (8 blocks of 16 KB. each) in slot 3-2,
MSX2 subROM in slot 3-0 (address 0000-3FFFh), and
diskROM in slot 3-3 (address 4000-7FFFh)
You can discover such features easily using some debugging utility,
or run MCCM's MSXMEM (it's pre-historic, but still good for this).
> > > happened, but now I have a Philips NMS 8255 (MSX2 and with 512
> > > Kb RAM) and the game works perfectly with it!
Ehhh, this memory mapper SIZE is not what does it, is it?
The VDP ports are 'ofcourse' the same as in any other MSX:
98h: read/write VRAM
99h: read: VDP status, write: VDP commands/register changing
These can also be found in BIOS-addresses 0006/0007, as any MSX
programmer should know (stupid...you can find this anywhere)
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
http://www.twente.nl/~cce/index.htm (Computerclub Enschede)
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