> > > 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). You're right! Last night, I also got the idea to use MCM's MSXMEM, and those computers have indeed the SAME memory-layout (as described above)! > > 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! > > Ehhh, this memory mapper SIZE is not what does it, is it? You're right again, the size is not what it does... However, I now know what does it: In my 8255 I have a DOS2 built-in. With DOS2 activated, the game doesn't crash at all, also it doesn't matter whether CTRL is pushed or not. I also tried to run the game on my 8235 with a DOS2-cartridge, and naturally the game runs as well... But in the version I have, you can choose the stage you want to play in the beginning, but when you are supposed to progress to the next stage, you start in the same stage again??? > 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) Sorry, I'm not (yet) a programmer... Greetings, See Loy. **** MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/) ****
