Newbie - Dewoo CPC-400s. Memory prevents running MSX software

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By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

28-10-2004, 04:25

There's no poke that will solve this?

Ah, you are right... No one has yet posted here Universal slot select poke. It does not solve all the problems, but anyway worth of trying, when RAM is in sub-slot:

POKE -1,(15-PEEK(-1)\16)*17

By Sonic_aka_T

Enlighted (4130)

Аватар пользователя Sonic_aka_T

28-10-2004, 11:39

Austin: the idea is that you type that before running some kind of game that won't work otherwise. It won't always help, but there might be some games that will run after that. Ofcourse it doesn't help much if you are playing a game from ROM...

By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

28-10-2004, 17:32

I did some testing with OpenMSX. Gosh, this computer is weird. :-) No MSX logo, No BASIC copyright notices etc. but it has SCREEN 9

Anyway, back to the point. It seems, that you can safely place RAM to slot 3. Disk-ROM seems a lot more problematic. It does not like to work in sub-slot. I anyway managed to get disk drive working in slot 0-2, by copying a better disk ROM from National FS-5500. That way you can get second cartridge port free and you can use expander on that one as well. Good thing is also, that when you have non expanded slot 3, you don't need to worry about wrong sub-slot selections.

Maybe someone can now help you hardware vice (?) I think, that you just need to cut few foils, solder few jumper wires and change new ROM. After that you have an extremely good MSX2.

By cax

Prophet (3738)

Аватар пользователя cax

19-09-2006, 13:44

I just realized that Daewoo machines are pretty widespread in ex-USSR, so by helping owners of such a machine you can boost MSX usage and community growth on this territory...

I get more and more questions from Daewoo owners about how to run at least small ROMs on it.

After some checks I see I can easily run 8K and 16K roms on it (I test on BlueMSX), but 32K ROMs does not work neither via LoadROM, nor with ExecROM.

Can anybody help ?
If I remember correctly, the author of ExecROM is still active. If you read me, please answer !

By the way, magic poke just freezes this machine.

Any advice is welcome !

By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

19-09-2006, 15:39

By the way, magic poke just freezes this machine.That can't be right... Are you sure you used "\" and not "/" ?

If this is right, then RAM must be in some slot 0-X ! Maybe there are different releases of this machine?

By cax

Prophet (3738)

Аватар пользователя cax

19-09-2006, 18:38

NYYRIKKI, I just took this machine config exactly as it appears in BlueMSX and added missing ROMs.
You can do the same and see what happens.

Yes, I used backslash "\" !
And yes, the memory is in extended slot 0 !

By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

19-09-2006, 18:45

Ah, yes sorry... It was 0-2 not 2 Smile I stronly suggest making few hardware changes... You can get the games running with few jump lines but software solution is much harder and need to be implemented to each game. You can try to do the modifications I suggested to emulator and see how well it works after that.

By cax

Prophet (3738)

Аватар пользователя cax

19-09-2006, 18:56

Are you sure the memory layout in this machine is jumper-configurable ?

Also I cannot suggest this solution to each and every user.

You are right, most software won't run on it, but at least 32K ROMs can be run if ROM loading tool will support Daewoo's memory layout, am I right ?

Or maybe it's enough to use some other poke -1 ? If not, please explain.

By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

19-09-2006, 22:54

Are you sure the memory layout in this machine is jumper-configurable ?
No, I meant that cutting some foils and adding few wires should be enough to make this quite normal MSX

You are right, most software won't run on it, but at least 32K ROMs can be run if ROM loading tool will support Daewoo's memory layout, am I right ?
It very much depends of the game code it self. I'll make you a loader so that you can test how well it works.
Or maybe it's enough to use some other poke -1 ? If not, please explain.
No, this POKE is meant for solving the problem that these programs don't do any sub-slot switching at all. These programs can't work as only slot manipulation that actually IS needed in this case is sub-slot switching.

By NYYRIKKI

Enlighted (5938)

Аватар пользователя NYYRIKKI

19-09-2006, 23:32

Ok, I wrote a simple loader and sent it to the email address that I found here. I didn't test it, but I understand that you have a emulator environment where you can test it easyly. It is not a general loader so don't expect it working on other MSX computers.

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