>>remove all parts from the ISA card and select a part of it to cut it in the
>>shape of a konami-size-cartridge.
>
>Easier: take any MSX ROM cartridge. No cutting required, looks better too.
Than I should find some lousy MSX cartridge first, to tear apart.
>Actually, is the size of the connector strips the same for MSX and ISA?
Yes, I checked, same spacing on the strips. (So a part of a Vesa Local Bus
card can be used aswell.)
Especially videocards have lots of connector strips on them.
>>make some room (hole) to place the SIMM.
>>isolate the connector pins by removing some of the metal 15 mm. from the
>>beginning of the cartridge to prevent short circuitting with the original
>>wiring of the ISA card.
>>cut 30 little wires of 40 mm.
>>rewire from ISA-pin x to SIMM-pin y
>>rewire from ISA-pin z to SIMM-pin a
>>....etc.
>
>Won't work. Z80 addresses only 64K of RAM. To address more, you need some
>kind of mapper. Examples of mappers are memory mappers (16K pages selected
>via I/O ports) and MegaROM mappers (usually 8K pages selected via memory
>writes).
For that mapper part, I was thinking of some "new cheap components" (if
possible) I know you cannot solder a SIMM directly to your MSX :( And to be
MegaRAM it needs to have 8kb pages, just like all them Brazilian ones.
>The simplest way to get a mapper is to start with a MegaROM cartridge,
>those already have a mapper IC inside. This is the way ESE does it.
>SCC is ideal for this purpose, because after your cartridge is finished,
>you can run Konami SCC games with SCC music.
I know this, but I'm really very attached to my SCC. Don't want to crack the
only one I have open.
>There is another problem with SIMMs: they need a refresh signal. I am not
>sure whether a refresh signal would interfere with the operation of a
>MegaROM cartridge.
Didn't think this one would be a direct problem, it sure makes its design
more complex. Euhmm... refresh in between de MSX clock-cycles, so the MSX
never would have to wait?
Or rip out the PC's video RAM or ?cache?? Most of them don't need a refresh
signal. or just some cheap new parts.
>>Advantages:
>>-anyone could do it (in NL, BR, ES, EE, DK, SE, IT, JP etc.)
>
>This is also true for ESE-SCC: anyone with soldering skill can make it.
>
>>-don't have to make a (complex) PCB design
>
>Also true for ESE-SCC.
>
>>-parts are easy to get hold of
>
>Not true for ESE-SCC: SCC cartridges and SRAM (especially 512K) take a
>little effort to get, but still anyone should be able to do it.
but I love My SCC the way it is. I was hoping on a MegaRAM type of device
(with more than 256kb) with a simple design so that everyone would be able
to make one themselves.
>>Disadvantages:
>>-new MEMMAN routine needed
>
>Is there anyone who is capable and willing to make MEMMAN support MegaRAM
>and ESE-SCC?
I wish I could do something like that.
>>-new Romloader routine needed
>
>Those are easy to make.
>
>>- it would look like SHIT
>
>Once it works, put an audio cassette case around it (same size as MSX
>cartridge) and paint it with a non-transparant paint.
My idea exactly, or put a nice colorfull picture on the inside of the
transparent box.
>Bye,
> Maarten
Bye
Bastiaan���
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