At 10:26 AM 3/19/99 +0100, you wrote:
>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.
Actually, is the size of the connector strips the same for MSX and ISA?
>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).
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.
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.
>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.
>Disadvantages:
>-new MEMMAN routine needed
Is there anyone who is capable and willing to make MEMMAN support MegaRAM
and ESE-SCC?
>-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.
Bye,
Maarten
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