On Thu, 28 Feb 2002, Sean Young wrote: > On Wed, Feb 27, 2002 at 04:08:49PM +0000, Richard Atkinson wrote: > > Does anyone have the pinout of the Konami SCC chip, 2212P003 ? I'm trying > > to modify my cartridge to accept an AMD 4Mbit Flash ROM, but I realised I > > don't know where A17 and A18 are. Perhaps someone with a 256K or 512K game > > could trace the connections to those address lines on the ROM socket? > > http://www.msxnet.org/tech/pinouts.txt
Thanks very much for an excellent resource, Sean. Using this information, I made a switchable 4Mbit Flash ROM SCC cartridge using an old King's Valley II PCB. The result can be seen at: http://student.cusu.cam.ac.uk/~rga24/pics/msx/sccflash.jpg It uses two three-position switches for 7 useful permutations and can run 1Mbit, 2Mbit and 4Mbit games at the appropriate boundaries. I have written three Flash ROMs and demonstrated 8 Konami games running on my French NMS8245 setup. The switch positions are as follows: A18 A17 SCC SCC Run 4Mbit game at 00000h 0 SCC Run 2Mbit game at 00000h 1 SCC Run 2Mbit game at 40000h 0 0 Run 1Mbit game at 00000h 0 1 Run 1Mbit game at 20000h 1 0 Run 1Mbit game at 40000h 1 1 Run 1Mbit game at 60000h (for the curious, SCC is switch left as in the photo, 0 is switch right and 1 is switch centre) I have been thinking about adding a ROM disable switch to this cartridge so it can be used with RAM software without removing the Flash ROM, and also installing a ZIF socket. Many thanks to Sean and all those on #msx who helped me with this mod. Richard -- For info, see http://www.stack.nl/~wynke/MSX/listinfo.html
