diff options
Diffstat (limited to 'source/mappers.js')
| -rw-r--r-- | source/mappers.js | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/source/mappers.js b/source/mappers.js index 58d979a..bb6ccaf 100644 --- a/source/mappers.js +++ b/source/mappers.js @@ -55,6 +55,22 @@ JSNES.Mappers[0].prototype = { this.regWrite(address, value); } }, + + writelow: function(address, value) { + if (address < 0x2000) { + // Mirroring of RAM: + this.nes.cpu.mem[address & 0x7FF] = value; + } + else if (address > 0x4017) { + this.nes.cpu.mem[address] = value; + } + else if (address > 0x2007 && address < 0x4000) { + this.regWrite(0x2000 + (address & 0x7), value); + } + else { + this.regWrite(address, value); + } + }, load: function(address) { // Wrap around: |