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mamory.js
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const { byte, uint16 } = require("./utils")
module.exports.MirrorHorizontal = 0
module.exports.MirrorVertical = 1
module.exports.MirrorSingle0 = 2
module.exports.MirrorSingle1 = 3
module.exports.MirrorFour = 4
module.exports.MirrorLookup = [
[uint16(0), uint16(0), uint16(1), uint16(1)],
[uint16(0), uint16(1), uint16(0), uint16(1)],
[uint16(0), uint16(0), uint16(0), uint16(0)],
[uint16(1), uint16(1), uint16(1), uint16(1)],
[uint16(0), uint16(1), uint16(2), uint16(3)],
]
function MirrorAddress(mode, adr) {
const address = (uint16(adr) - 0x2000) % 0x1000
const table = Math.floor(address / 0x0400)
const offset = address % 0x0400
let m = uint16(0x2000 + (module.exports.MirrorLookup[byte(mode)][table] * 0x0400) + offset)
console.log(":mmmm:", adr, address, table, offset, (module.exports.MirrorLookup[byte(mode)][table] * 0x0400), m)
return m;
}
module.exports.CPUMemory = class CPUMemory {
constructor(console) {
this.console = console
}
read(address) {
switch (true) {
case uint16(address) < 0x2000:
console.log(":11:", address)
return byte(this.console.RAM[address % 0x0800])
case uint16(address) < 0x4000:
console.log(":22:", address)
const m = this.console.PPU.readRegister(0x2000 + address % 8)
console.log(":222:", m)
// console.log(":222:", this.console.CPU.PC, this.console.CPU.SP, this.console.CPU.A, this.console.CPU.X, this.console.CPU.Y, this.console.CPU.C, this.console.CPU.Z, this.console.CPU.I, this.console.CPU.D, this.console.CPU.B, this.console.CPU.U, this.console.CPU.V, this.console.CPU.N)
return byte(m)
break
case uint16(address) == 0x4014:
console.log(":33:", address)
return byte(this.console.PPU.readRegister(address))
break
case uint16(address) == 0x4015:
console.log("::", address)
// return this.console.APU.readRegister(address)
break
case uint16(address) == 0x4016:
console.log("::", address)
// return this.console.Controller1.read()
break
case uint16(address) == 0x4017:
console.log("::", address)
// return this.console.Controller2.read()
break
case uint16(address) < 0x6000:
console.log("::", address)
// TODO: I/O registers
break
case uint16(address) >= 0x6000:
console.log(":44:", address)
// console.log("....", this.console.Mapper)
return byte(this.console.Mapper.read(address))
default:
console.error("unhandled cpu memory read at address: 0x%04X", address.x())
}
return byte(0)
}
write(address, val) {
// console.log(address.x(), "<<<||")
let value = byte(val)
switch (true) {
case uint16(address) < 0x2000:
console.log(":55:", address)
this.console.RAM[address % 0x0800] = value
break
case uint16(address) < 0x4000:
console.log(":66:", address)
this.console.PPU.writeRegister(0x2000 + address % 8, value)
break
case uint16(address) < 0x4014:
console.log("::", address)
// this.console.APU.writeRegister(address, value)
break
case uint16(address) == 0x4014:
console.log(":77:", address)
this.console.PPU.writeRegister(address, value)
break
case uint16(address) == 0x4015:
console.log("::", address)
// this.console.APU.writeRegister(address, value)
break
case uint16(address) == 0x4016:
console.log("::", address)
// this.console.Controller1.write(value)
// this.console.Controller2.write(value)
break
case uint16(address) == 0x4017:
console.log("::", address)
// this.console.APU.writeRegister(address, value)
break
case uint16(address) < 0x6000:
console.log("::", address)
// TODO: I/O registers
break
case uint16(address) >= 0x6000:
console.log(":999:", address)
this.console.Mapper.write(address, value)
break
default:
console.error("unhandled cpu memory write at address: 0x%04X", address)
}
}
}
module.exports.PPUMemory = class PPUMemory {
constructor(console) {
this.console = console
}
read(adr) {
const address = uint16(adr) % 0x4000
switch (true) {
case uint16(address) < 0x2000:
console.log(":m:", address)
return byte(this.console.Mapper.read(address))
case uint16(address) < 0x3F00:
const mode = this.console.Cart.mirror
let m = byte(this.console.PPU.nameTableData[MirrorAddress(mode, address) % 2048])
console.log(":mm:", adr, address, mode, m, MirrorAddress(mode, address), MirrorAddress(mode, address) % 2048)
return m
case uint16(address) < 0x4000:
console.log(":mmm:", address)
return byte(this.console.PPU.readPalette(address % 32))
default:
console.error("unhandled ppu memory read at address: 0x%04X", address)
}
return byte(0)
}
write(adr, val) {
const address = uint16(adr) % 0x4000
let value = byte(val)
switch (true) {
case uint16(address) < 0x2000:
console.log(":n:", address)
this.console.Mapper.write(address, byte(value))
break
case uint16(address) < 0x3F00:
console.log(":nn:", address)
const mode = this.console.Cart.mirror
this.console.PPU.nameTableData[MirrorAddress(mode, address) % 2048] = byte(value)
break
case uint16(address) < 0x4000:
console.log(":nnn:", address)
this.console.PPU.writePalette(address % 32, byte(value))
break
default:
console.error("unhandled ppu memory write at address: 0x%04X", address)
}
}
}