Remove nes implementation so that we can implement it in a better way from scratch.

src/system/nes/mapper/axrom.zig

@@ -1,64 +0,0 @@
-const types = @import("types.zig");
-const Mirroring = types.Mirroring;
-
-const Axrom = @This();
-
-prg_bank_select: u8 = 0,
-mirroring_select: u1 = 0,
-prg_bank_count: usize,
-
-pub fn init(
-    prg_size: usize,
-) Axrom {
-    return .{
-        .prg_bank_count = prg_size / 0x8000,
-    };
-}
-
-pub fn cpuMapRead(
-    self: *const Axrom,
-    address: u16,
-) ?usize {
-    if (address < 0x8000) return null;
-
-    const offset = @as(usize, address - 0x8000);
-    const bank = @as(usize, self.prg_bank_select & 0x07) % self.prg_bank_count;
-    return bank * 0x8000 + offset;
-}
-
-pub fn cpuWrite(
-    self: *Axrom,
-    address: u16,
-    value: u8,
-) void {
-    if (address >= 0x8000) {
-        self.prg_bank_select = value & 0x07;
-        self.mirroring_select = @truncate((value >> 4) & 1);
-    }
-}
-
-pub fn ppuMapRead(
-    _: *const Axrom,
-    address: u16,
-) ?usize {
-    if (address >= 0x2000) return null;
-    return address;
-}
-
-pub fn ppuMapWrite(
-    _: *const Axrom,
-    address: u16,
-) ?usize {
-    if (address >= 0x2000) return null;
-    return address;
-}
-
-pub fn mirroring(
-    self: *const Axrom,
-) Mirroring {
-    return if (self.mirroring_select == 0) .single_screen_lower else .single_screen_upper;
-}
-
-pub fn irqAsserted(_: *const Axrom) bool {
-    return false;
-}