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added BF mapper, including SC option
added proper fingerprinting for SB mapper
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // This file is part of Gopher2600. | ||
| // | ||
| // Gopher2600 is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // Gopher2600 is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with Gopher2600. If not, see <https://www.gnu.org/licenses/>. | ||
|
|
||
| package cartridge | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/jetsetilly/gopher2600/cartridgeloader" | ||
| "github.com/jetsetilly/gopher2600/environment" | ||
| "github.com/jetsetilly/gopher2600/hardware/memory/cartridge/mapper" | ||
| ) | ||
|
|
||
| // the BF mapper is an concpetual extension of the EF mapper. therefore, it is | ||
| // really just a 256k standard atari cartridge | ||
| type bf struct { | ||
| atari | ||
| } | ||
|
|
||
| // newBF is the preferred method of initialisation for the ef type | ||
| func newBF(env *environment.Environment, loader cartridgeloader.Loader) (mapper.CartMapper, error) { | ||
| data, err := io.ReadAll(loader) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("BF: %w", err) | ||
| } | ||
|
|
||
| cart := &bf{ | ||
| atari: atari{ | ||
| env: env, | ||
| bankSize: 4096, | ||
| mappingID: "BF", | ||
| needsSuperchip: hasEmptyArea(data), | ||
| state: newAtariState(), | ||
| }, | ||
| } | ||
|
|
||
| if len(data) != cart.bankSize*cart.NumBanks() { | ||
| return nil, fmt.Errorf("BF: wrong number of bytes in the cartridge data") | ||
| } | ||
|
|
||
| cart.banks = make([][]uint8, cart.NumBanks()) | ||
| for k := 0; k < cart.NumBanks(); k++ { | ||
| cart.banks[k] = make([]uint8, cart.bankSize) | ||
| offset := k * cart.bankSize | ||
| copy(cart.banks[k], data[offset:offset+cart.bankSize]) | ||
| } | ||
|
|
||
| return cart, nil | ||
| } | ||
|
|
||
| // Snapshot implements the mapper.CartMapper interface. | ||
| func (cart *bf) Snapshot() mapper.CartMapper { | ||
| n := *cart | ||
| n.state = cart.state.Snapshot() | ||
| return &n | ||
| } | ||
|
|
||
| // Plumb implements the mapper.CartMapper interface. | ||
| func (cart *bf) Plumb(env *environment.Environment) { | ||
| cart.env = env | ||
| } | ||
|
|
||
| // Access implements the mapper.CartMapper interface. | ||
| func (cart *bf) Access(addr uint16, peek bool) (uint8, uint8, error) { | ||
| if data, mask, ok := cart.atari.access(addr); ok { | ||
| return data, mask, nil | ||
| } | ||
|
|
||
| if !peek { | ||
| cart.bankswitch(addr) | ||
| } | ||
|
|
||
| return cart.banks[cart.state.bank][addr], mapper.CartDrivenPins, nil | ||
| } | ||
|
|
||
| // AccessVolatile implements the mapper.CartMapper interface. | ||
| func (cart *bf) AccessVolatile(addr uint16, data uint8, poke bool) error { | ||
| if !poke { | ||
| if cart.bankswitch(addr) { | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| return cart.accessVolatile(addr, data, poke) | ||
| } | ||
|
|
||
| // bankswitch on hotspot access. | ||
| func (cart *bf) bankswitch(addr uint16) bool { | ||
| if addr >= 0x0f80 && addr <= 0x0fbf { | ||
| cart.state.bank = int(addr - 0x0f80) | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // Reset implements the mapper.CartMapper interface. | ||
| func (cart *bf) Reset() { | ||
| cart.reset() | ||
| } | ||
|
|
||
| // NumBanks implements the mapper.CartMapper interface. | ||
| func (cart *bf) NumBanks() int { | ||
| return 64 | ||
| } | ||
|
|
||
| // ReadHotspots implements the mapper.CartHotspotsBus interface. | ||
| func (cart *bf) ReadHotspots() map[uint16]mapper.CartHotspotInfo { | ||
| return map[uint16]mapper.CartHotspotInfo{} | ||
| } | ||
|
|
||
| // WriteHotspots implements the mapper.CartHotspotsBus interface. | ||
| func (cart *bf) WriteHotspots() map[uint16]mapper.CartHotspotInfo { | ||
| return cart.ReadHotspots() | ||
| } |