83 lines
1.6 KiB
Go
83 lines
1.6 KiB
Go
package cards
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import (
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"fmt"
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)
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type FirmwareCard struct {
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name string
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rom [12288]byte
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cm CardManager
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slot byte
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}
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func NewFirmwareCard(rom []byte, name string, slot byte, cm CardManager) (*FirmwareCard, error) {
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if len(rom) != 12288 {
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return nil, fmt.Errorf("Wrong size ROM: expected 12288, got %d", len(rom))
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}
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fc := &FirmwareCard{name: name, cm: cm, slot: slot}
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copy(fc.rom[:], rom)
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return fc, nil
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}
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func (fc *FirmwareCard) String() string {
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return fmt.Sprintf("%s (slot %d)", fc.name, fc.slot)
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}
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func (fc *FirmwareCard) Init() {
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}
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func (fc *FirmwareCard) Slot() byte {
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return fc.slot
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}
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func (fc *FirmwareCard) ROMDisabled() {
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// Firmware card doesn't have a $C(8-F)xx ROM
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}
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func (fc *FirmwareCard) handleAccess(address byte) {
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if address%2 == 1 {
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// Card off
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fc.cm.HandleROM(false, fc.slot)
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} else {
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// Card on
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fc.cm.HandleROM(true, fc.slot)
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}
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}
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func (fc *FirmwareCard) Read16(address byte) byte {
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fc.handleAccess(address)
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return fc.cm.EmptyRead()
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}
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func (fc *FirmwareCard) Write16(address byte, value byte) {
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fc.handleAccess(address)
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}
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func (fc *FirmwareCard) Read(address uint16) byte {
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if address < 0xD000 {
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panic(fmt.Sprintf("%s got read to $%04X (<$D000)", fc.String(), address))
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}
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return fc.rom[address-0xD000]
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}
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func (fc *FirmwareCard) Write(address uint16, value byte) {
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// Firmware is ROM: do nothing
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}
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func (fc *FirmwareCard) Read256(address byte) byte {
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return fc.cm.EmptyRead()
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}
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func (fc *FirmwareCard) Write256(address byte, value byte) {
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// Firmware is ROM: do nothing
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}
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func (fc *FirmwareCard) WantTicker() bool {
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return false
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}
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func (fc *FirmwareCard) Tick() {
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// do nothing
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}
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