78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package izapple2
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type card interface {
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loadRom(data []uint8)
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assign(a *Apple2, slot int)
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}
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type cardBase struct {
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a *Apple2
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romCsxx *memoryRangeROM
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romC8xx *memoryRangeROM
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romCxxx *memoryRangeROM
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slot int
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_ssr [16]softSwitchR
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_ssw [16]softSwitchW
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_ssrName [16]string
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_sswName [16]string
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}
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func (c *cardBase) loadRom(data []uint8) {
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if c.a != nil {
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panic("Assert failed. Rom must be loaded before inserting the card in the slot")
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}
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if len(data) == 0x100 {
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// Just 256 bytes in Cs00
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c.romCsxx = newMemoryRangeROM(0, data, "Slot ROM")
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} else if len(data) == 0x800 {
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// The file has C800 to C8FF
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// The 256 bytes in Cx00 are copied from the first page in C800
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c.romCsxx = newMemoryRangeROM(0, data, "Slor ROM")
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c.romC8xx = newMemoryRangeROM(0xc800, data, "Slot C8 ROM")
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} else if len(data) == 0x1000 {
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// The file covers the full Cxxx range. Only showing the page
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// corresponding to the slot used.
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c.romCxxx = newMemoryRangeROM(0xc000, data, "Slot ROM")
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} else {
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panic("Invalid ROM size")
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}
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}
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func (c *cardBase) assign(a *Apple2, slot int) {
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c.a = a
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c.slot = slot
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if slot != 0 {
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if c.romCsxx != nil {
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// Relocate to the assigned slot
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c.romCsxx.setBase(uint16(0xc000 + slot*0x100))
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a.mmu.setCardROM(slot, c.romCsxx)
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}
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if c.romC8xx != nil {
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a.mmu.setCardROMExtra(slot, c.romC8xx)
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}
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if c.romCxxx != nil {
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a.mmu.setCardROM(slot, c.romCxxx)
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a.mmu.setCardROMExtra(slot, c.romCxxx)
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}
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}
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for i := 0; i < 0x10; i++ {
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if c._ssr[i] != nil {
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a.io.addSoftSwitchR(uint8(0xC80+slot*0x10+i), c._ssr[i], c._ssrName[i])
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}
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if c._ssw[i] != nil {
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a.io.addSoftSwitchW(uint8(0xC80+slot*0x10+i), c._ssw[i], c._sswName[i])
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}
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}
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}
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func (c *cardBase) addCardSoftSwitchR(address uint8, ss softSwitchR, name string) {
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c._ssr[address] = ss
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c._ssrName[address] = name
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}
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func (c *cardBase) addCardSoftSwitchW(address uint8, ss softSwitchW, name string) {
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c._ssw[address] = ss
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c._sswName[address] = name
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}
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