izapple2/cardBase.go
2020-03-08 23:39:25 +01:00

89 lines
2.0 KiB
Go

package apple2
import (
"io"
)
type card interface {
loadRom(data []uint8)
assign(a *Apple2, slot int)
persistent
}
type cardBase struct {
a *Apple2
romCsxx *memoryRange
romC8xx *memoryRange
romCxxx *memoryRange
slot int
_ssr [16]softSwitchR
_ssw [16]softSwitchW
_ssrName [16]string
_sswName [16]string
}
func (c *cardBase) loadRom(data []uint8) {
if c.a != nil {
panic("Assert failed. Rom must be loaded before inserting the card in the slot")
}
if len(data) == 0x100 {
// Just 256 bytes in Cs00
c.romCsxx = newMemoryRange(0, data)
} else if len(data) == 0x800 {
// The file has C800 to C8FF
// The 256 bytes in Cx00 are copied from the first page in C800
c.romCsxx = newMemoryRange(0, data)
c.romC8xx = newMemoryRange(0xc800, data)
} else if len(data) == 0x1000 {
// The file covers the full Cxxx range. Only showing the page
// corresponding to the slot used.
c.romCxxx = newMemoryRange(0xc000, data)
} else {
panic("Invalid ROM size")
}
}
func (c *cardBase) assign(a *Apple2, slot int) {
c.a = a
c.slot = slot
if slot != 0 {
if c.romCsxx != nil {
// Relocate to the assigned slot
c.romCsxx.base = uint16(0xc000 + slot*0x100)
a.mmu.setCardROM(slot, c.romCsxx)
}
if c.romC8xx != nil {
a.mmu.setCardROMExtra(slot, c.romC8xx)
}
if c.romCxxx != nil {
a.mmu.setCardROM(slot, c.romCxxx)
a.mmu.setCardROMExtra(slot, c.romCxxx)
}
}
for i := 0; i < 0x10; i++ {
a.io.addSoftSwitchR(uint8(0xC80+slot*0x10+i), c._ssr[i], c._ssrName[i])
a.io.addSoftSwitchW(uint8(0xC80+slot*0x10+i), c._ssw[i], c._sswName[i])
}
}
func (c *cardBase) addCardSoftSwitchR(address uint8, ss softSwitchR, name string) {
c._ssr[address] = ss
c._ssrName[address] = name
}
func (c *cardBase) addCardSoftSwitchW(address uint8, ss softSwitchW, name string) {
c._ssw[address] = ss
c._sswName[address] = name
}
func (c *cardBase) save(w io.Writer) error {
// Empty
return nil
}
func (c *cardBase) load(r io.Reader) error {
// Empty
return nil
}