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setup.go
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setup.go
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package izapple2
import (
"fmt"
"strconv"
"strings"
"github.com/ivanizag/iz6502"
)
func configure(configuration *configuration) (*Apple2, error) {
var a Apple2
a.Name = configuration.get(confName)
a.mmu = newMemoryManager(&a)
a.video = newVideo(&a)
a.io = newIoC0Page(&a)
a.commandChannel = make(chan command, 100)
// Configure the board
board := configuration.get(confBoard)
a.board = board
err := setupCharactedGenerator(&a, board, configuration.get(confCharRom))
if err != nil {
return nil, err
}
addApple2SoftSwitches(a.io)
switch board {
case "2plus":
a.mmu.initMainRAM()
case "2e":
a.isApple2e = true
a.mmu.initMainRAM()
a.mmu.initExtendedRAM(1)
a.hasLowerCase = true
addApple2ESoftSwitches(a.io)
case "base64a":
a.mmu.initMainRAM()
a.hasLowerCase = true
addBase64aSoftSwitches(a.io)
case "basis108":
memBasis108 := newMemoryRangeBasis108()
videoBasis108 := newVideoBasis108(&a, memBasis108)
a.mmu.initCustomRAM(memBasis108)
a.video = videoBasis108
a.hasLowerCase = true
addBasis108SoftSwitches(a.io, memBasis108, videoBasis108, a.cg)
default:
return nil, fmt.Errorf("board %s not supported it must be '2plus', '2e', 'base64a', 'basis108", board)
}
cpu := configuration.get(confCpu)
switch cpu {
case "6502":
a.cpu = iz6502.NewNMOS6502(a.mmu)
case "65c02":
a.cpu = iz6502.NewCMOS65c02(a.mmu)
}
err = a.loadRom(configuration.get(confRom))
if err != nil {
return nil, err
}
a.setProfiling(configuration.getFlag(confProfile))
a.SetForceCaps(configuration.getFlag(confForceCaps))
err = a.setClockSpeed(configuration.get(confSpeed))
if err != nil {
return nil, err
}
// Add cards on the slots
for i := 0; i < 8; i++ {
cardConfig := configuration.get(fmt.Sprintf("s%v", i))
if cardConfig != "" {
_, err := setupCard(&a, i, cardConfig)
if err != nil {
return nil, err
}
}
}
// Add mods
mods := strings.Split(configuration.get(confMods), ",")
for _, mod := range mods {
switch strings.TrimSpace(mod) {
// case "shift":
// setupShiftedKeyboard(a)
case "four-colors":
// This removes the mod to have 6 colors sent by Wozniak to Byte
// magazine. See: https://archive.org/details/byte-magazine-1979-06/page/n67/mode/2up?view=theater
a.isFourColors = true
}
}
// Add optional accesories including the aux slot
ramWorksSize := configuration.get(confRamworks)
if ramWorksSize != "" && ramWorksSize != "none" {
err = setupRAMWorksCard(&a, ramWorksSize)
if err != nil {
return nil, err
}
}
if configuration.getFlag(confRgb) {
setupRGBCard(&a)
}
nsc := configuration.get(confNsc)
if nsc != "none" && nsc != "" {
err = setupNoSlotClock(&a, nsc)
if err != nil {
return nil, err
}
}
if configuration.getFlag(confRomx) {
err := setupRomX(&a)
if err != nil {
return nil, err
}
}
err = setupTracers(&a, configuration.get(confTrace))
if err != nil {
return nil, err
}
return &a, nil
}
func (a *Apple2) setClockSpeed(speed string) error {
if speed == "full" {
a.cycleDurationNs = 0
} else if speed == "ntsc" {
a.cycleDurationNs = 1000.0 / CPUClockMhz
} else if speed == "pal" {
a.cycleDurationNs = 1000.0 / cpuClockEuroMhz
} else {
clockMhz, err := strconv.ParseFloat(speed, 64)
if err != nil {
return fmt.Errorf("invalid clock speed: %s", speed)
}
a.cycleDurationNs = 1000.0 / clockMhz
}
return nil
}
func (a *Apple2) setProfiling(value bool) {
a.profile = value
}
// SetForceCaps allows the caps state to be toggled at runtime
func (a *Apple2) SetForceCaps(value bool) {
a.forceCaps = value
}
func (a *Apple2) loadRom(filename string) error {
if filename == "<custom>" {
switch a.board {
case "base64a":
return loadBase64aRom(a)
case "basis108":
return loadBasis108Rom(a)
default:
return fmt.Errorf("no custom ROM defined for board %s", a.board)
}
}
data, _, err := LoadResource(filename)
if err != nil {
return err
}
size := len(data)
romBase := 0x10000 - size
a.mmu.physicalROM = newMemoryRangeROM(uint16(romBase), data, "Main ROM")
return nil
}
const pagedRomChipWindowSize = 0x800 // 2 KB
const pagedRomChipCount = 6 // There has to be six ROM chips
const pagedRomWindowSize = pagedRomChipWindowSize * pagedRomChipCount // To cover 0xd000 to 0xffff
func loadMultiPageRom(a *Apple2, filenames []string) error {
if len(filenames) != pagedRomChipCount {
return fmt.Errorf("expected %d ROM files, got %d", pagedRomChipCount, len(filenames))
}
// Load the 6 PROM dumps
proms := make([][]uint8, pagedRomChipCount)
banks := 1
for i, filename := range filenames {
var err error
proms[i], _, err = LoadResource(filename)
if err != nil {
return err
}
pages := len(proms[i]) / pagedRomChipWindowSize
if pages > banks {
banks = pages
}
}
// Init the array of banks
romBanksBytes := make([][]uint8, banks)
for bank := range romBanksBytes {
romBanksBytes[bank] = make([]uint8, 0, pagedRomWindowSize)
}
// Distribute the per chip banks on the full rom banks
for _, romData := range proms {
for bank := range romBanksBytes {
start := (bank * pagedRomChipWindowSize) % len(romData)
romBanksBytes[bank] = append(romBanksBytes[bank], romData[start:start+pagedRomChipWindowSize]...)
}
}
// Create paged ROM
romData := make([]uint8, 0, pagedRomWindowSize*banks)
for _, bank := range romBanksBytes {
romData = append(romData, bank...)
}
rom := newMemoryRangePagedROM(0xd000, romData, "Multipage main ROM", uint8(banks))
// Start with first bank active
rom.setPage(0)
a.mmu.physicalROM = rom
return nil
}
// CreateConfiguredApple is a device independent main. Video, keyboard and speaker won't be defined
func CreateConfiguredApple() (*Apple2, error) {
// Get configuration from defaults and the command line
configuration, filename, err := getConfigurationFromCommandLine()
if err != nil {
return nil, err
}
if filename != "" {
// Try loading as diskette
_, err := LoadDiskette(filename)
isDiskette := err == nil
if isDiskette {
// Let's force a DiskII with the diskette in slot 6
configuration.set(confS6, fmt.Sprintf("diskii,disk1=\"%s\"", filename))
} else {
// Let's force a Smartport card with a block device in slot 7
configuration.set(confS7, fmt.Sprintf("smartport,image1=\"%s\"", filename))
}
}
a, err := configure(configuration)
if err != nil {
return nil, err
}
return a, nil
}