53 lines
1.1 KiB
Kotlin
53 lines
1.1 KiB
Kotlin
package android.emu6502
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import java.util.*
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class Memory(private val display: Display) {
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private val mem = IntArray(65536)
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fun get(addr: Int): Int {
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return mem[addr]
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}
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fun getWord(addr: Int): Int {
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return get(addr) + get(addr + 1).shl(8)
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}
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fun set(addr: Int, value: Int) {
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mem[addr] = value
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}
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fun storeByte(addr: Int, value: Int) {
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set(addr, value.and(0xff))
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if (addr >= 0x200 && addr <= 0x5ff) {
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display.updatePixel(addr, mem[addr].and(0x0f))
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}
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}
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// Store keycode in ZP $ff
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fun storeKeypress(keyCode: Int) {
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storeByte(0xff, keyCode)
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}
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fun format(start: Int, length: Int): String {
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var i = 0
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var n: Int
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val dump = StringBuilder()
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while (i < length) {
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if (i.and(15) == 0) {
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if (i > 0) {
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dump.append("\n")
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}
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n = start + i
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dump.append(n.shr(8).and(0xff).toHexString())
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dump.append(n.and(0xff).toHexString())
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dump.append(": ")
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}
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dump.append(get(start + i).toHexString())
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dump.append(" ")
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i++
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}
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return dump.toString().trim()
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}
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}
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