mirror of https://github.com/irmen/ksim65.git
33 lines
1015 B
Kotlin
33 lines
1015 B
Kotlin
package razorvine.ksim65.components
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import java.io.File
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/**
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* A ROM chip (read-only memory).
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*/
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class Rom(startAddress: Address, endAddress: Address, initialData: Array<UByte>? = null) : MemoryComponent(startAddress, endAddress) {
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override val data: Array<UByte> = initialData?.copyOf() ?: Array(endAddress-startAddress+1) { 0 }
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init {
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require(endAddress-startAddress+1 == data.size) { "rom address range doesn't match size of data bytes" }
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}
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override operator fun get(offset: Int): UByte = data[offset]
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override operator fun set(offset: Int, data: UByte) { /* read-only */ }
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override fun clock() {}
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override fun reset() {}
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/**
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* load a binary program at the given address
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*/
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fun load(filename: String) {
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val bytes = File(filename).readBytes()
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load(bytes)
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}
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fun load(data: Array<UByte>) = data.copyInto(this.data)
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fun load(data: ByteArray) = data.map { (it.toInt() and 255).toShort() }.toTypedArray().copyInto(this.data)
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}
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