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Cedric Beust 2020-08-23 14:54:01 -07:00 • committed by Erik C. Thauvin
parent f9a3c4a89a
commit a484b0ee8a
1 changed files with 4 additions and 2 deletions
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6
src/main/kotlin/com/beust/chip8/Ops.kt
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@ -3,8 +3,10 @@ package com.beust.chip8
import kotlin.random.Random
/**
* An Op is made of two bytes which is sliced into four nibbles. These nibbles are then used
* to determine the op and its data.
* An Op is made of two bytes which are sliced into four nibbles. These nibbles are then used
* to determine the op and its data. Bytes get sliced differently depending on the opcode. The base
* class offers some convenience functions to access these nibbles but makes them lazy since ops
* will need different ones and we don't want to do unnecessary work.
*/
sealed class Op(val computer: Computer, val nib: Nibbles) {
protected val nnn by lazy { nib.val3(nib.b1, nib.b2, nib.b3) }