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@@ -18,6 +18,10 @@ In Position Mode, the computer's default setting, parameters passed to functions
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In Immediate Mode, the parameter is taken "as is", and operated on accordingly. For example, `42` in Immediate Mode is treated as `42`.
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+### Relative Mode
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+
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+Relative mode acts similarly to Position Mode, where the final value is retrieved from another location in memory. It's different, though, in that a "Relative Base Offset" is added to that memory address to get the true address. The Relative Base Offset value is tracked by the computer's memory stack.
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+
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## Opcode Dictionary
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* [01 - ADD](#01---add)
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@@ -28,6 +32,7 @@ In Immediate Mode, the parameter is taken "as is", and operated on accordingly.
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* [06 - JUMP IF FALSE](#06---jump-if-false)
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* [07 - LESS THAN](#07---less-than)
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* [08 - EQUALS](#08---equals)
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+* [09 - MODIFY RELATIVE BASE](#09---modify-relative-base)
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* [99 - HALT](#99---halt)
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### 01 - ADD
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@@ -76,12 +81,14 @@ Takes input from either the runtime input array, or from the console, depending
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If the input is set to come from the runtime input array, and the array is empty, the computer will _pause_ execution until either the `Run` function for the `Input` functions are called on the computer.
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-The output position is always used in Immediate Mode.
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+The output position may be in either Immediate Mode or Relative Mode.
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| Forms | Description |
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| ----- | ----------- |
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| 3 | Receive input |
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| 03 | Receive input |
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+| 103 | Receive input in Immediate Mode |
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+| 203 | Receive input in Relative Mode |
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| Parameters | Description |
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| ---------------- | ----------- |
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@@ -111,6 +118,14 @@ If the computer has an `outputComputer` set, then the output is instead sent to
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### 08 - EQUALS
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+### 09 - MODIFY RELATIVE BASE
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+
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+Takes one parameter as input, and adds that number to the stack's Relative Base Offset. This value may be either a positive or negative integer.
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+
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+| Parameters | Description |
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+| ---------------- | ----------- |
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+| Operand 1 | The number, or memory address of the number, to add to the Relative Base Offset |
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+
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### 99 - HALT
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A simple instruction with no parameters. Stops the computer from running any more instructions.
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