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| IO Expander | |
|---|---|
| |
| Type | Computer Peripheral |
| Tool | 
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| Stackable | Yes |
| Included in | RedPower |
Crafting[]
Usage[]
IO Expanders are connected to the CPU by Ribbon Cable on one side, and to redstone input and output by Bundled Cable. One side will only connect to Ribbon Cable, and the opposite only to Bundled Cable; the Ribbon Cable side is facing the player when the IO Expander is placed. On the Ribbon Cable side, there is a monochromatic red display; active output bits (but not input ones!) are lit.
The computer can read and set redstone signals for each individual cable colour in the Bundled Cable attached to the IO Expander. Multiple IO Expanders can be used; in this case it becomes necessary to make sure that they have different Redbus IDs. If the same Redbus ID is used, generally only the closest IO Expander with that ID will be functional. To check or change the ID, one must shift-right-click with a Screwdriver or Sonic Screwdriver to reveal the Redbus dialog. The computer can read and write to only one I/O Expander at a time, but they maintain their output states while the computer uses a different one.
FORTH control[]
| Colour | Swatch | Numerical value (2n) | n |
|---|---|---|---|
| White | 1 | 0 | |
| Orange | 2 | 1 | |
| Magenta | 4 | 2 | |
| Light Blue | 8 | 3 | |
| Yellow | 16 | 4 | |
| Lime | 32 | 5 | |
| Pink | 64 | 6 | |
| Gray | 128 | 7 | |
| Light Gray | 256 | 8 | |
| Cyan | 512 | 9 | |
| Purple | 1024 | 10 | |
| Blue | 2048 | 11 | |
| Brown | 4096 | 12 | |
| Green | 8192 | 13 | |
| Red | 16384 | 14 | |
| Black | 32768 | 15 |
The redstone state of each colour of redwire can be read and set. The state is read or set as a single unsigned integer, with each colour of redwire corresponding to one bit in that integer (the nth bit of the integer). In other words, the value of the integer is the sum of the values of the active colours, as illustrated in the adjacent table.
FORTH IO commands and variables[]
- IOX!
- Sets the IO output to the top number in the stack. Note that there is no space between "IOX" and "!".
- Example:
11 IOX!
Turns on the white, orange and light blue wires, turns off the rest - IOX@
- Returns the integer corresponding to connected active wires. Note that an active output to some coloured wire will cause an active input for that colour, if a wire of that colour is connected. Note that there is no space between "IOX" and "@".
- Example:
IOX@ U.
Prints the number corresponding to the input as an unsigned integer - IOXSET
- Sets to active wires corresponding to the top number in the stack; wires without bits active in that integer will not be set or reset.
- Example:
11 IOXSET
Turns on the white, orange and light blue wires, ignores the rest - IOXRST
- Resets to inactive wires corresponding to the top number in the stack; wires without bits active in that integer will not be set or reset.
- Example:
11 IOXRST
Turns off the white, orange and light blue wires, ignores the rest - IOXADDR
- This is a variable; it sets the control for I/O to the IO Expander with the Redbus ID to which it is set. To change it, use
IOXADDR !to set it to the top number in the stack. To retrieve it, useIOXADDR @. IOXADDR on its own will return the memory address where it is stored, which is generally not useful. - Example:
11 IOXADDR !
Turns control and input to the IO Expander with Redbus ID 11
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