Difference between revisions of "83Plus:Ports:01"
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The key map is laid out as follows: | The key map is laid out as follows: | ||
| − | <nowiki> | + | <nowiki> Group Bit -> 0 1 2 3 4 5 6 7 |
| − | + | Group Mask -> FE FD FB F7 EF DF BF 7F | |
Key Bit (Mask) | Key Bit (Mask) | ||
| − | 0 (FE) | + | 0 (FE) | DOWN|ENTER| (-) | . | 0 | |GRAPH| | |
| − | 1 (FD) | + | 1 (FD) | LEFT| + | 3 | 2 | 1 | STO |TRACE| | |
| − | 2 (FB) | + | 2 (FB) |RIGHT| - | 6 | 5 | 4 | LN |ZOOM | | |
| − | 3 (F7) | + | 3 (F7) | UP | * | 9 | 8 | 7 | LOG |WIND | | |
| − | 4 (EF) | + | 4 (EF) | | / | ) | ( | , | x^2 | Y= | | |
| − | 5 (DF) | + | 5 (DF) | | ^ | TAN | COS | SIN |x^-1 | 2nd | | |
| − | 6 (BF) | + | 6 (BF) | |CLEAR|VARS |PRGM |APPS |MATH |MODE | | |
| − | 7 (7F) | + | 7 (7F) | | | |STAT |X,T..|ALPHA| DEL | |</nowiki> |
| − | + | * '''Note:''' Group FB Key FE is NEGATE, not to be confused with SUBTRACT. | |
| − | + | * '''Note:''' Group DF Key FE could be ON, but the ON key is tested elsewhere (a "special case" key - after all, it is the ON key). | |
| − | + | * '''Note:''' Group EF Key BF (APPS) is called MATRIX on the TI-83. | |
== Example == | == Example == | ||
Revision as of 09:52, 27 March 2005
Synopsis
Port Number: 01h
Function: Keyboard Port
This port controls the on-calc keypad. The keypad is divided into a series of groups.
Read Values
- Bits are set according whether corresponding keys from selected groups are pressed. Groups are selected through writing to the port. A pressed key reads a 0 bit. An unpressed key reads a 1 bit. The port reads FF after a reset (write FF).
Write Values
- $FF : Reset the keypad. This unselects all groups and resets the keypad state.
- Anything else : Any 0 bit adds the corresponding group to the list of monitored groups. When a key in a monitored group is pressed, the corresponding key bit reads 1.
Comments
The key map is laid out as follows:
Group Bit -> 0 1 2 3 4 5 6 7
Group Mask -> FE FD FB F7 EF DF BF 7F
Key Bit (Mask)
0 (FE) | DOWN|ENTER| (-) | . | 0 | |GRAPH| |
1 (FD) | LEFT| + | 3 | 2 | 1 | STO |TRACE| |
2 (FB) |RIGHT| - | 6 | 5 | 4 | LN |ZOOM | |
3 (F7) | UP | * | 9 | 8 | 7 | LOG |WIND | |
4 (EF) | | / | ) | ( | , | x^2 | Y= | |
5 (DF) | | ^ | TAN | COS | SIN |x^-1 | 2nd | |
6 (BF) | |CLEAR|VARS |PRGM |APPS |MATH |MODE | |
7 (7F) | | | |STAT |X,T..|ALPHA| DEL | |
- Note: Group FB Key FE is NEGATE, not to be confused with SUBTRACT.
- Note: Group DF Key FE could be ON, but the ON key is tested elsewhere (a "special case" key - after all, it is the ON key).
- Note: Group EF Key BF (APPS) is called MATRIX on the TI-83.
Example
ld a, 0FFh ;Reset the keypad. out (1), a ld a, 0FEh ;Select group 0. out (1), a in a, (1) ;Test for keys. and 0FDh ;Test for Left Arrow key by making A 0 if left was pressed. call z, LeftArrowPressed ;If 0 then left was pressed. ld a, 0FFh ;Reset the keypad. out (1), a
