WikiTI - User contributions [en]

83Plus:Ports:01

2005-03-27T22:50:40Z

69.242.210.167: /* Synopsis */ Tried to clarify a little bit. ("control")

== Synopsis ==
'''Port Number:''' 01h

'''Function:''' Keyboard Port

This port reads key presses from the 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:

<nowiki> 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 | |</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 ==
<nowiki>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</nowiki>

83Plus:BCALLs:4A6B

2005-03-25T18:50:56Z

69.242.210.167: /* Synopsis */ Changed 0042 to 4A6B. What was 0042?

== Synopsis ==
'''Official Name:''' RclKey

'''Other Names:''' RclKeyRtn

'''BCALL Address:''' 4A6B

Sets up the monitor vectors for Rcl mode.

=== Inputs ===
''None''

=== Outputs ===
''None''

=== Registers Destroyed ===
''Unknown''

== Comments ==
This routine copies the current monitor vectors to [[83Plus:RAM:859B|cxPrev]], and sets up the monitor vectors for the Rcl handler.

83Plus:BCALLs:4A65

2005-03-25T18:49:14Z

69.242.210.167: /* Comments */ Not ironic :)

== Synopsis ==
'''Official Name:''' ZIfRclHandler

'''BCALL Address:''' 4A65h

Returns whether or not a Rcl handler (the function that occurs when you press 2nd+Rcl) is currently active.

=== Inputs ===
''None''

=== Outputs ===
* Zero Flag: Set if Rcl handler is active, reset otherwise.

=== Registers Destroyed ===
* DE, HL

== Comments ==
This B_CALL works by simply comparing the address of [[83Plus:RAM:858D|cxMain]] to whatever it should be when the Rcl handler is active. [[83Plus:RAM:8599|cxPage]] is not checked.

83Plus:BCALLs:4A65

2005-03-25T18:48:44Z

69.242.210.167: /* Registers Destroyed */ DE, HL

83Plus:BCALLs:44E6

2005-03-25T18:47:40Z

69.242.210.167: /* Outputs */ HL and DE -> null terminators

== Synopsis ==
'''Official Name:''' StrCat

'''BCALL Address:''' 44E6

Concatenates (joins) the string pointed by HL to the end of the string pointed pointed by DE.

=== Inputs ===
* DE: String to join to
* HL: String to copy

=== Outputs ===
* DE: points to null terminator of concatenated string
* HL: points to null terminator of original string to be concatenated

=== Registers Destroyed ===
* AF

== Comments ==
This B_CALL is the same as the standard C function strcat.

83Plus:BCALLs:44E6

2005-03-25T18:46:44Z

69.242.210.167: /* Registers Destroyed */ AF

== Synopsis ==
'''Official Name:''' StrCat

'''BCALL Address:''' 44E6

Concatenates (joins) the string pointed by HL to the end of the string pointed pointed by DE.

=== Inputs ===
* DE: String to join to
* HL: String to copy

=== Outputs ===
''None''

=== Registers Destroyed ===
* AF

== Comments ==
This B_CALL is the same as the standard C function strcat.

83Plus:BCALLs:44E3

2005-03-25T18:45:29Z

69.242.210.167: /* Outputs */ DE, HL -> null terminators

== Synopsis ==
'''Official Name:''' StrCpy

'''BCALL Address:''' 44E3

Copies a null-terminated string from one location to another.

=== Inputs ===
* DE: address to copy the string to
* HL: string to copy

=== Outputs ===
* DE: points to null terminator of destination string
* HL: points to null terminator of source string

=== Registers Destroyed ===
* AF

== Comments ==
This B_CALL is basically the same as the standard C function strcpy.

83Plus:BCALLs:44E3

2005-03-25T18:44:45Z

69.242.210.167: /* Registers Destroyed */ AF

== Synopsis ==
'''Official Name:''' StrCpy

'''BCALL Address:''' 44E3

Copies a null-terminated string from one location to another.

=== Inputs ===
* DE: address to copy the string to
* HL: string to copy

=== Outputs ===
''None''

=== Registers Destroyed ===
* AF

== Comments ==
This B_CALL is basically the same as the standard C function strcpy.

83Plus:BCALLs:4291

2005-03-25T18:43:43Z

69.242.210.167: /* Registers Destroyed */ HL

== Synopsis ==
'''Official Name:''' RealName

'''BCALL Address:''' 4291

Sets OP1 to the name of a real variable given in the accumulator.

=== Inputs ===
* A: The letter of the real variable

=== Outputs ===
* OP1:

=== Registers Destroyed ===
* HL

== Comments ==
This B_CALL is rather pointless.

== Example ==
<nowiki>ld a, 'B'
B_CALL RealName
rst rFINDSYM</nowiki>