| &BB00 | KM INITIALISE |
| Action | Initialises the Key Manager and sets up everything as it is when the computer is first switched on; the key buffer is emptied, Shift and Caps lock are tumed off amd all the expansion and translation tables are reset to normal; also see the routine KM RESET below |
| Entry | No entry conditions |
| Exit | AF, BC, DE and HL corrupt, and all other registers are preserved |
| &BB03 | KM RESET |
| Action | Resets the Key Manager; the key buffer is emptied and all current keys/characters are ignored |
| Entry | No entry conditions |
| Exit | AF, BC, DE and HL are corrupt and all other registers are preserved |
| Notes | See also KM INITIALISE above. On the 664 or 6128, the key buffer can also be cleared separately by calling the KM FLUSH routine |
| &BB06 | KM WAIT CHAR |
| Action | Waits for the next character from the keyboard buffer |
| Entry | No entry conditions |
| Exit | Carry is true, A holds the character value, the other flags are corrupt, and all other registers are preserved |
| &BB09 | KM READ CHAR |
| Action | Tests to see if a character is available from the keyboard buffer, but doesn't wait for one to become available |
| Entry | No entry conditions |
| Exit | If a character was available, then Carry is true, and A contains the character; otherwise Carry is false, and A is corrupt; in both cases, the other registers are preserved |
| &BB0C | KM CHAR RETURN |
| Action | Saves a character for the next use of KM WAIT CHAR or KM READ CHAR |
| Entry | A contains the ASCII code of the character to be put back |
| Exit | All registers are preserved |
| &BB0F | KM SET EXPAND |
| Action | Assigns a string to a key code |
| Entry | B holds the key code; C holds the length of the string; HL contains the address of the string (must be in RAM) |
| Exit | If it is OK, then Carry is true; otherwise Carry is false; in either case, A, BC, DE and HL are corrupt, and all other registers rlre preserved |
| &BB12 | KM GET EXPAND |
| Action | Reads a character from an expanded string of characters |
| Entry | A holds an expansion token (ie a key code) and L holds the character position number (starts from 0) |
| Exit | If it is OK, then Carry is true, and A holds the character; otherwise Carry is false, and A is corrupt; in either case, DE and flags are corrupt, and the other registers are preserved |
| &BB15 | KM EXP BUFFER |
| Action | Sets aside a buffer area for character expansion strings |
| Entry | DE holds the address of the buffer and HL holds the length of the buffer |
| Exit | If it is OK, then Carry is true; otherwise Carry is false; in either case, A, BC, DE and HL are corrupt |
| Notes | The buffer must be in the central 32K of RAM and must be at least 49 bytes long |
| &BB18 | KM WAIT KEY |
| Action | Waits for a key to be pressed - this routine does not expand any expansion tokens |
| Entry | No entry conditions |
| Exit | Carry is true, A holds the character or expansion token, and all other registers are preserved |
| &BB1B | KM READ KEY |
| Action | Tests whether a key is available from the keyboard |
| Entry | No entry conditions |
| Exit | If a key is available, then Carry is true, and A contains the character; otherwise Carry is false, and A is corrupt; in either case, the other registers are preserved |
| Notes | Any expansion tokens are not expanded |
| &BB1E | KM TEST KEY |
| Action | Tests if a particular key (or joystick direction or button) is pressed |
| Entry | A contains the key/joystick nurnber |
| Exit | If the requested key is pressed, then Zero is false; otherwise Zero is true for both, Carry is false A and HL are corrupt. C holds the Sbift and Control status and others are preserved |
| Notes | After calling this, C will hold the state of shift and control - if bit 7 is set then Control was pressed, and if bit 5 is set then Shift was pressed |
| &BB21 | KM GET STATE |
| Action | Gets the state of the Shift and Caps locks |
| Entry | No entry conditions |
| Exit | If L holds &FF then the shift lock is on, but if L holds &00 then the Shift lock is off; if H holds &FF then the caps lock is on, and if H holds &00 then the Caps lock is off; whatever the outcome, all the other registers are preserved |
| &BB24 | KM GET JOYSTICK |
| Action | Reads the present state of any joysticks attached |
| Entry | No entry conditions |
| Exit | H and A contains the state of joystick 0, L holds that state of joystick 1, and all others are preserved |
| Notes | The joystick states are bit significant and are as followsBit 0 - Up Bit1 - Down Bit2 - Left Bit3 - Right Bit4 - Fire2 Bit5 - Fire1 Bit6 - Spare Bit7 - Always zeroThe bits are set when the corresponding buttons or directions are operated |
| &BB27 | KM SET TRANSLATE |
| Action | Sets the token or character that is assigned to a key when neither Shift nor Control are pressed |
| Entry | A contains the key number and B contains the new token or character |
| Exit | AF and HL are corrupt, and all other registers are preserved |
| Notes | Special values for B are as follows&80 to &9F - these values correspond to the expansion tokens&FD - this causes the caps lock to toggle on and off&FE - this causes the shift lock to toggle on and off&FF - causes this key to be ignored |
| &BB2A | KM GET TRANSLATE |
| Action | Finds out what token or character will be assigned to a key when neither Shift nor Control are pressed |
| Entry | A contains the key number |
| Exit | A contains the token/character that is assigned, HL and flags are corrupt, and all others are preserved |
| Notes | See KM SET TRANSLATE for special values that can be returned |
| &BB2D | KM SET SHIFT |
| Action | Sets the token or character that will be assigned to a key when Shift is pressed as well |
| Entry | A contains the key number and B contains the new token or character |
| Exit | AF and HL are corrupt, and all others are preserved |
| Notes | See KM SET TRANSLATE for special values that can be set |
| &BB30 | KM GET SHIFT |
| Action | Finds out what token/character will be assigned to a key when Shift is pressed as well |
| Entry | A contains the key number |
| Exit | A contains the token/character that is assigned, HL and flags are corrupt, and all others are preserved |
| Notes | See KM SET TRANSLATE for special values that can be returned |
| &BB33 | KM SET CONTROL |
| Action | Sets the token or character that will be assigned to a key when Control is pressed as well |
| Entry | A contains the key number and B contains the new token/character |
| Exit | AF and HL are corrupt, and all others are preserved |
| Notes | See KM SET TRANSLATE for special values that can be set |
| &BB36 | KM GET CONTROL |
| Action | Finds out what token or character will be assigned to a key when Control is pressed as well |
| Entry | A contains the key number |
| Exit | A contains the token/character that is assigned, HL and flags are corrupt and all others are preserved |
| Notes | See KM SET TRANSLATE for special values that can be set |
| &BB39 | KM SET REPEAT |
| Action | Sets whether a key may repeat or not |
| Entry | A contains the key number B contains &00 if there is no repeat and &FF is it is to repeat |
| Exit | AF, BC and HL are corrupt, and all others are preserved |
| &BB3C | KM GET REPEAT |
| Action | Finds out whether a key is set to repeat or not |
| Entry | A contains a key number |
| Exit | If the key repeats, then Zero is false; if the key does not repeat, then Zero is true; in either case, A, HL and flags are corrupt, Carry is false, and all other registers are preserved |
| &BB3F | KM SET DELAY |
| Action | Sets the time that elapses before the first repeat, and also set the repeat speed |
| Entry | H contains the time before the first repeat, and L holds the time between repeats (repeat speed) |
| Exit | AF is corrupt, and all others are preserved |
| Notes | The values for the times are given in 1/5Oth seconds, and a value of 0 counts as 256 |
| &BB42 | KM GET DELAY |
| Action | Finds out the time that elapses before the first repeat and also the repeat speed |
| Entry | No entry conditions |
| Exit | H contains the time before the first repeat, and L holds the time between repeats, and all others are preserved |
| &BB45 | KM ARM BREAK |
| Action | Arms the Break mechanism |
| Entry | DE holds the address of the Break handling routine, C holds the ROM select address for this routine |
| Exit | AF, BC, DE and HL are corrupt, and all the other registers are preserved |
| &BB48 | KM DISARM BREAK |
| Action | Disables the Break mechanism |
| Entry | No entry conditions |
| Exit | AF and HL are corrupt, and all the other registers are preserved |
| &BB4B | KM BREAK EVENT |
| Action | Generates a Break interrupt if a Break routine has been specified by KM ARM BREAK |
| Entry | No entry conditions |
| Exit | AF and HL are corrupt, and all other registers are preserved |