mirror of
https://github.com/gungwald/delhndlr.git
synced 2024-09-27 10:58:40 +00:00
First check-in
This commit is contained in:
parent
891ad0e613
commit
faa318ab4f
228
delhndlr.s
Normal file
228
delhndlr.s
Normal file
@ -0,0 +1,228 @@
|
|||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* DELETE KEY HANDLER *
|
||||||
|
* *
|
||||||
|
* AUTHOR: BILL CHATFIELD *
|
||||||
|
* LICENSE: GPL *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
ORG $801
|
||||||
|
DSK /HD1/SRC/DELHNDLR
|
||||||
|
|
||||||
|
CH EQU $24 ;HORIZ CHAR POS (40-COL)
|
||||||
|
BASL EQU $28 ;BASE ADDR FOR CURR VIDEO LINE
|
||||||
|
KSWL EQU $38 ;KEYBOARD SWITCH LOW BYTE
|
||||||
|
KSWH EQU $39 ;KEYBOARD SWITCH HIGH BYTE
|
||||||
|
OURCH EQU $57B ;HORIZONTAL POSITION (80-COL)
|
||||||
|
OURCV EQU $5FB ;VERTICAL POSITION (80-COL)
|
||||||
|
KBD EQU $C000 ;KEYBOARD DATA + STROBE
|
||||||
|
KBDSTRB EQU $C010 ;CLEAR KEYBOARD STROBE
|
||||||
|
CXROMON EQU $C007 ;TURN ON INTERNAL ROM
|
||||||
|
CXROMOFF EQU $C006 ;ENABLE SLOT ROMS
|
||||||
|
ALTCHAR EQU $C01E ;>=$80 IF IN 80-COL
|
||||||
|
COUT EQU $FDED ;WRITE A CHARACTER
|
||||||
|
|
||||||
|
* 80-COL SUBS INSIDE THE INTERNAL ROM
|
||||||
|
INVERT EQU $CEDD ;INVERT CHAR ON SCREEN
|
||||||
|
PICK EQU $CF01 ;PICK CHAR OFF SCREEN
|
||||||
|
|
||||||
|
* INPUT SUBS
|
||||||
|
RDKEY EQU $FD0C
|
||||||
|
RDCHAR EQU $FD35
|
||||||
|
KEYIN EQU $FD1B
|
||||||
|
BASICIN EQU $C305
|
||||||
|
GETLN EQU $FD6A
|
||||||
|
NOESC EQU $C9B7 ;HANDLES KEY OTHER THAN ESC
|
||||||
|
BINPUT EQU $C8F6
|
||||||
|
ESCAPING EQU $C918
|
||||||
|
IN EQU $200 ;256-CHAR INPUT BUFFER
|
||||||
|
|
||||||
|
ESC EQU $9B ;ESC WITH HIGH BIT SET
|
||||||
|
RTARROW EQU $95 ;RIGHT ARROW WITH HIGH BIT SET
|
||||||
|
DELETE EQU $FF ;DELETE WITH HIGH BIT SET
|
||||||
|
BKSPACE EQU $88 ;BACKSPACE WITH HIGH BIT SET
|
||||||
|
|
||||||
|
HEXDEC EQU $ED24 ;HEX-TO-DECIMAL CONVERSION
|
||||||
|
CROUT EQU $FD8E ;PRINT A CARRIAGE RETURN
|
||||||
|
STROUT EQU $DB3A ;PRINT NULL-TERM STRING IN AY
|
||||||
|
* MONITOR SUBS
|
||||||
|
PRINTXY EQU $F940 ;PRINT X & Y AS HEX
|
||||||
|
PRBYTE EQU $FDDA ;PRINT BYTE AS 2 HEX DIGITS
|
||||||
|
|
||||||
|
STOR80ON EQU $C001 ;ENABLE AUXILIARY MEM SWITCHING
|
||||||
|
PAGE2OFF EQU $C054 ;TURN ON MAIN MEMORY
|
||||||
|
PAGE2ON EQU $C055 ;TURN ON AUXILIARY MEMORY
|
||||||
|
|
||||||
|
DEBUG EQU 1
|
||||||
|
DEBUG2 EQU 0
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* PUTS MACRO *
|
||||||
|
* *
|
||||||
|
* APPLESOFT MUST BE IN MEMORY *
|
||||||
|
* BECAUSE THE STROUT SUB IS *
|
||||||
|
* USED. *
|
||||||
|
* *
|
||||||
|
* X & Y ARE PRESERVED *
|
||||||
|
* *
|
||||||
|
* ]1 - ADDRESS OF STRING *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
PUTS MAC
|
||||||
|
TYA ;PRESERVE Y
|
||||||
|
PHA
|
||||||
|
LDA #<]1 ;PUT LOW BYTE INTO A
|
||||||
|
LDY #>]1 ;PUT HIGH BYTE INTO Y
|
||||||
|
JSR STROUT ;CALL APPLESOFT'S STRING PRINT
|
||||||
|
PLA ;RESTORE Y
|
||||||
|
TAY
|
||||||
|
EOM
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* PUT80 MACRO *
|
||||||
|
* *
|
||||||
|
* IN 80-COL MODE EVEN COLUMNS *
|
||||||
|
* ARE IN AUXILIARY MEMORY *
|
||||||
|
* WHILE ODD COLUMNS ARE IN *
|
||||||
|
* MAIN MEMORY. *
|
||||||
|
* *
|
||||||
|
* ]1 - CHARACTER TO DISPLAY *
|
||||||
|
* ]2 - DESIRED COLUMN *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
PUT80 MAC
|
||||||
|
TYA ;MOVE Y TO A
|
||||||
|
PHA ;SAVE Y VALUE ON STACK
|
||||||
|
SEI ;DISABLE INTERRUPTS
|
||||||
|
STA STOR80ON ;ENABLE MAIN/AUX MEM SWITCHING
|
||||||
|
LDA ]2 ;LOAD 80-COL HORIZ CURSOR POSITN
|
||||||
|
LSR A ;DIVIDE BY 2 TO CALC PHYS COLUMN
|
||||||
|
BCC AUXMEM ;IF EVEN, COLUMN IS IN AUX MEM
|
||||||
|
MAINMEM STA PAGE2OFF ;TURN OFF AUX MEM, MAIN MEM ON
|
||||||
|
JMP CONTINUE ;AVOID AUX MEM ENABLE
|
||||||
|
AUXMEM STA PAGE2ON ;TURN ON AUX MEM, MAIN MEM OFF
|
||||||
|
CONTINUE TAY ;MOVE CURSOR POSITION TO Y
|
||||||
|
LDA ]1 ;LOAD THE CHARACTER TO DISPLAY
|
||||||
|
STA (BASL),Y ;DISPLAY THE CHARACTER
|
||||||
|
STA PAGE2OFF ;TURN MAIN MEM BACK ON
|
||||||
|
CLI ;ENABLE INTERRUPTS
|
||||||
|
PLA ;PULL Y VALUE FROM STACK
|
||||||
|
TAY ;RESTORE Y VALUE
|
||||||
|
EOM
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* INSTALL VECTOR TO HANDLER *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
MAIN
|
||||||
|
LDA #<DELHNDLR
|
||||||
|
STA KSWL
|
||||||
|
LDA #>DELHNDLR
|
||||||
|
STA KSWH
|
||||||
|
PUTS LOADMSG
|
||||||
|
RTS
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* KEYBOARD INPUT ROUTINE *
|
||||||
|
* *
|
||||||
|
* PRECONDITIONS: *
|
||||||
|
* 1. CURSOR AT CH & BASL *
|
||||||
|
* 2. ACCUM = ORIG SCREEN BYTE *
|
||||||
|
* 3. Y = VALUE IN CH *
|
||||||
|
* *
|
||||||
|
* POSTCONDITIONS: *
|
||||||
|
* 1. MUST RETURN CHAR IN ACCUM *
|
||||||
|
* 2. X & Y MUST NOT BE CHANGED *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
DELHNDLR
|
||||||
|
STA ORIGCURS ;STORE THE ORIGINAL CURSOR CHAR
|
||||||
|
TXA ;SAVE X
|
||||||
|
PHA
|
||||||
|
TYA ;SAVE Y
|
||||||
|
PHA
|
||||||
|
|
||||||
|
BIT ALTCHAR ;TEST FOR 80-COL ON
|
||||||
|
BMI COL80
|
||||||
|
|
||||||
|
COL40
|
||||||
|
JSR GETKEY ;LOAD "KEY" VARIABLE
|
||||||
|
JSR DEL2BS ;CONVERT DELETE TO BACKSPACE
|
||||||
|
LDA ORIGCURS
|
||||||
|
STA (BASL),Y ;REMOVE CURSOR
|
||||||
|
JMP FINISH
|
||||||
|
|
||||||
|
COL80
|
||||||
|
PUT80 #' ';OURCH ;DISPLAY OUR CURSOR, INVERSE SPC
|
||||||
|
|
||||||
|
NEXTKEY
|
||||||
|
JSR GETKEY ;LOAD "KEY" VARIABLE
|
||||||
|
JSR DEL2BS ;CONVERT DELETE TO BACKSPACE
|
||||||
|
CMP #ESC ;IS IT ESC?
|
||||||
|
BEQ NEXTKEY ;IGNORE ESC
|
||||||
|
CMP #RTARROW ;IS IT A RIGHT ARROW
|
||||||
|
BNE CLRCURS ;NOT RIGHT ARROW THEN DONE
|
||||||
|
LDY OURCH ;GET HORIZONTAL CURSOR POSITION
|
||||||
|
JSR PICK ;GRAB CHAR FROM SCREEN
|
||||||
|
ORA #$80 ;SET HIGH BIT
|
||||||
|
STA KEY
|
||||||
|
|
||||||
|
CLRCURS
|
||||||
|
PUT80 #" ";OURCH ;ERASE CURSOR
|
||||||
|
|
||||||
|
FINISH
|
||||||
|
PLA ;RESTORE Y
|
||||||
|
TAY
|
||||||
|
PLA ;RESTORE X
|
||||||
|
TAX
|
||||||
|
LDA KEY ;LOAD RETURN VALUE
|
||||||
|
RTS
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* GETKEY SUBROUTINE *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
GETKEY
|
||||||
|
BIT KBD ;TEST FOR KEY PRESSED
|
||||||
|
BPL GETKEY ;WAIT FOR KEY PRESSED
|
||||||
|
LDA KBD ;GET THE KEY THAT WAS PRESSED
|
||||||
|
BIT KBDSTRB ;CLEAR KEYBOARD STROBE
|
||||||
|
STA KEY ;STORE THE KEY THAT WAS READ
|
||||||
|
RTS
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* DEL2BS SUBROUTINE *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
DEL2BS
|
||||||
|
CMP #DELETE ;IS THE KEY IN A THE DELETE KEY
|
||||||
|
BNE D2BDONE
|
||||||
|
LDA #BKSPACE
|
||||||
|
STA KEY
|
||||||
|
D2BDONE
|
||||||
|
RTS
|
||||||
|
|
||||||
|
********************************
|
||||||
|
* *
|
||||||
|
* DATA *
|
||||||
|
* *
|
||||||
|
********************************
|
||||||
|
|
||||||
|
LOADMSG ASC "LOADED DELETE HANDLER",0D,00
|
||||||
|
KEY DB 0
|
||||||
|
ORIGCURS DB 0
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue
Block a user