mirror of
https://github.com/gungwald/delhndlr.git
synced 2024-06-08 03:29:27 +00:00
300 lines
9.6 KiB
ArmAsm
300 lines
9.6 KiB
ArmAsm
********************************
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* *
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* DELETE KEY HANDLER *
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* *
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* AUTHOR: BILL CHATFIELD *
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* LICENSE: GPL *
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* *
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********************************
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*********************************************************
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* INPUT SUBROUTINE CALL SEQUENCE:
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* GETLN ($FD6A) - READS A LINE INTO IN ($200) LENGTH IN X
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* '->RDCHAR ($FD35) - HANDLES ESC SEQUENCES FOR 40 COLUMN
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* '->RDKEY ($FD0C) - READS CHAR INTO ACCUMULATOR
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* '->KSW ($38) - POINTS TO KEYIN ($FD1B) FOR 40-COL
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* OR BASICIN ($C305) FOR 80-COL,
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* DELHNDLR IN THIS FILE, OTHER OTHER
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* CUSTOM SUBROUTINE. BASICIN HANDLES
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* ESC SEQUENCES FOR 80-COLUMN.
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*********************************************************
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ORG $300
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TYP $06 ;BINARY TYPE
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DSK delkey.clr.left ;OUTPUT FILE NAME
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WINWIDTH EQU $21
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CH EQU $24 ;HORIZ CHAR POS (40-COL)
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BASL EQU $28 ;BASE ADDR FOR CURR VIDEO LINE
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KSWL EQU $38 ;KEYBOARD SWITCH LOW BYTE
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KSWH EQU $39 ;KEYBOARD SWITCH HIGH BYTE
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OURCH EQU $57B ;HORIZONTAL POSITION (80-COL)
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OURCV EQU $5FB ;VERTICAL POSITION (80-COL)
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KBD EQU $C000 ;KEYBOARD DATA + STROBE
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CXROMOFF EQU $C006 ;ENABLE SLOT ROMS
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CXROMON EQU $C007 ;TURN ON INTERNAL ROM
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80COLOFF EQU $C00C ;Off: display 40 columns
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80COLON EQU $C00D ;On: display 80 columns
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KBDSTRB EQU $C010 ;CLEAR KEYBOARD STROBE
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ALTCHAR EQU $C01E ;Alt char set (1 = on)
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COUT EQU $FDED ;WRITE A CHARACTER
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* 80-COL SUBS INSIDE THE INTERNAL ROM
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GETKEY EQU $CB15 ;THIS DOES NOT SEEM TO EXIST
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INVERT EQU $CEDD ;INVERT CHAR ON SCREEN - DOES NOT WORK
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PICK EQU $CF01 ;PICK CHAR OFF SCREEN
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* INPUT SUBS
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RDKEY EQU $FD0C
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RDCHAR EQU $FD35
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KEYIN EQU $FD1B
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BASICIN EQU $C305
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GETLN EQU $FD6A
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NOESC EQU $C9B7 ;HANDLES KEY OTHER THAN ESC
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BINPUT EQU $C8F6
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ESCAPING EQU $C918
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IN EQU $200 ;256-CHAR INPUT BUFFER
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RD80VID EQU $C01F
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ESC EQU $9B ;ESC WITH HIGH BIT SET
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RTARROW EQU $95 ;RIGHT ARROW WITH HIGH BIT SET
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DELETE EQU $FF ;DELETE WITH HIGH BIT SET
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BKSPACE EQU $88 ;BACKSPACE WITH HIGH BIT SET
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HEXDEC EQU $ED24 ;HEX-TO-DECIMAL CONVERSION
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CROUT EQU $FD8E ;PRINT A CARRIAGE RETURN
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STROUT EQU $DB3A ;PRINT NULL-TERM STRING IN AY
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* MONITOR SUBS
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PRINTXY EQU $F940 ;PRINT X & Y AS HEX
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PRBYTE EQU $FDDA ;PRINT BYTE AS 2 HEX DIGITS
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SET80COL EQU $C001 ;ENABLE AUXILIARY MEM SWITCHING
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PAGE2OFF EQU $C054 ;TURN ON MAIN MEMORY
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PAGE2ON EQU $C055 ;TURN ON AUXILIARY MEMORY
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DEBUG EQU 1
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DEBUG2 EQU 0
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********************************
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* PUSHY MACRO *
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********************************
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PUSHY mac
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tya
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pha
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<<<
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********************************
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* POPY MACRO *
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********************************
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POPY mac
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pla
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tay
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<<<
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********************************
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* PUSHXY MACRO *
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********************************
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PUSHXY mac
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txa
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pha
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tya
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pha
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<<<
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********************************
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* POPYX MACRO *
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********************************
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POPYX mac
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pla
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tay
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pla
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tax
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<<<
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********************************
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* *
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* PUTS MACRO *
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* *
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* APPLESOFT MUST BE IN MEMORY *
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* BECAUSE THE STROUT SUB IS *
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* USED. *
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* *
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* X & Y ARE PRESERVED *
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* *
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* ]1 - ADDRESS OF STRING *
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* *
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********************************
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PUTS MAC
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PUSHY
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LDA #<]1 ;PUT LOW BYTE INTO A
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LDY #>]1 ;PUT HIGH BYTE INTO Y
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JSR STROUT ;CALL APPLESOFT'S STRING PRINT
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POPY
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<<<
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********************************
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* *
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* PUTC80 MACRO *
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* *
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* IN 80-COL MODE EVEN COLUMNS *
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* ARE IN AUXILIARY MEMORY *
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* WHILE ODD COLUMNS ARE IN *
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* MAIN MEMORY. *
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* *
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* ]1 - CHARACTER TO DISPLAY *
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* ]2 - DESIRED COLUMN *
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* *
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********************************
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PUTC80 MAC
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PUSHY
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SEI ;DISABLE INTERRUPTS
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STA STOR80ON ;ENABLE MAIN/AUX MEM SWITCHING
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LDA ]2 ;LOAD 80-COL HORIZ CURSOR POSITN
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LSR A ;DIVIDE BY 2 TO CALC PHYS COLUMN
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BCC AUXMEM ;IF EVEN, COLUMN IS IN AUX MEM
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MAINMEM STA PAGE2OFF ;TURN OFF AUX MEM, MAIN MEM ON
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JMP CONTINUE ;AVOID AUX MEM ENABLE
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AUXMEM STA PAGE2ON ;TURN ON AUX MEM, MAIN MEM OFF
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CONTINUE TAY ;MOVE CURSOR POSITION TO Y
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LDA ]1 ;LOAD THE CHARACTER TO DISPLAY
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STA (BASL),Y ;DISPLAY THE CHARACTER
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STA PAGE2OFF ;TURN MAIN MEM BACK ON
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CLI ;ENABLE INTERRUPTS
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POPY
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<<<
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PRINTHEX MAC
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PHA
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PUSHXY
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lda ]1
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JSR PRBYTE
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POPYX
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PLA
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<<<
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********************************
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* *
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* INSTALL VECTOR TO HANDLER *
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* *
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********************************
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MAIN LDA #<DELHNDLR
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STA KSWL
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LDA #>DELHNDLR
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STA KSWH
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PUTS LOADMSG
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RTS
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********************************
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* *
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* KEYBOARD INPUT ROUTINE *
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* *
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* PRECONDITIONS: *
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* 1. CURSOR AT CH & BASL *
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* 2. ACCUM = ORIG SCREEN BYTE *
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* 3. Y = VALUE IN CH *
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* *
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* POSTCONDITIONS: *
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* 1. MUST RETURN CHAR IN ACCUM *
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* 2. X & Y MUST NOT BE CHANGED *
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* *
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********************************
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DELHNDLR STA ORIGCURS ;STORE THE ORIGINAL CURSOR CHAR
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PUSHXY
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LDA ORIGCURS ;FOLLOWING CODE NEEDS THIS
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BIT ALTCHAR ;TEST FOR 80-COL ON
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BMI COL80
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***********************************************************************
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COL40 JSR GETKEY40 ;LOAD "KEY" VARIABLE
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JSR DEL2BS ;CONVERT DELETE TO BACKSPACE
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STA KEY ;STORE IT BECAUSE A WILL GET WIPED
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JMP FINISH
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***********************************************************************
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***********************************************************************
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COL80
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STA (BASL),Y
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PUTC80 #' ';OURCH
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NEXTKEY JSR GETKEY80 ;GET KEYBOARD KEY IN ACCUMULATOR
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CMP #ESC ;IS IT ESC?
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BNE NOT_ESC ;IGNORE ESC
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JSR ESCAPING ;HANDLE ESCAPE SEQUENCES
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JMP NEXTKEY
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NOT_ESC CMP #RTARROW ;IS IT A RIGHT ARROW
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BNE NOTRTARROW ;NOT RIGHT ARROW THEN DONE
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RTARROWHIT LDY OURCH ;GET HORIZONTAL CURSOR POSITION
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JSR PICK ;GRAB CHAR FROM SCREEN
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ORA #$80 ;SET HIGH BIT
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NOTRTARROW JSR DEL2BS ;CONVERT DELETE TO BACKSPACE
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STA KEY ;IT WILL GET WIPED
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PUTC80 #" ";OURCH
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***********************************************************************
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FINISH POPYX ;RESTORE X AND Y
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LDA KEY ;LOAD RETURN VALUE
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RTS
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********************************
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* *
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* GETKEY40 SUBROUTINE *
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* ORIGINAL CURSOR MUST BE IN A *
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* KEY TYPED IS PUT INTO A *
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* *
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********************************
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GETKEY40 BIT KBD ;TEST FOR KEY PRESSED
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BPL GETKEY40 ;WAIT FOR KEY PRESSED
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STA (BASL),Y ;CLEAR CURSOR
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LDA KBD ;GET THE KEY THAT WAS PRESSED
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BIT KBDSTRB ;CLEAR KEYBOARD STROBE
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RTS
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********************************
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* *
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* GETKEY80 SUBROUTINE *
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* ORIGINAL CURSOR MUST BE IN A *
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* KEY TYPED IS PUT INTO A *
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* *
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********************************
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GETKEY80 BIT KBD ;TEST FOR KEY PRESSED
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BPL GETKEY80 ;WAIT FOR KEY PRESSED
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LDA KBD ;GET THE KEY THAT WAS PRESSED
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BIT KBDSTRB ;CLEAR KEYBOARD STROBE
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RTS
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********************************
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* *
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* DEL2BS SUBROUTINE *
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* *
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* PRECONDITIONS: *
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* 1. KEY IS IN ACCUMULATOR *
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* *
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* POSTCONDITIONS: *
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* 1. KEY IS IN ACCUMULATOR *
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* *
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********************************
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DEL2BS CMP #DELETE ;IS THE KEY IN A THE DELETE KEY
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BNE D2BDONE
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LDA #BKSPACE
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D2BDONE RTS
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********************************
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* *
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* DATA *
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* *
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********************************
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LOADMSG ASC "LOADED DELETE KEY HANDLER",0D,00
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KEY DB 0
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ORIGCURS DB 0
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