Reduce code and organize into subroutines
This commit is contained in:
Bill Chatfield
parent
793b02cf94
commit
297fab0ef2
15
TODO
15
TODO
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@ -1,9 +1,6 @@
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1. Change to delkey.erase.bk
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2. Add delkey.reset
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3. If not delete key then forward to previous keyboard routine
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4. Don't change cursor. Keep whatever cursor exists at load time.
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5. Create program to detect if the handler is loaded: delkey.detect?.
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6. Add program to print explanation and instructions.
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7. Change subroutines to macros
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8. Implement a better test for 80-column mode, possibly check cursor; if is delete char then 40-column mode
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9. Add build and run instructions, explanation
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1. Split into 40-col and 80-col programs
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2. Have a loader that figures out if it's in 40 or 80 col mode and then
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load the right code.
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3. Make a release.
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4. Go back to $300 load address once split into 2 programs. Each need to be
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< 200 bytes to fit at that location.
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266
del2bs.s
266
del2bs.s
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@ -1,27 +1,28 @@
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********************************
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* *
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* DELETE KEY HANDLER *
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* DELETE KEY TO BACKSPACE *
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* CONVERTER *
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* *
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* AUTHOR: BILL CHATFIELD *
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* LICENSE: GPL *
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* *
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********************************
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*********************************************************
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* INPUT SUBROUTINE CALL SEQUENCE:
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* GETLN ($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 ($C305) FOR 80-COL,
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* DELHNDLR IN THIS FILE, OTHER OTHER
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* CUSTOM SUBROUTINE. BASICIN HANDLES
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* ESC SEQUENCES FOR 80-COLUMN.
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*********************************************************
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***********************************************************
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* INPUT SUBROUTINE CALL SEQUENCE: *
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* GETLN ($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 $803
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TYP $06 ;BINARY TYPE
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DSK del2bs ;OUTPUT FILE NAME
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TYP $06 ;BINARY TYPE
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DSK del2bs ;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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@ -143,7 +144,6 @@ POPYX mac
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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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@ -152,90 +152,91 @@ PUTS MAC
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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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* INSTALL VECTOR TO DEL2BS *
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* *
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********************************
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MAIN LDA #<DEL2BS
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STA KSWL
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LDA #>DEL2BS
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STA KSWH
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PUTS LOADMSG
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RTS
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MAIN LDA #<DEL2BS
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STA KSWL
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LDA #>DEL2BS
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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 SUBROUTINE *
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* *
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* PRECONDITIONS: *
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* 1. CURSOR AT CH & BASL - only works with 40-col
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* 2. ACCUM = ORIG SCREEN BYTE - only works with 40-col
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* 3. Y = VALUE IN CH - only works with 40-col
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* 1. CURSOR AT CH & BASL *
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* - only works with 40-col *
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* 2. ACCUM = ORIG SCREEN BYTE *
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* - only works with 40-col *
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* 3. Y = VALUE IN CH *
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* - only works with 40-col *
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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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DEL2BS STA ORIGCURS ;STORE THE ORIGINAL CURSOR CHAR
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STY CURSPOS
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BIT RDALTCHAR ;TEST FOR 80-COL ON
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BMI COL80
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JSR DEL2BS40
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JMP DONE
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COL80 JSR DEL2BS80
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DONE RTS
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DEL2BS STA ORIGCURS ;STORE THE ORIGINAL CURSOR CHAR
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STY CURSPOS
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PUSHY
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********************************
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* *
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* 40-COL DEL2BS SUBROUTINE *
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* *
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********************************
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DEL2BS40
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PUSHY
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JSR GETKEY ;LOAD "KEY" VARIABLE
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JSR CONV_DEL2BS
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STA KEY ;STORE IT BECAUSE A WILL GET WIPED
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LDA ORIGCURS
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LDY CURSPOS
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STA (BASL),Y ;REPLACE CURSOR
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POPY
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LDA KEY ;SETUP RETURN VALUE
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RTS
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LDA ORIGCURS ;FOLLOWING CODE NEEDS THIS
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BIT RDALTCHAR ;TEST FOR 80-COL ON
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BMI COL80
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***********************************************************************
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COL40 JSR GETKEY ;LOAD "KEY" VARIABLE
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JSR CONV_DEL2BS
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STA KEY ;STORE IT BECAUSE A WILL GET WIPED
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LDA ORIGCURS
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LDY CURSPOS
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STA (BASL),Y ;REPLACE CURSOR
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JMP FINISH
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***********************************************************************
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***********************************************************************
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COL80
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LDY OURCH ;GET CURSOR POSITION
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JSR PICK ;GET CURSOR CHARACTER
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STA CURSOR80 ;REMEMBER CURSOR CHARACTER
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JSR INVERT ;INVERT CHAR AT CURSOR POSITION
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NEXTKEY JSR GETKEY ;GET KEYBOARD KEY IN ACCUMULATOR
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JSR CONV_DEL2BS
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STA KEY ;REMEMBER WHAT KEY WAS TYPED
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CMP #ESC ;IS IT ESC?
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BNE NOT_ESC ;KEY IS NOT ESC
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JSR INVERT ;PREP FOR ESCAPING CURSOR
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JSR HANDLE_ESC
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JMP COL80
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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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STA KEY ;REMEMBER ARROW OVERED CHAR AS TYPED KEY
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NOTRTARROW
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LDY OURCH ;SET CURSOR POSITION
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JSR INVERT ;CURSOR CHAR MUST BE IN A
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***********************************************************************
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FINISH POPY ;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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* 80-COL DEL2BS SUBROUTINE *
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* *
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********************************
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DEL2BS80
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PUSHY
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LDY OURCH ;GET CURSOR POSITION
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JSR PICK ;GET CURSOR CHARACTER
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STA CURSOR80 ;REMEMBER CURSOR CHARACTER
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JSR INVERT ;INVERT CHAR AT CURSOR POSITION
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NEXTKEY JSR GETKEY ;GET KEYBOARD KEY IN ACCUMULATOR
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JSR CONV_DEL2BS
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STA KEY ;REMEMBER WHAT KEY WAS TYPED
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CMP #ESC ;IS IT ESC?
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BNE NOT_ESC ;KEY IS NOT ESC
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JSR INVERT ;PREP FOR ESCAPING CURSOR
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JSR HANDLE_ESC
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JMP DEL2BS80
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NOT_ESC CMP #RTARROW ;IS IT A RIGHT ARROW
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BNE NOT_RT ;NOT RIGHT ARROW THEN DONE
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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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STA KEY ;REMEMBER ARROW OVERED CHAR AS TYPED KEY
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NOT_RT LDY OURCH ;SET CURSOR POSITION
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JSR INVERT ;CURSOR CHAR MUST BE IN A
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POPY ;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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@ -248,88 +249,45 @@ FINISH POPY ;RESTORE X AND Y
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* 1. KEY IS IN ACCUMULATOR *
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* *
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********************************
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CONV_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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CONV_DEL2BS
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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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* PUTCHAR80 SUBROUTINE *
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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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* A - CHARACTER TO DISPLAY *
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* Y - DESIRED COLUMN *
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* HANDLE_ESC SUBROUTINE *
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* *
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********************************
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*PUTCHAR80
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* PHA
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* SEI ;DISABLE INTERRUPTS
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* STA SET80COL ;ENABLE MAIN/AUX MEM SWITCHING
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* TYA ;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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* PLA ;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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* RTS
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HANDLE_ESC
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JSR ESC_ON
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JSR GETKEY
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JSR ESC_OFF
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JSR UPSHFT
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AND #$7F
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LDY #$10
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ESC2 CMP ESCTAB,Y
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BEQ ESC3
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DEY
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BPL ESC2
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BMI ESCSPEC
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ESC3 LDA ESCCHAR,Y
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AND #$7F
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JSR CTLCHAR
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LDA ESCCHAR,Y
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BMI HANDLE_ESC
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RTS ;WAS JMP B.INPUT
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ESCSPEC TAY
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LDA DOS33_MODE
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CPY #$11
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BNE ESCSP1
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JSR X_NAK
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LDA #$98
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STA A2C_CHAR
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RTS ;WAS JMP BIORET
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ESCSP1 CPY #$05
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BNE ESCSP4
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AND #$DF
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ESCSP2 STA DOS33_MODE
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ESCSP3 RTS ;WAS JMP B.INPUT
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ESCSP4 CPY #$04
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BNE ESCSP3
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ORA #$20
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BNE ESCSP2
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RTS ;DID NOT EXIST IN ORIGINAL
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PUSHY
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JSR ESC_ON
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JSR GETKEY
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JSR ESC_OFF
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JSR UPSHFT
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AND #$7F
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LDY #$10
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ESC2 CMP ESCTAB,Y
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BEQ ESC3
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DEY
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BPL ESC2
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JMP ESCDONE
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ESC3 LDA ESCCHAR,Y
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AND #$7F
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JSR CTLCHAR
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LDA ESCCHAR,Y
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BMI HANDLE_ESC
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ESCDONE POPY
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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 TO BACKSPACE CONVERTER",0D,"AT ADDRESS $803",0D,00
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KEY DB 0
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ORIGCURS DB 0
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CURSPOS DB 0
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CURSOR80 DB 0
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LOADMSG ASC "LOADED DELETE TO BACKSPACE CONVERTER",0D,"AT ADDRESS $803",0D,00
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KEY DB 0
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ORIGCURS DB 0
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CURSPOS DB 0
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CURSOR80 DB 0
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@ -0,0 +1,36 @@
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HANDLE_ESC
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JSR ESC_ON
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JSR GETKEY
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JSR ESC_OFF
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JSR UPSHFT
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AND #$7F
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LDY #$10
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ESC2 CMP ESCTAB,Y
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BEQ ESC3
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DEY
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BPL ESC2
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BMI ESCSPEC
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ESC3 LDA ESCCHAR,Y
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AND #$7F
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JSR CTLCHAR
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LDA ESCCHAR,Y
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BMI HANDLE_ESC
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RTS ;WAS JMP B.INPUT
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ESCSPEC TAY
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LDA DOS33_MODE
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CPY #$11
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BNE ESCSP1
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JSR X_NAK
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LDA #$98
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STA A2C_CHAR
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RTS ;WAS JMP BIORET
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ESCSP1 CPY #$05
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BNE ESCSP4
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AND #$DF
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ESCSP2 STA DOS33_MODE
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ESCSP3 RTS ;WAS JMP B.INPUT
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ESCSP4 CPY #$04
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BNE ESCSP3
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ORA #$20
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BNE ESCSP2
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RTS ;DID NOT EXIST IN ORIGINAL
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@ -0,0 +1,30 @@
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********************************
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* *
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* PUTCHAR80 SUBROUTINE *
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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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* A - CHARACTER TO DISPLAY *
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* Y - DESIRED COLUMN *
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* *
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********************************
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PUTCHAR80
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PHA
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SEI ;DISABLE INTERRUPTS
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STA SET80COL ;ENABLE MAIN/AUX MEM SWITCHING
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TYA ;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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PLA ;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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RTS
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