Start to convert to S-C assembler syntax
This commit is contained in:
Bill Chatfield
parent
c7ca984275
commit
678c29acd3
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@ -0,0 +1 @@
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*.swp
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225
more.s → more.S
225
more.s → more.S
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@ -1,69 +1,65 @@
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pr#1
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:p
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********************************
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* *
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* MORE - UN*X MORE COMMAND *
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* ASSEMBLES WITH MERLIN *
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* ASSEMBLES WITH S-C *
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* *
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********************************
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DSK MORE ;WRITE ASSEMBLED FILE TO DISK
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TYP $06 ;$FF=SYSTEM, $06=BINARY
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ORG $2000 ;ASSEMBLE START ADDRESS
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* DSK MORE ;WRITE ASSEMBLED FILE TO DISK
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* TYP $06 ;$FF=SYSTEM, $06=BINARY
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.OR $2000 ;ASSEMBLE START ADDRESS
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*
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* SYSTEM VARIABLES
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IN EQU $200 ;256-CHAR INPUT BUF
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*
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IN .EQ $200 ;256-CHAR INPUT BUF
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*
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* SUBROUTINES IN MONITOR ROM: $F800 - $FFFF
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RDKEY EQU $FD0C ;READS A CHARACTER
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GETLN EQU $FD6A ;READS A LINE, WITH PROMPT($33)
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GETLN1 EQU $FD6F ;READS A LINE, NO PROMPT
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CROUT EQU $FD8E
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COUT EQU $FDED
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PRBYTE EQU $FDDA
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*
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RDKEY .EQ $FD0C ;READS A CHARACTER
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GETLN .EQ $FD6A ;READS A LINE, WITH PROMPT($33)
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GETLN1 .EQ $FD6F ;READS A LINE, NO PROMPT
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CROUT .EQ $FD8E
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COUT .EQ $FDED
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PRBYTE .EQ $FDDA
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*
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* SUBROUTINES IN BASIC.SYSTEM ROM:
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GETBUFR EQU $BEF5 ;ALLOCATE BUFFER, DESTROYS X & Y
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FREEBUFR EQU $BEF8 ;FREE BUFFER
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*
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GETBUFR .EQ $BEF5 ;ALLOCATE BUFFER, DESTROYS X & Y
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FREEBUFR .EQ $BEF8 ;FREE BUFFER
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*
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* PRODOS ENTRY POINT
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MLI EQU $BF00
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*
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MLI .EQ $BF00
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*
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* MEMORY LOCATIONS
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OURCH EQU $057B ;80-COL HORIZ CURSOR POSITION
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OURCV EQU $05FB ;VERTICAL CURSOR POSITION
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*
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OURCH .EQ $057B ;80-COL HORIZ CURSOR POSITION
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OURCV .EQ $05FB ;VERTICAL CURSOR POSITION
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*
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* ZERO-PAGE ADDRESSES
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ZP_A1L EQU $3C ;MONITOR GENERAL PURPOSE
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ZP_A1H EQU $3D ;MONITOR GENERAL PURPOSE
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*
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ZP.A1L .EQ $3C ;MONITOR GENERAL PURPOSE
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ZP.A1H .EQ $3D ;MONITOR GENERAL PURPOSE
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*
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* PRODOS COMMAND CODES
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OPENCMD EQU $C8
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READCMD EQU $CA
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CLOSCMD EQU $CC
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*
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OPENCMD .EQ $C8
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READCMD .EQ $CA
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CLOSCMD .EQ $CC
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*
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* CONSTANTS
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EOFERR EQU $4C ;ERROR CODE FOR END-OF-FILE
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PTR EQU $06 ;ONLY FREE 0-PAGE LOCATION
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MAXERCDE EQU $5A ;LARGEST ERROR CODE
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CR EQU $0D ;ASCII CARRIAGE RETURN
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CR_HIBIT EQU $8D ;CARRIAGE RET WITH HIGH BIT SET
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BUFSIZE EQU $00FF
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SCR_HGHT EQU 24 ;SCREEN HEIGHT
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*
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EOFERR .EQ $4C ;ERROR CODE FOR END-OF-FILE
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PTR .EQ $06 ;ONLY FREE 0-PAGE LOCATION
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MAXERCDE .EQ $5A ;LARGEST ERROR CODE
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CR .EQ $0D ;ASCII CARRIAGE RETURN
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CR.HIBIT .EQ $8D ;CARRIAGE RET WITH HIGH BIT SET
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BUFSIZE .EQ $00FF
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SCR.HGHT .EQ 24 ;SCREEN HEIGHT
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*
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* DEBUGGING
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TRACE EQU 0
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*
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TRACE .EQ 0
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********************************
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* *
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@ -72,10 +68,10 @@ TRACE EQU 0
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* *
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********************************
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PUSHY MAC
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PUSHY .MA
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TYA
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PHA
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<<<
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.EM
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********************************
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* *
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@ -84,10 +80,10 @@ PUSHY MAC
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* *
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********************************
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POPY MAC
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POPY .MA
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PLA
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TAY
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<<<
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.EM
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********************************
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* *
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@ -99,20 +95,20 @@ POPY MAC
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* *
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********************************
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CPIN MAC
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CPIN .MA
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PUSHY ;SAVE Y
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STX ]1 ;COPY LENGTH TO FIRST BYTE OF ]1
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LDY #0 ;INIT Y TO ZERO
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LOOP CPY ]1 ;COMPARE Y WITH LENGTH BYTE
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BEQ ENDLOOP ;DONE IF LENGTH IS REACHED
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:1 CPY ]1 ;COMPARE Y WITH LENGTH BYTE
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BEQ :2 ;DONE IF LENGTH IS REACHED
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LDA IN,Y ;LOAD IN[Y] INTO ACCUMULATOR
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CMP #CR ;COMPARE WITH CARRIAGE RETURN
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BEQ ENDLOOP ;STOP AT CARRIAGE RETURN
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BEQ :2 ;STOP AT CARRIAGE RETURN
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INY ;DEST STR IS 1 AHEAD OF IN BUF
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STA ]1,Y ;COPY CHAR TO DEST STR ]1
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JMP LOOP ;LOOP TO NEXT CHAR
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ENDLOOP POPY ;RESTORE Y
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<<<
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JMP :1 ;LOOP TO NEXT CHAR
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:2 POPY ;RESTORE Y
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.EM
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********************************
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* *
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@ -122,17 +118,17 @@ ENDLOOP POPY ;RESTORE Y
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* *
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********************************
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PUTS MAC
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PUTS .MA
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PUSHY
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LDY #0 ;INIT LOOP INDEX
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LOOP CPY ]1 ;HAS STR LENGTH BEEN REACHED
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BEQ ENDLOOP ;IF SO THEN FINISH
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:1 CPY ]1 ;HAS STR LENGTH BEEN REACHED
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BEQ :2 ;IF SO THEN FINISH
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INY ;MOVE TO INDEX OF NEXT CHAR
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LDA ]1,Y ;GET THE CHAR TO BE WRITTEN
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JSR COUT ;WRITE THE CHARACTER
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JMP LOOP ;LOOP
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ENDLOOP POPY
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<<<
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JMP :1 ;LOOP
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:2 POPY
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.EM
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********************************
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* *
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@ -142,20 +138,20 @@ ENDLOOP POPY
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* *
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********************************
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SET1 MAC
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SET1 .MA
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LDA #1
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STA ]1
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<<<
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.EM
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SET0 MAC
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SET0 .MA
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LDA #0
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STA ]1
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<<<
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.EM
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SET23 MAC
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SET23 .MA
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LDA #23
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STA ]1
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<<<
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.EM
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********************************
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* *
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@ -171,14 +167,14 @@ MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
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PUTS PROMPT
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JSR GETLN1 ;LENGTH IN X, CR AT END
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CPX #0 ;IS THE LENGTH ZERO?
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BEQ :END ;USER JUST PRESSED RETURN
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BEQ END ;USER JUST PRESSED RETURN
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CPIN FILENAME ;COPY "IN" BUF TO FILENAME
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*
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* GET FILE I/O BUFFER FOR OPEN CALL
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*
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LDA #4 ;FOUR 256 BYTE PAGES = 1KB
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JSR GETBUFR ;GET BUF FROM BASIC.SYSTEM
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BCS :ERRFWDR ;CARRY SET INDICATES AN ERROR
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BCS ERRFWDR ;CARRY SET INDICATES AN ERROR
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STA OBUFADDR+1 ;GETBUFR RETURNS HIBYTE IN A
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LDA #0 ;PREPARE
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STA OBUFADDR ;LOBYTE IS 0 B/C ADDR OF PAGE
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@ -188,7 +184,7 @@ MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
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JSR MLI
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DB OPENCMD
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DA OPENPRMS
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BNE :ERRFWDR
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BNE ERRFWDR
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*
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* COPY FILE NUMBER FROM OPEN PARAMETERS TO READ AND CLOSE
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*
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@ -200,12 +196,12 @@ MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
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*
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LDA #1 ;ONE 256 BYTE BUFFER
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JSR GETBUFR ;CALL BASIC.SYSTEM SUB
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BCS :ERRFWDR ;CARRY SET MEANS ERROR
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BCS ERRFWDR ;CARRY SET MEANS ERROR
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STA RBADDR+1 ;STORE HI-BYTE
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STA ZP_A1H ;AGAIN, FOR 0-PAGE INDIRECTION
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STA ZP.A1H ;AGAIN, FOR 0-PAGE INDIRECTION
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LDA #0 ;0 FOR LO-BYTE
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STA RBADDR ;STORE IT
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STA ZP_A1L ;AGAIN, FOR 0-PAGE INDIRECTION
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STA ZP.A1L ;AGAIN, FOR 0-PAGE INDIRECTION
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*
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* PRINT THE FILE
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*
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@ -230,17 +226,17 @@ MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
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*
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LDA READERR ;RELOAD THE READ RESULT CODE
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CMP EOFERR ;WAS IT AN EOF "ERROR"
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BEQ :END ;EOF IS NOT REALLY AN ERROR
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BEQ END ;EOF IS NOT REALLY AN ERROR
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CMP #0
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BNE :ERRFWDR
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BNE ERRFWDR
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LDA CLOSERR
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BNE :ERRFWDR
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JMP :END
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BNE ERRFWDR
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JMP END
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*
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* FINISH
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*
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:ERRFWDR JSR ERRPROC
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:END NOP
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ERRFWDR JSR ERRPROC
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END NOP
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RTS
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********************************
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@ -255,17 +251,17 @@ VIEWFILE
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FIN
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SET1 LINENUM ;INIT LINE NUMBER
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:LOOP JSR MLI ;CALL PRODOS TO READ FILE
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.1 JSR MLI ;CALL PRODOS TO READ FILE
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DB READCMD ;SPECIFY PRODOS READ COMMAND
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DA READPRMS ;READ PARAMETERS
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STA READERR ;SAVE RESULT OF READ OPERATION
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BNE :ENDLOOP ;IF ERROR THEN END SUB
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BNE .2 ;IF ERROR THEN END SUB
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JSR WRITEBUF ;WRITE TO SCREEN WHAT WAS READ
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LDA #1 ;PREPARE FOR NEXT OP
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CMP USRQUIT ;IF USER WANTS TO QUIT, THEN
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BEQ :ENDLOOP ;EXIT THE LOOP
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JMP :LOOP ;ELSE, GET THE NEXT BUFFER
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:ENDLOOP NOP
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BEQ .2 ;EXIT THE LOOP
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JMP .1 ;ELSE, GET THE NEXT BUFFER
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.2 NOP
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RTS
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********************************
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@ -277,8 +273,8 @@ VIEWFILE
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WRITEBUF
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PUSHY
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LDY #0 ;INIT CHAR COUNTER VARIABLE
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:LOOP CPY READCNT ;COMPARE TO MAX CHARS
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BEQ :ENDLOOP
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.1 CPY READCNT ;COMPARE TO MAX CHARS
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BEQ .3
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LDA (ZP_A1L),Y ;GET CHAR FROM BUFFER
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ORA #%10000000 ;TURN ON HIGH BIT FOR PRINTING
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JSR COUT ;COUT PRESERVES ACCUM
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@ -286,22 +282,21 @@ WRITEBUF
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* CHECK END OF LINE
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*
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CMP #CR_HIBIT ;COMPARE TO CARRIAGE RETURN
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BNE :CONT ;IF NOT END OF LINE, NEXT CHAR
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BNE .2 ;IF NOT END OF LINE, NEXT CHAR
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INC LINENUM ;NEXT LINE HAS BEEN REACHED
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*
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* CHECK AT END OF PAGE
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*
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LDA LINENUM
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CMP #SCR_HGHT ;AT BOTTOM OF SCREEN?
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BNE :CONT ;NO? THEN NEXT CHAR
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BNE .2 ;NO? THEN NEXT CHAR
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JSR STATBAR ;YES? THEN SHOW THE STATUS BAR
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LDA #1 ;SETUP FOR NEXT LINE
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CMP USRQUIT ;DID USER ASK TO QUIT
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BEQ :ENDLOOP ;YES? THEN END SUB
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:CONT INY ;STATBAR HAS ADJUSTED LINENUM
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JMP :LOOP
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:ENDLOOP NOP
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POPY
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BEQ .3 ;YES? THEN END SUB
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.2 INY ;STATBAR HAS ADJUSTED LINENUM
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JMP .1
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.3 POPY
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DO TRACE
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PUTS EXVIEW
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@ -339,19 +334,19 @@ STATBAR
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PUSHY
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PUTS BAR
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:LOOP JSR RDKEY ;GET A KEY FROM THE USER
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.1 JSR RDKEY ;GET A KEY FROM THE USER
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CMP #" " ;CHECK IF SPACE ENTERED
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BNE :CHKCR ;IF NOT FORWARD TO NEXT CHECK
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BNE .2 ;IF NOT FORWARD TO NEXT CHECK
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SET1 LINENUM ;ADVANCE ONE PAGE, STORE 1
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JMP :ENDLOOP ;PROCESSED SPACE SO DONE
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:CHKCR CMP #CR_HIBIT ;CHECK FOR CARRIAGE RETURN
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BNE :CHKQUIT
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JMP .4 ;PROCESSED SPACE SO DONE
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.2 CMP #CR_HIBIT ;CHECK FOR CARRIAGE RETURN
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BNE .3
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SET23 LINENUM
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JMP :ENDLOOP
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:CHKQUIT CMP #"Q" ;USER WANTS TO QUIT
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BNE :LOOP ;NO RECOGNIZED INPUT
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JMP .4
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.3 CMP #"Q" ;USER WANTS TO QUIT
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BNE .1 ;NO RECOGNIZED INPUT
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SET1 USRQUIT
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:ENDLOOP JSR ERASEBAR
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.4 JSR ERASEBAR
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POPY
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DO TRACE
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@ -374,13 +369,13 @@ ERASEBAR
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PUSHY
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SET0 OURCH ;RESET CURSOR TO BEG OF LINE
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LDY #0 ;INIT COUNTER FOR SPACES
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:LOOP CPY BAR ;FIRST BYTE IS LENGTH
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BEQ :ENDLOOP ;IF Y=LEN THEN DONE
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.1 CPY BAR ;FIRST BYTE IS LENGTH
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BEQ .2 ;IF Y=LEN THEN DONE
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LDA #" " ;LOAD SPACE
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JSR COUT ;WRITE TO SCREEN
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INY ;MAKE PROGRESS
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JMP :LOOP ;LOOP TO NEXT CHAR
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:ENDLOOP SET0 OURCH ;RESET CURSON TO BEG OF LINE
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JMP .1 ;LOOP TO NEXT CHAR
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.2 SET0 OURCH ;RESET CURSON TO BEG OF LINE
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POPY
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DO TRACE
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@ -453,9 +448,7 @@ CLOSFNUM DS 1
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* BUFFERS
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*
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* CONSUME ALL BYTES UP TO THE NEXT PAGE BOUNDRY
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FILLER DS \,$00
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*FILLER DS \,$00
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* MUST START ON PAGE BOUNDRY
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*OPENBUF DS 1024
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*READBUF DS BUFSIZE
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:
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