451 lines
13 KiB
ArmAsm
451 lines
13 KiB
ArmAsm
********************************
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* *
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* MORE - UN*X MORE COMMAND *
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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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.OR $2000 ;ASSEMBLE START ADDRESS
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*
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* SYSTEM VARIABLES
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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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*
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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 ;BCC=OKAY & A=HIBYTE OF BUF
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;BCS=FAIL & A=ERRCODE
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;X & Y ARE DESTROYED
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FREEBUFR EQU $BEF8 ;FREE BUFFER
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* PRODOS ENTRY POINT
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PRODOS EQU $BF00 ;MACHINE LANG IFACE (MLI)
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* MEMORY LOCATIONS
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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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*
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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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*
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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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*
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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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*
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TRACE .EQ 0
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********************************
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* *
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* PUSH Y ONTO THE STACK *
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* DESTROYS A *
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* *
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********************************
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PUSHY .MA
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TYA
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PHA
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.EM
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********************************
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* *
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* POP Y FROM THE STACK *
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* DESTROYS A *
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* *
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********************************
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POPY .MA
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PLA
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TAY
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.EM
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********************************
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* *
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* COPY IN BUF TO STRING *
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* *
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* X CONTAINS LENGTH OF "IN" *
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* ]1 IS DEST STRING (LEN BYT) *
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* A IS DESTROYED *
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* *
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********************************
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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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: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 :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 :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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* WRITES A LENGTH PREFIXED *
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* STRING TO THE SCREEN *
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* A IS DESTROYED *
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* *
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********************************
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PUTS .MA
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PUSHY
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LDY #0 ;INIT LOOP INDEX
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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 :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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* SET TO #1 (IMMEDIATE 1) *
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* ]1 DESTINATION *
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* A IS DESTROYED *
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* *
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********************************
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SET1 .MA
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LDA #1
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STA ]1
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.EM
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SET0 .MA
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LDA #0
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STA ]1
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.EM
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SET23 .MA
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LDA #23
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STA ]1
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.EM
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********************************
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* *
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* MAIN PROGRAM *
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* *
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********************************
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MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
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>SET0 USRQUIT ;INITIALIZE TO "NO"
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*
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* GET FILE NAME
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*
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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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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 :OBUFERR ;CARRY CLEAR MEANS NO 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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:OPENFILE JSR PRODOS
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DB OPENCMD
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DA OPENPRMS
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BEQ :OPEN_OK
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JSR ERRPROC
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JMP :FREEOBUF
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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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:OPEN_OK LDA OPENFNUM
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STA READFNUM
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STA CLOSFNUM
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*
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* GET BUFFER FOR READ OPERATION FROM BASIC.SYSTEM
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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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BCC :RBUF_OK ;CARRY CLR MEANS NO ERROR
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JSR ERRPROC
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JMP :CLOSFILE
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:RBUF_OK STA RBADDR+1 ;STORE HI-BYTE
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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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*
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* PRINT THE FILE
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*
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JSR VIEWFILE
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*
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* CLEANUP
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*
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:FREERBUF JSR FREEBUFR ;FREE READ BUFFER
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:CLOSFILE JSR PRODOS ;CLOSE THE FILE
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DB CLOSCMD
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DA CLOSPRMS
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BCC FREEOBUF
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:OPENERR JSR ERRPROC
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:FREEOBUF JSR FREEBUFR ;FREE OPEN I/O BUFFER
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JMP :END
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:OBUFERR JSR ERRPROC
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:END NOP
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RTS
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********************************
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* *
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* VIEW FILE SUB *
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* *
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********************************
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VIEWFILE
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DO TRACE
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>PUTS ENVIEW
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FIN
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SET1 LINENUM ;INIT LINE NUMBER
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:LOOP JSR PRODOS ;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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BNE :READERR
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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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:READERR JSR ERRPROC
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:ENDLOOP NOP
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RTS
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********************************
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* *
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* WRITE BUFFER TO SCREEN *
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* *
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********************************
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WRITEBUF
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>PUSHY
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LDY #0 ;INIT CHAR COUNTER VARIABLE
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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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*
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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 .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 .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 .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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FIN
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RTS
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********************************
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* *
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* PRINT ASCII IN HEX *
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* *
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********************************
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PRASCII PHA
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LDA #"["
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JSR COUT
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PLA
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JSR PRBYTE
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LDA #"]"
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JSR COUT
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LDA #" "
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JSR COUT
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RTS
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********************************
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* *
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* DO THE STATUS BAR *
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* *
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********************************
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STATBAR
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DO TRACE
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>PUTS ENSTATB
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FIN
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>PUSHY
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>PUTS BAR
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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 .2 ;IF NOT FORWARD TO NEXT CHECK
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>SET1 LINENUM ;ADVANCE ONE PAGE, STORE 1
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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 .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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.4 JSR ERASEBAR
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>POPY
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DO TRACE
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>PUTS EXSTATB
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FIN
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RTS
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********************************
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* *
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* ERASE STATUS BAR *
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* *
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********************************
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ERASEBAR
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DO TRACE
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>PUTS ENERASEB
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FIN
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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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.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 .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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>PUTS EXERASEB
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FIN
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RTS
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********************************
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* *
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* ERROR HANDLER *
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* INPUT PARAM: ERRCODE *
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* *
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********************************
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ERRPROC
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LDA ERRCODE
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CMP #0
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BEQ :NOERR
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CMP #EOFERR
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BEQ :NOERR
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PUTS ERRTXT
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LDA ERRCODE
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JSR PRBYTE
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JSR CROUT
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:NOERR NOP
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RTS
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********************************
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* *
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* DATA DIVISION HAHA *
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* *
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********************************
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PROMPT .DA #5 ;LENGTH BYTE
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.AS "FILE:"
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ERRTXT .DA #6 ;LENGTH BYTE
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.AS "ERROR:"
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BAR .DA #42
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.AS '[RET] NEXT LINE / [SPC] NEXT PAGE / [Q]UIT'
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FILENAME .BS $FF
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ERRCODE .BS 1
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READERR .BS 1
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CLOSERR .BS 1
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LINENUM .BS 1
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USRQUIT .BS 1
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BUFCHAR .BS 1
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USRCHAR .BS 1
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ENVIEW STR 'ENTERING VIEWFILE'
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EXVIEW STR 'EXITING VIEWFILE'
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ENSTATB STR 'ENTERING STATUSBAR'
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EXSTATB STR 'EXITING STATUSBAR'
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ENERASEB STR 'ENTERING ERASEBAR'
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EXERASEB STR 'EXITING ERASEBAR'
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*
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* OPEN PARAMETERS
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*
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OPENPRMS .DA #3
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.DA FILENAME
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OBUFADDR .BS 2
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OPENFNUM .BS 1
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*
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* READ PARAMETERS
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*
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READPRMS .DA #4
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READFNUM .BS 1
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RBADDR .BS 2
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REQCNT .DA BUFSIZE
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READCNT .BS 2
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*
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* CLOSE PARAMETERS
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*
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CLOSPRMS .DA #1
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CLOSFNUM .BS 1
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*
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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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* 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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