online/online.s
2018-10-17 14:40:01 -04:00

397 lines
13 KiB
ArmAsm

****************************************************************************
* *
* ONLINE - Lists all disk volumes connected to the computer *
* Copyright (C) 2017,2018 William L. Chatfield <bill_chatfield@yahoo.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. ** *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
****************************************************************************
ORG $2000
DSK online
TYP $FF ;SYSTEM TYPE
********************************
* *
* CONSTANTS *
* *
********************************
DEBUG EQU 0
ONLCMD EQU $C5 ;ID FOR ON_LINE MLI SYSTEM CALL
RDKEY EQU $FD0C ;READS 1 CHAR
CROUT EQU $FD8E ;SUB TO OUTPUT CARRIAGE RETURN
COUT EQU $FDED ;SUB TO OUTPUT A CHARACTER
PRBYTE EQU $FDDA ;SUB TO PRINT ERROR MESSAGE
MLI EQU $BF00 ;ADDRESS OF MLI ENTRY POINT
BELL EQU $FF3A ;SUBROUTINE TO BEEP
MAXREC EQU 16 ;MAX RECS RETURNED BY ON_LINE
BUFPTR EQU 6 ;WILL USE ZERO PAGE 6 & 7
MSGADR EQU 8
RECLEN EQU $10 ;THAT'S 16 IN DECIMAL
CLARG EQU 6
********************************
* *
* MACROS *
* *
********************************
DO 0 ;TURN OFF ASSEMBLY FOR MACROS
********************************
* *
* PUTS *
* *
********************************
PUTS MAC
TYA ;PRESERVE Y
PHA
LDY #0 ;PREPARE LOOP INDEX
]NEXTCHR LDA ]1,Y ;LOAD A CHARACTER
CMP #0 ;CHECK FOR END OF STRING
BEQ FINISH
JSR COUT
INY
JMP ]NEXTCHR
FINISH PLA ;RESTORE Y
TAY
EOM
********************************
* *
* PAUSE *
* *
********************************
PAUSE MAC
PUTS DPAUSE
JSR RDKEY
JSR CROUT
EOM
ADD2ADDR MAC
LDA ]1
CLC
ADC ]2
STA ]1
BCC DONE
INC ]1+1
DONE EOM
FIN ;END OF MACROS
********************************
* *
* MAIN *
* *
********************************
MAIN
LDA CLARG
CMP #'V'
BEQ PUTVERSION
CMP #'L'
BEQ PUTLICENSE
JMP CALLONLINE
PUTVERSION
PUTS VERSION
JSR CROUT
RTS
PUTLICENSE
PUTS LICENSE0
JSR CROUT
PUTS LICENSE1
JSR CROUT
PUTS LICENSE2
JSR CROUT
PUTS LICENSE3
JSR CROUT
RTS
CALLONLINE
JSR MLI ;CALL MACHINE LANGUAGE INTERFACE
DB ONLCMD ;SPECIFY THE ON_LINE SYSTEM CALL
DA ONLARGS ;SPECIFY ADDRESS OF ARGUMENTS
BEQ CONTINUE ;ON_LINE RETURNS 0 ON SUCCESS
JMP ERROR
*
* COPY THE ADDRESS OF THE OUTPUT BUFFER INTO BUFPTR
*
CONTINUE LDA #<BUFFER ;PUT LOW BYTE INTO ACCUMULATOR
STA BUFPTR ;ASSIGN LOW BYTE TO BUFPTR
LDA #>BUFFER ;PUT HIGH BYTE INTO ACCUMULATOR
STA BUFPTR+1 ;ASSIGN HIGH BYTE TO BUFPTR
*
* LOOP TO PROCESS 16 RECORDS
*
RECLOOP LDA RECNUM
CMP #MAXREC
BNE :CHKLAST
JMP ENDPROG
:CHKLAST LDY #0
LDA (BUFPTR),Y
CMP #0 ;LAST REC IF FIRST BYTE IS 0
BNE FINDDRV
JMP ENDPROG
* FIND DRIVE NUMBER. IT IS SPECIFIED BY THE HIGH BIT OF
* THE FIRST BYTE IN THE RECORD. A ZERO SPECIFIES DRIVE 1.
* A ONE SPECIFIES DRIVE 2.
FINDDRV LDY #0 ;SETUP FOR LDA INDIRECT INDEXED
LDA (BUFPTR),Y ;LOAD FIRST BYTE INTO ACCUM
AND #%10000000 ;FOCUS ON THE HIGH BIT
CLC ;DON'T LET THE CARRY BIT WRAP
LSR ;SHIFT BITS TO THE RIGHT
LSR ;AGAIN
LSR ;AGAIN
LSR ;...
LSR
LSR
LSR ;BIT ZERO NOW SPECIFIES DRIVE
ADC #1 ;CONVERT BIT TO DRIVE NUMBER
STA DRIVENUM ;STORE THE RESULT
*
* FIND SLOT NUMBER
*
LDY #0 ;SETUP FOR NEXT OP
LDA (BUFPTR),Y ;LOAD FIRST BYTE INTO ACCUM
AND #%01110000 ;FOCUS ON BITS 4,5, AND 6
LSR ;SHIFT BITS TO THE RIGHT
LSR ;DO IT AGAIN
LSR ;DO IT AGAIN
LSR ;DO IT AGAIN
STA SLOTNUM ;BITS 0,1,2 NOW SPECIFY SLOT NUM
*
* FIND VOLUME NAME LENGTH
*
LDY #0 ;SETUP FOR NEXT OP
LDA (BUFPTR),Y ;LOAD FIRST BYTE OF REC INTO A
AND #%00001111 ;FOCUS ON LOWER 4 BITS
STA NAMELEN ;STORE THE RESULT
DO DEBUG
PUTS DNAMELEN
LDA NAMELEN
JSR PRBYTE
JSR CROUT
FIN
*
* PRINT SLOT AND DRIVE
*
PRTSLOT
LDA #"S" ;AN 'S' WITH HIGH BIT SET
JSR COUT ;WRITE 'S'
LDA SLOTNUM ;PUT SLOT NUM IN ACCUMULATOR
CLC ;CLEAR CARRY FLAG FOR ADDITION
ADC #$B0 ;CONVERT TO ASCII & SET HI BIT
JSR COUT ;PRINT SLOTNUM
LDA #$AC ;COMMA WITH HIGH BIT SET
JSR COUT ;WRITE COMMA
LDA #"D" ;A 'D' WITH HIGH BIT SET
JSR COUT ;WRITE 'D'
LDA DRIVENUM ;PUT DRIVE NUM IN ACCUMULATOR
CLC ;CLEAR CARRY FLAG FOR ADDITION
ADC #$B0 ;CONVERT TO ASCII & SET HI BIT
JSR COUT ;WRITE DRIVENUM CHARACTER
LDA #" " ;SPACE WITH HIGH BIT SET
JSR COUT ;WRITE SPACE CHARACTER
*
* CHECK FOR EMPTY VOLUME NAME
*
LDY #0
CPY NAMELEN ;CHECK FOR EMPTY NAME
BNE WRITEVOL ;CONTINUE IF IT IS NOT EMPTY
INY ;MOVE INDEX TO LOC OF ERROR CODE
LDA (BUFPTR),Y ;LOAD THE ERROR CODE
JSR WRITEERR
JSR CROUT
JMP INCREC
*
* PRINT THE VOLUME NAME
*
WRITEVOL LDA #"/" ;SLASH WITH HIGH BIT SET
JSR COUT ;WRITE SLASH CHARACTER
LDY #1 ;SET INDEX TO FIRST CHAR OF NAME
:NEXTCHR LDA (BUFPTR),Y ;LOAD CHAR INTO ACCUMULATOR
ORA #%10000000 ;TURN ON THE HIGH BIT FOR PRINT
JSR COUT ;WRITE A CHARACTER OF VOL NAME
CPY NAMELEN ;CHECK IF LAST CHARACTER
BEQ :DONEVOL ;EXIT LOOP IF DONE
INY ;INCREMENT Y REGISTER
JMP :NEXTCHR ;LOOP TO NEXT CHARACTER
:DONEVOL JSR CROUT ;WRITE A CARRIAGE RETURN
*
* BOTTOM OF RECLOOP
*
INCREC INC RECNUM ;INCREMENT CURRENT RECORD NUM
*
* ADD 16 TO THE ADDRESS IN BUFPTR
*
LDA BUFPTR ;LOAD THE LOW BYTE OF BUFPTR
CLC ;CLEAR CARRY BIT IN PREP FOR ADD
ADC #RECLEN ;ADD RECLEN TO LOW BYTE
STA BUFPTR ;STORE CALCULATED LOW BYTE
BCC :NOCARRY ;IF CARRY NOT SET THEN NEXT REC
INC BUFPTR+1 ;INC HIGH BYTE IF CARRY WAS SET
:NOCARRY
DO DEBUG
PAUSE
FIN
JMP RECLOOP ;LOOP TO NEXT RECORD
ENDPROG
RTS ;RETURN TO WHATEVER CALLED PROG
*
* ERROR HANDLER
*
ERROR
JSR WRITEERR
JSR BELL ;BEEP
JSR CROUT ;WRITE CARRIAGE RETURN
RTS ;RETURN TO WHATEVER CALL PROGRAM
********************************
* *
* SUB WRITEERR *
* ERROR CODE MUST BE IN ACCUM *
* *
********************************
WRITEERR
STA ERRCODE
LDX #0
LDY #0
:NEXTERR
DO DEBUG
PUTS DERRCODE
LDA ERRCODE
JSR PRBYTE
JSR CROUT
FIN
LDA ERRCODE
CMP ERRCODES,X
BEQ :FOUND
INX
INY
INY
CPX ERRCOUNT
BMI :NEXTERR
* UNKNOWN ERROR CODE
LDA #"("
JSR COUT
PUTS UNKECODE
LDA ERRCODE
JSR PRBYTE
LDA #")"
JSR COUT
JMP :ENDSUB
:FOUND LDA ERRMSGS,Y ;LOAD A WITH LOW BYTE OF MSG
STA MSGADR ;STORE LOW BYTE INTO LOCAL
INY ;ADVANCE TO HIGH BYTE
LDA ERRMSGS,Y ;LOAD A WITH HIGH BYTE OF MSG
STA MSGADR+1 ;STORE HIGH BYTE INTO LOCAL
DO DEBUG
PUTS DMSGADR
LDA MSGADR
JSR PRBYTE
JSR CROUT
FIN
LDA #"("
JSR COUT
PUTS (MSGADR) ;WRITE THE ERROR MESSAGE
LDA #")"
JSR COUT
:ENDSUB RTS
********************************
* *
* VARIABLES *
* *
********************************
BUFFER DS 256 ;SPACE FOR 16 DISK VOL RECORDS
ONLARGS DB 2 ;PARAMETER COUNT
DB 0 ;UNIT NUMBER, 0=ALL
DA BUFFER ;ADDRESS OF OUTPUT BUFFER
DRIVENUM DB 0 ;BYTE TO STORE DRIVENUM
SLOTNUM DB 0 ;BYTE TO STORE SLOTNUM
NAMELEN DB 0 ;LENGTH OF A VOLUME NAME
RECNUM DB 0 ;CURRENT RECORD NUMBER
ERRCODE DB 0
DNAMELEN ASC "NAMELEN=",00
DERRCODE ASC "ERRCODE=",00
DMSGADR ASC "MSGADR=",00
DPAUSE ASC "PRESS ANY KEY TO CONTINUE",00
UNKECODE ASC "UNKNOWN ERROR CODE: ",00
*
* ERROR MESSAGES
*
ERRCOUNT DB 9
ERR03 ASC "NO DEVICE CONNECTED",00 ;Bug in AppleWin < 1.26.3.0
ERR27 ASC "I/O ERROR",00
ERR28 ASC "DEVICE NOT CONNECTED",00
ERR2E ASC "DISK SWITCHED: FILE STILL OPEN ON OTHER DISK",00
ERR45 ASC "VOLUME DIRECTORY NOT FOUND",00
ERR52 ASC "NOT A PRODOS DISK",00
ERR55 ASC "VOLUME CONTROL BLOCK FULL",00
ERR56 ASC "BAD BUFFER ADDRESS",00
ERR57 ASC "DUPLICATE VOLUME",00
*
* ERROR CODE TO MESSAGE TRANSLATION TABLE
*
ERRCODES
DB $03 ;BASIC code used improperly by AppleWin < 1.26.3
DB $27
DB $28
DB $2E
DB $45
DB $52
DB $55
DB $56
DB $57
ERRMSGS
DA ERR03 ;Bug in AppleWin < 1.26.3.0
DA ERR27
DA ERR28
DA ERR2E
DA ERR45
DA ERR52
DA ERR55
DA ERR56
DA ERR57
*
* LICENSE
*
LICENSE0 ASC "ONLINE",00
LICENSE1 ASC "Copyright (c) 2017,2018 Bill Chatfield",00
LICENSE2 ASC "Distributed under the GPLv2",00
LICENSE3 ASC "https://github.com/gungwald/online",00
*
* VERSION
*
VERSION ASC "ONLINE v1.0.1",00