!!! CIO Filter
This is a small ASM Routine that is a Filter Driver for the DOS CIO (D:) Handler. It intercepts the CIO calls and checks for SPECIAL commands.
! Filter Usage
Set start Sector Number
XIO 200,#chan, _sec-high_ , _sec-low_ ,"D:"
* _chan_ - IO Channel
* _sec-high_ - sectornumber, highbyte
* _sec-low_ - sectornumber, lowbyte
Set destination memory
XIO 201,#chan, _mem-high_ , _mem-low_ ,"D:"
* _chan_ - IO Channel
* _mem-high_ - memory, highbyte
* _mem-low_ - memory, lowbyte
Read sector
XIO 202,#chan, _count-high_ , _count-low_ ,"Dx:"
* _chan_ - IO Channel
* _count-high_ - sector count, highbyte (not implemented in this version)
* _count-low_ - sector count, lowbyte (not implemented in this version)
* _Dx:_ - Diskdrive number
Write sector
XIO 203,#chan, _count-high_ , _count-low_ ,"Dx:"
* _chan_ - IO Channel
* _count-high_ - sector count, highbyte (not implemented in this version)
* _count-low_ - sector count, lowbyte (not implemented in this version)
* _Dx:_ - Diskdrive number
!!Assembler (Bibo Assembler Source)
{{{
00010 .LI OFF
00020 ******************************
00030 * *
00040 * PROGRAMM:DEVICE FILTER *
00050 * AUTOR :CARSTEN STROTMANN *
00060 * DATUM :09.11.02 *
00070 * VERSION :1 *
00080 * FUER :ABBUC/APG *
00090 * *
00100 ******************************
00110 ;
00120 ; SIO CONTROL BLOCK
00130 ;
00140 DDEVIC = $0300
00150 DUNIT = $301
00160 DCMND = $302
00170 DSTATS = $303
00180 DBUF = $304
00190 DTIMLO = $306
00200 DBYT = $308
00210 DAUX1 = $30A
00220 DAUX2 = $30B
00230 ;
00240 ; ZERO PAGE IOCB
00250 ;
00260 ICHIDZ = $20
00270 ICDNOZ = $21
00280 ICCOMZ = $22
00290 ICSTAZ = $23
00300 ICBADZ = $24
00310 ICBPLZ = $26
00320 ICBLLZ = $28
00330 ICAX1Z = $2A
00340 ICAX2Z = $2B
00350 ICSPRZ = $2C
00360 ICHIDNOZ = $2E
00370 ;
00380 ; SCRATCH ZP BYTES
00390 ; USED DURING INSTALL
00400 HATBV = $DA
00410 ;
00420 ; FLOPPY-SIO BEFEHLE
00430 ;
00440 RDSEC = $52 ;SECTOR READ
00450 WRTSEC = $50 ;SECTOR WRITE
00460 SPDCNF = $4B ;CONFIGURATION
00470 JMPNOK = $4C ;JUMP
00480 JMPWOK = $4D ;JUMP & OK
00490 RDPERC = $4E ;PERCOM READ
00500 WRTPERC = $4F ;PERCOM WRITE
00510 ;
00520 ; SIO STUSBYTE
00530 ;
00540 DREAD = $40
00550 DWRITE = $80
00560 ;
00570 ; JUMP VECTORS
00580 ;
00590 SIO = $E459
00600 CIO = $E456
00610 PHENTV = $E486
00620 WARMSV = $E474
00630 ;
00640 ; HANDLERTABELLE
00650 ;
00660 HATABS = $31A
00670 ;
00680 ; MOEGLICHE FEHLERMELDUNGEN
00690 ;
00700 STOK = $01 ;OK
00710 BRKKEY = $80 ;BREAK KEY
00720 EOF = $88 ;END OF FILE
00730 WDD = $A0 ;WRONG DISK
00740 DSKFL = $A2 ;DISK FULL
00750 NFND = $AA ;NOT FOUND
00760 JOPN = $A1 ;JUST OPEN
00770 ;
00780 ; INIT VECTOR
00790 ;
00800 RUNAD = $02E0
00810 INITAD = $02E2
00820 ;
00830 ; DOSINIT
00840 ;
00850 DOSINI = $0C
00860 ;
00870 ; SPEICHERZEIGER
00880 ;
00890 MEMLO = $2E7
00900 LOMEM = $80
00910 ;
00920 ------------------------------
00930 ;
00940 ORG .OR $0600
00950 .OF D:FILTER.COM
00960 ;
00970 DOSSPCV .HX 0000
00980 MEMPTR .HX 0000
00990 SECPTR .HX 0000
01000 XSAVE .HX 00
01010 YSAVE .HX 00
01020 DDENS .HX 80
01030 ;
01040 DOSIN
01050 JSR WARMSV
01060 JSR FHINIT
01070 RTS
01080 ------------------------------
01090 INIT
01100 LDA DOSINI
01110 STA DOSIN+1
01120 LDA DOSINI+1
01130 STA DOSIN+2
01140 LDA #DOSIN
01150 STA DOSINI
01160 LDA /DOSIN
01170 STA DOSINI+1
01180 ------------------------------
01190 ; FILTER HANDLER INIT
01200 ; SCANNING DEVICE HANDLER
01210 ; TABLE FOR DOS ENTRY
01220 FHINIT
01230 LDX #0
01240 .1
01250 LDA HATABS,X
01260 BEQ NODOS ; END TABLE
01270 CMP #'D
01280 BEQ INSTALL
01290 INX
01300 INX
01310 INX
01320 CPX #$20
01330 BMI .1
01340 ;
01350 NODOS RTS
01360 ------------------------------
01370 INSTALL
01380 LDA HATABS+1,X
01390 STA HATBV
01400 LDA HATABS+2,X
01410 STA HATBV+1
01420 LDY #$A ;PTR TO SPECIAL
01430 LDA (HATBV),Y
01440 STA DOSSPCV
01450 LDA #FSPECIAL-1
01460 STA (HATBV),Y
01470 INY
01480 LDA (HATBV),Y
01490 STA DOSSPCV+1
01500 LDA /FSPECIAL-1
01510 STA (HATBV),Y
01520 ; LDA #PGMEND
01530 ; STA MEMLO
01540 ; STA LOMEM
01550 ; LDA /PGMEND
01560 ; STA MEMLO+1
01570 ; STA LOMEM+1
01580 RTS
01590 ------------------------------
01600 FSPECIAL
01610 OLDVEC
01620 STY YSAVE
01630 STX XSAVE
01640 LDX ICAX1Z
01650 LDY ICAX2Z
01660 LDA ICCOMZ
01670 CMP #$C8
01680 BNE .1
01690 JMP SETSEC
01700 .1
01710 CMP #$C9
01720 BNE .2
01730 JMP SETMEM
01740 .2
01750 CMP #$CA
01760 BNE .3
01770 JMP READSEC
01780 .3
01790 CMP #$CB
01800 BNE .4
01810 JMP WRITESEC
01820 .4
01830 .10
01840 LDX XSAVE
01850 LDY YSAVE
01860 LDA DOSSPCV+1
01870 PHA
01880 LDA DOSSPCV
01890 PHA
01900 RTS
01910 ------------------------------
01920 SETMEM
01930 STX MEMPTR+1
01940 STY MEMPTR
01950 CIOOK
01960 LDY #1
01970 RTS
01980 ------------------------------
01990 SETSEC
02000 STX SECPTR+1
02010 STY SECPTR
02020 JMP CIOOK
02030 ------------------------------
02040 READSEC
02050 LDA #RDSEC
02060 STA DCMND
02070 LDA #DREAD
02080 STA DSTATS
02090 DOSIO
02100 LDA ICDNOZ ; DEV #
02110 STA DUNIT
02120 LDA #$31
02130 STA DDEVIC
02140 LDA DDENS
02150 STA DBYT
02160 LDA #0
02170 STA DBYT+1
02180 ;
02190 LDA SECPTR
02200 STA DAUX1
02210 LDA SECPTR+1
02220 STA DAUX1+1
02230 LDA MEMPTR
02240 STA DBUF
02250 LDA MEMPTR+1
02260 STA DBUF+1
02270 LDA #7
02280 STA DTIMLO
02290 ;
02300 JMP SIO
02310 ;
02320 WRITESEC
02330 LDA #WRTSEC
02340 STA DCMND
02350 LDA #DWRITE
02360 STA DSTATS
02370 JMP DOSIO
02380 ------------------------------
02390 PGMEND
02400 .OR RUNAD
02410 .DA INIT
02420 ------------------------------
}}}
!!BASIC Demo
{{{
100 ------------------------------
110 REM SIMPLE SECTORCOPY
120 REM SECTOR 1-720, 128 BYT/SEC
130 ------------------------------
140 BRUN "D:FILTER.COM"
150 DIM MEM$(18*$80)
160 MEM=ADR(MEM$)
170 DIM DRIVE$(13)
180 FOR SEC=1 TO 720 STEP 18
190 DRIVE$="D1:"
200 FOR X=0 TO 17
210 XSEC=SEC+X
220 XMEM=MEM+(X*$80)
230 XIO 200,#3,TRUNC(XSEC/$0100),XSEC,DRIVE$
240 XIO 201,#3,TRUNC(XMEM/$0100),XMEM,DRIVE$
250 ? " LESE SEKTOR",XSEC;:? ">",HEX$(XMEM)
260 XIO 202,#3,0,0,DRIVE$
270 NEXT X
280 DRIVE$="D2:"
290 FOR X=0 TO 17
300 XSEC=SEC+X
310 XMEM=MEM+(X*$80)
320 XIO 200,#3,TRUNC(XSEC/$0100),XSEC,DRIVE$
330 XIO 201,#3,TRUNC(XMEM/$0100),XMEM,DRIVE$
340 ? " SCHREIBE SEKTOR",XSEC;:? ">",HEX$(XMEM)
350 XIO 203,#3,0,0,DRIVE$
360 NEXT X
370 NEXT SEC
380 ? " READY!"
}}}