Format Of QXL.WIN File

(Adapted from information on Austrian QL group's website)

Format of QXL.WIN file

QLWA Disk Drive Structure Keys (Tony Tebby source code)

	Main header of device
+00	long	"QLWA"
+04	word	lenth device name
+06	20 bytes ASCII	device name
+1A	word	0000 ?
+1C	word	random number
+1E	word	access counter
+20	word	0000 ?
+22	word	number of sectors (512 bytes) in cluster (4 => 2048 bytes)
+24	3 x word	0000 0000 0000 ?
+2A	word	total sectors (1)
+2C	word	free sectors (1)
+2E	word	formatted sectors (1)
+30	word	0001 ?
+32	word	pointer to first free cluster (2)
+34	word	pointer to main directory (2)
+36	long	lenth of main directory +header
+3A	3 x word	0000 0000 0000 ?
+40	words	linked cluster pointer map (3)

(1) virtual values if device > 33 MB

(2) if cluster = 2048 bytes (h800) then pointer x h800 => adress

(3) Linked cluster pointer map:

+0040 word pointer to next cluster or 0000 if end

+0042 word pointer to next cluster or 0000 if end

...

+xxxx word same until all clusters are pointed

Example reading main directory (win about 20M):

+0022: 0004 ----> cluster = h800

+0034: 001A ----> x800 = adress hD000 = DIR

now look at (001A x 2 + h40 = 0074) if 0000 then main directory has no more cluster else for example:

+0074: 1939 ----> x800 = adress hC9C800 more entries

now look at (1939 x 2 + h40 = 32B2)

+32B2: 2605 ----> x800 = adress h01302800 still entries

now look at (2605 x 2 + h40 = 4C4A)

+4C4A: 0000 no more cluster: end of main directory

	Structure of directories:
DIR+00	64 bytes (h40)	space for header (not used)
DIR+40+00	long	lenth of file (+header)
DIR+40+04	word	filetype (0=data, 1=exe-file, h00FF=subdirectory)
DIR+40+06	word	generally 0000 sometimes 0318
DIR+40+08	word	dataspace if exe-file else 0000
DIR+40+0A	word	generally 0000 sometimes 0318 if exe-file ?
DIR+40+0C	word	0000 ?
DIR+40+0E	word	file name lenth
DIR+40+10	36 bytes ASCII	file name
DIR+40+34	long	date or 0000 0000 if subdir
DIR+40+38	word	overwrite counter ?
DIR+40+3A	word	pointer to first file cluster (4)
DIR+40+3C	2 x word	0000 0000 ?

(4) Structure of file:

FILE+00 64 (h40) bytes of space for not used header (onely in the first cluster of file)

FILE+40 h7C0 bytes of data

then search next adress through clusterpointer: see example

adress+00 h800 bytes of data

until pointer = 0000

Tony Tebby source code:

;In der Regel gilt hier QXL.WIN = SCSI

; QLWA Disk Drive Structure Keys
qwa_id      equ    $0000    ; long ID
qwa.id      equ    'QLWA'
qwa_name    equ    $0004    ; string up to 20 characters space padded name
qwa_spr0    equ    $001a    ; 2 bytes spare - set to zero
qwa_uchk    equ    $001c    ; long update check (removable media only)
qwa_intl    equ    $0020    ; word interleave factor (0 SCSI)
qwa_sctg    equ    $0022    ; word sectors per group
qwa_sctt    equ    $0024    ; word sectors per track (0 SCSI)
qwa_trkc    equ    $0026    ; word tracks per cylinder (number of heads) (0 SCSI)
qwa_cyld    equ    $0028    ; word cylinders per drive
qwa_ngrp    equ    $002a    ; word number of groups
qwa_fgrp    equ    $002c    ; word number of free groups
qwa_sctm    equ    $002e    ; word sectors per map
qwa_nmap    equ    $0030    ; word number of maps
qwa_free    equ    $0032    ; word first free group
qwa_root    equ    $0034    ; word root directory number
qwa_rlen    equ    $0036    ; long root directory length
qwa_fcyl    equ    $003a    ; word first cylinder number (ST506)
qwa_fsct    equ    $003a    ; long first sector for this partition (SCSI)
qwa_park    equ    $003e    ; word park cylinder
qwa_gmap    equ    $0040    ; group map: each entry is number of next group or zero

; So, ich dachte das könnte noch interessant sein... vor allem vielleicht auch die "offiziellen" Namen der Speicherstellen zu wissen.

; File-header structure
hdr_flen    equ    $00    ; long    File LENgth
hdr_accs    equ    $04    ; byte    access control byte
hdr_type    equ    $05    ; byte    file TYPE
hdrt.exe    equ      1    ; executable
hdrt.rel    equ      2    ; relocatable
hdrt.ldr    equ      3    ; loader re-locatable file
hdrt.dir    equ    $ff    ; directory
hdr_info    equ    $06    ; 8*bytes additional information
hdr_data    equ    $06    ; long    program DATA space
hdr_xtra    equ    $0a    ; long    extra info
hdr_name    equ    $0e    ; string file name (up to 36 characters long)
hdr.nmln    equ     36
hdr_date    equ    $34    ; long    update date
hdr_vers    equ    $38    ; word    version number
hdr_flid    equ    $3a    ; word    File ID
hdr_bkup    equ    $3c    ; long    backup date
hdr_end     equ    $40    ; end of header

; nun, das war's

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