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From UIQ3 open-source software

Contents 1 Fileheader 2 Filenames 3 Filetypes 4 Passwords 5 Datafiles

Fileheader

Standart Plane

Standart Plane

Byte	Content
	FX-502P filenumber	FX-602P filenanme
-7	Filetype byte 1 – see below.
-6	Filetype byte 2 – see below.
-5	Low nibble $A, high nibble last digit of file number.	low nibble is low nibble of 6th character of the filename, high nibble is low nibble of the 5th character of the file name
-4	Low nibble second digit, high nibble first digit of file number.	low nibble is low nibble of 4th character of the filename, high nibble is low nibble of the 3rd character of the file name
-3	$FF	low nibble is low nibble of 2nt character of the filename, high nibble is low nibble of the 1st character of the file name
-2	$FF	low nibble is high nibble of 6th character of the filename, high nibble is high nibble of the 5th character of the file name
-1	$FF	low nibble is high nibble of 4th character of the filename, high nibble is high nibble of the 3rd character of the file name
0	$FF	low nibble is high nibble of 2nd character of the filename, high nibble is high nibble of the 1st character of the file name
1	Start of real programm or data.

Filenames

The way file name are encoded is rather tricky.

File name generation

Step	Operation	Result
1	Original Filename	"ABab12"
2	The characters are reversed	"21baBA"
3	To continue we need to byte hex codes	$72 $71 $91 $90 $31 $30
4	The byte hex codes are splitt into there nibbles.	$7 $2 $7 $1 $9 $1 $9 $0 $3 $1 $3 $0
5	Nibbles reorder – see colour code.	$1 $2 $0 $1 $0 $1 $7 $7 $9 $9 $3 $3
6	The nibbles are merged back to bytes	$12 $01 $01 $77 $99 $3 3
7	File Header	$04 $E0 $12 $01 $01 $77 $99 $3 3 $00

If you want to know the the file name you need to calculate as follows:

Char(1) =  (Header(-3) AND $0F          ) OR (( Header(0) AND $0F) LSHIFT 4)
Char(2) = ((Header(-3) AND $F0) RSHIFT 4) OR  ( Header(0) AND $F0)
Char(3) =  (Header(-4) AND $0F          ) OR (( Header(1) AND $0F) LSHIFT 4)
Char(4) = ((Header(-4) AND $F0) RSHIFT 4) OR  ( Header(1) AND $F0)
Char(3) =  (Header(-5) AND $0F          ) OR (( Header(2) AND $0F) LSHIFT 4)
Char(4) = ((Header(-5) AND $F0) RSHIFT 4) OR  ( Header(2) AND $F0)

Filetypes

The following file types are currently known.

standard Plane

Byte 1	Byte 2	Content	Created with	Displayed Type
$40	$40	M-Register data file	Mode 1 SAVE "" EXE	DF
		Display data file (numeric)	Mode 1 SAVE "" invEXE	DF
		Display data file (alpha)	Mode 1 SAVE "" invEXE	DF
$04	$0E	Program file	Mode 3 SAVE "" EXE	PF
$40	$0E	Password protected program file	Mode 3 SAVE "" EXE	PF
		All file (program and data)	Mode 3 SAVE "" invEXE	AF
		Password protected all file	Mode 3 SAVE "" infEXE	AF

Passwords

Passwörter - auch mumerische werden im Klartext mit Zeichen aus der Alpha_Plane gespeichert. Allerdings das letzte zeichen zu erst. Abgeschlossen werden sie mit dem Password ende markter $EC.

Datafiles

Each Memory Register is stored in 8 bytes beginning with byte 1. The Memory Register are stored M00-M09, M0F, M10-M19, M1F, etc. Each number is BCD encoded and normalized to ±X.XXXXX×10^±yy.

The mantissa if M register is only 10 digits (unlinke the mantissa of L register wich is 12 digits) and is stored in packed BCD, least significat digit first.

The exponent is three BCD digits in size and biased by 100 (See: Excess-N). That means an exponent of 101 stand for ×10¹, 100 for ×10⁰, 99 for ×10^-1 and so forth.

BCD Number

Byte	High Nibble	Low Nibble
1	exponent digit 2	exponent digit 3
2	???	exponent digit 1
3	mantissa digit 10	???
4	mantissa digit 8	mantissa digit 9
5	mantissa digit 6	mantissa digit 7
6	mantissa digit 4	mantissa digit 5
7	mantissa digit 2	mantissa digit 3
8	???	mantissa digit 1