Fileheader

Filenames

The way file name are encoded is rather tricky.

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.

Passwords

Passwörter - auch mumerische werden im Klartext mit Zeichen aus der 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.