Luxor ABC 800: System varilables

Address Label Description

FD00

Place of the file in the library

Bit #	Description
`07-04`	Library sector (0-15)
`03-00`	Library offset (0-240 step 16)

FD01

Select code of the disk

FD02-FD03 Actual logic record number

FD04-FD05 Logic record number in actial bitmapgroup

FD06-FD07 Actual bitmapgroup

FD08-DF09 Physical startrecord of the file

FD0A-FD0B Highest logic record number in the file

FD0C-FD0D Actual random access record in buffer

FD0E-FD11 Position in buffer

FD12-FD13 Pointer: DOSBUF0 start address

FD14 Number of current DOSBUF multiplied by 10h

FD15

Disk error code

Bit #	Description
`07`	Not ready
`06`	Write protected
`04`	Not found (disk error)
`03`	CRC error
`01`	Command error (Invalid command for disk controller)
`00`	Busy

FD16-FD17 (unused)

FD18 Retry-count (start value is 5 or 3)

FD19-FD1B (unused)

FD1C A SAVE OPEN/PREPARE/CLOSE/RESIZE

FD1D-FD1E BC SAVE Available space for BC-register

FD1F-FD20 DE SAVE Available space for DE-register

FD21-FD22 ON ERR 35 Vector: ERROR 35 (address from FD33h if zero)

FD23-FD24 ON ERR 36 Vector: ERROR 36 (address from FD33h if zero)

FD25-FD26 ON ERR 37 Vector: ERROR 37 (address from FD33h if zero)

FD27-FD28 ON ERR 38 Vector: ERROR 38 (address from FD33h if zero)

FD29-FD2A ON ERR 39 Vector: ERROR 39 (address from FD33h if zero)

FD2B-FD2C ON ERR 40 Vector: ERROR 40 (address from FD33h if zero)

FD2D-FD2E ON ERR 41 Vector: ERROR 41 (address from FD33h if zero)

FD2F-FD30 ON ERR 42 Vector: ERROR 42 (address from FD33h if zero)

FD31-FD32 ON ERR 43 Vector: ERROR 43 (address from FD33h if zero)

FD33-FD34 ON ERR DEF Vector: Default error

FD35-FD3F (unused)

FD40

DOS logic file tables, containing as follows

Offset	Size	Description
`00`	Byte	Unit number (0-31) or FFh if not specified
`01`	Byte	FFh
`02`	8-byte	File name
`0A`	3-byte	File type or spaces
`0D`	3-byte	Drive name or spaces

This page has been created by Sami Rautiainen.
Read the small print.	Last updated September 05, 2020.