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Frequently Asked Questions are a popular means of exchanging basic information, normally pointed
to by RTFM or 'Read That Fine Manual' (amongst other more stressed meanings). Please send me any questions that you've been asked, or that you'd like an answer to anyway. If you have an answer already - please send both your Q and A!
What is the format of a FLEX disk? NEW! track 0 sector 0 boot sector 0 2 extended boot sector 0 3 System Information Record (SIR) 0 4 not used 0 5 start of the directory area. ... ... the rest of track 0 is used for directory storage 1 1 start of the data and program storage area of disketteOn double sided diskettes, the sector numbers on the second side continue on from the numbers on the first side. That is, if track 1 sector 10 is the last sector on side 0, then track 1 side 1 will start with sector number 11 and end with sector number 20. Track 2 side 0 will start over with sector number 1. This is the layout of the SIR: The first 16 bytes are not used (all zeros) offset(hex) size(hex) contents ----------- --------- ------------------------- $10 $0B Volume Label $1B $01 Volume Number High byte $1C $01 Volume Number Low byte $1D $01 First User Track $1E $01 First User Sector $1F $01 Last User Track $20 $01 Last User Sector $21 $01 Total Sectors High byte $22 $01 Total Sectors Low byte $23 $01 Creation Month $24 $01 Creation Day $25 $01 Creation Year $26 $01 Max Track $27 $01 Max SectorThe First User Track and Sector mark the beginning of the free chain. This is the chain of available unused sectors. The Last User Track and Sector mark the end of this chain. top
What is a random file?
What is the directory structure of a FLEX disk? NEW! Each Directory Entry is laid out as follows: The first 16 bytes are not used (all zeros) offset(hex) size(hex) contents ----------- --------- ------------------------- $10 $08 File Name $18 $03 File Extension $1B $02 Unused $1D $01 Start Track $1E $01 Start Sector $1F $01 End Track $20 $01 End Sector $21 $01 Total Sectors High byte $22 $01 Total Sectors Low byte $23 $01 Random File Indicator $24 $01 Unused $25 $01 Creation Month $26 $01 Creation Day $27 $01 Creation YearThe Start Track and Sector mark the beginning of the linked list of sectors that make up the file. The directory sectors are linked, but do not contain a sequence number like other linked sectors do. top
What are DSK files?
What is the difference between 6800 and 6809 FLEX?
What is UniFlex? |