Commodore 1581 - Fastload Utility; Status Byte Breakdown

FASTLOAD UTILITY
BYTE BIT 7 6 5 4 3 2 1 0
0001010 101
01 0 0 1 10 0 0 0
02 P X X 1 1 1.1 1
03 FILENAME
SWITCHES: P—sequential file bit (P = 1, does not have to be a program file)
X—don't care
PROTOCOL: Burst handshake
OUTPUT: Burst status byte preceding each sector transfered.
STATUS IS AS FOLLOWS: 0000000X—OK
* 00000010—file not found
** 00011111—EOI
"Values between 3 and 15 should be considered a file read error.
**The byte following the EOI status byte is the number of data bytes to follow.
STATUS BYTE BREAKDOWN
BIT 7 6 5 4 3 2 1 0
MODE DN SECTOR SIZE [ CONTROLLER STATUS ]
*MODE—1= Alien Disk Format (non-default physical format, or default physical
format without Directory and BAM information)
0=Resident Disk Format (default physical format with Directory and BAM
information)
DN—DRIVE NUMBER
*Resident Disk Format is based on whether required information is present in BAM/
DIRECTORY track.
SECTOR SIZE
00 128 BYTE SECTORS (NOT SUPPORTED)
01 256 BYTE SECTORS
10 512 BYTE SECTORS (DEFAULT)
11 ........ 1024 BYTE SECTORS
CONTROLLER STATUS
000X OK
0010 CAN'T FIND HEADER BLOCK
0011 NO ADDRESS MARK
0100 DATA BLOCK NOT PRESENT
0101 DATA CRC ERROR
0110 FORMAT ERROR
0111 VERIFYERROR
1000 WRITE PROTECT ERROR
1001 HEADER BLOCK CRC ERROR
1010 WRITE PROTECTED
96