Atari 400 Technical Reference Manual page 149

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NOW WRITE THE FILE ONE SECTOR AT A TIME.
SOT010 JSR
DSKINV
WRITE ONE SECTOR.
SMI
DERR ERROR.
LOA DSUFLO INCREMENT MEMORY ADDRESS.
CLC
ADC #SECSIZ
STA
DSUFLO
LDA DSUFHI
ADC #0
STA DSUFHI
INC
DAUXI INCREMENT SECTOR
#.
SNE BOT020
INC DAUX2
BOT020 DEC COUNT t10RE SECTORS TO WRITE?
SNE SOT010 YES.
BRK STOP WHEN DONE.
DERR
SRK STOP ON ERROR.
COUNT *=*+1
SECTOR COUNT.
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THIS IS THE CARTRIDGE HEADER
*=
$BFF9 "An CARTRIDGE.
IN IT RTS
· WORD
BOOTB
· BYTE
0,4
· WORD
INIT
· END
CASSETTE-BOOTED SOFTWARE
You can boot software from the cassette as well as from the
diskette, at power-up. The following
re~uirements
must be met in order
to boot from the cassette:
o You must be pressing the [START] key as power is
applied to the system.
o A cassette tape with a proper boot format file must be
installed in the cassette drive, and the PLAY button must be
pressed.
OPERATING SYSTEM C016555 -- Section 10
164