Atari 400 Technical Reference Manual page 148

Shown below is a listing of the program to create diskette-boot files.
THIS PROGRAM WRITES A SINGLE ItFILEIl TO THE DISKETTE AND IS
USED IN CONJUNCTION WITH A PROCEDURE TO MAKE DISKETTE-
BOOTABLE FILES. THE FOLLOWING TWO SYMBOLS MUST BE EGUATED
USING THE MEMORY LIMITS OF THE PROGRAM TO BE COPIED:
'PST' = PROGRAM START ADDRESS (SEE SAMPLE PROGRAM).
'PND' = PROGRAM END ADDRESS (SEE SAMPLE PROGRAM).
SECSIZ=128 DISKETTE SECTOR SIZE.
PST= $0700
PND= $1324
FLEN= PND-PST+SECSIZ-l/SECSIZ; # OF SECTORS IN FILE.
$8000 ; THIS PROGRAM'S ORIGIN.
BOOTB BRK
;
***
LOAD APPLICATION
***
;
SET UP DEVICE CONTROL BLOCK FOR DISKETTE HANDLER CALL
LDA
#FLEN # OF SECTORS TO WRITE.
STA COUNT
LDA
#1 DISK DRIVE #1.
STA DUNIT
LDA
#'W SET UP FOR WRITE WITH CHECK.
STA DCOMND
LDA #PST
POINT TO START OF APPLIC. PROG.
STA DBUFLO
LDA
4tPST/256
STA DBUFHI
LDA
#01
SET UP STARTING SECTOR
*
=
0001.
STA DAUX1
LDA #00
STA DAUX2
OPERATING SYSTEM C016555 -- Section 10
163