Atari 400 Technical Reference Manual page 146

T'estaT't entrtj for the booted application. If the
booted software is not to take control, then
DOSVEC should remain unchanged.
LDA
STA
LDA
STA
#RESTRT
DOSVEC
#RESTRT/256
DOSVEC+l
RESTART LSB.
6. JSR indirectltj through DOSINI for initialization of the
application; the application will initialize and return.
NOTE: The OS enters the initialization point on evertj
system reset and power-up. Internal initialization can take
place during stjstem reset and power-up as well. Initialization
can also be deferred until Step 7 for controlling
applications.
7. JMP indirectly through DOSVEC to transfer control to the
app
I
ication.
NOTE: PreSSing the [SYSTEM. RESET] key after the application
is fully booted will cause steps
6
and 7 to be repeated.
Sample Diskette-Bootable Program Listing
This skeletal program can be booted from the diskette. It retains
control when it is entered.
;
THIS IS THE START OF THE PROGRAM FILE.
PST=
$0700
(OR SOME OTHER LOCATION>'
*=
PST
<. ORG)'
THIS IS THE diskette-boot CONTROL INFORMATION.
· BYTE 0
· BYTE
PND-PST+127/128
NUMBER OF RECORDS.
· WORD
PST MEMORY ADDRESS TO START LOAD.
· WORD
PINIT PROGRAM INIT.
OPERATING SYSTEM C016555 -- Section 10
161