Atari 400 Technical Reference Manual page 138

Bootable Handler
The diskette- or cassette-booted software will insert the
handler's vector table pointer and name to the device table
whenever the booted software's initialization
entr~
point is
entered (on power-up and system reset). Remember that both
power-up and
s~stem
reset clear the device table of all but the
resident handler entries.
Cartridge Resident Handler
The cartridge software will insert the handler'S vector table
pointer and name to the device table whenever the cartridge's
initialization entry point is entered (on power-up and
system reset). Remember that both power-up and
s~stem
reset
clear the device table of all but the resident handler entries;
therefore the device table must be reestablished
b~
the
handler-initialization procedure upon
ever~
entry.
FLOWCHARTS
The following pages contain process flowcharts showing the SIO
and peripheral actions for the Serial bus command forms.
OPERATING SYSTEM C016555 -- Section 9
153