Atari 400 Technical Reference Manual page 347

ERR LINE ADDR Bl B2 B3 B4 MONITOR
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MONITP.SRC
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3/9/79
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4:00
PAGE 86
3806
F26F 18 CLC
3807
F270 69 10 ADC
#S10
3808 F272 85 06
STA TRAMSZ
; INCR. RAM POINTER BY 4K.
3809
F274 DO E9 BNE HOWMCH iGO
FIND HOW MUCH RAM.
3810 F276 60
ENDRAM: RTS
3811
3812
3813
3814
3815
HARDWARE INITIALIZATION
3816
3817
3818 F277 A9 00 HARDI: LDA
#0
3819 F279 AA
TAX
3820 F27A 90 00 DO
CLRCHP: STA $0000, X
3821 F270 90 00 04
STA
$D400, X
3822 F280 9D 00 02 STA
$D200, X
3823 F283 9D 00 03
STA
$D300, X
3824 F286 E8
INX
3825 F287 DO F1
BNE CLRCHP
3826 F289 60 RTS
3827
3828
3829
o.
S. RAM SETUP
3830
3831 F28A C6 11
OSRAM: DEC BRKKEY
iTURN OFF BREAK KEY FLAG
3832 F28C A9 54 LOA
#.LOW.BRKKY2
3833
F28E
80 36 02
STA BRKI-<.Y
3834 F291 A9 E7 LOA
#.HIGH. BRKKY2
3835 F293 8D 37 02
STA BRKKY+1
3836 F296 A5 06
LDA TRAMSZ iREAO RAM SIZE IN TEMP.
REG.
3837 F298 80 E4 02
STA RAMSIZ
i
SAVE IT IN RAM SIZE.
3838
F29B 8D E6 02 STA
MEMTOP+l
i
INIT. MEMTOP ADOR HI BYTE
3839 F29E A9 00
LDA #0
3840
F2AO 8D E5 02 STA
MEMTOP
i
INIT. MEMTOP AD DR LO BYTE
3841 F2A3 A9 00
LDA #INIMLL
3842 F2A5 8D E7 02 STA
MEMLO
3843
F2A8 A9 07 LOA #INIMLH
3844 F2AA 80 E8 02
STA MEMLO+1
i
INITIALIZE MEMLO ADDR VECTOR
3845 F2AD 20 OC E4 JSR
EDITRV+$C
i
EDITOR INIT.
3846 F2BO 20 lC E4
JSR SCRENV+$C
; SCREEN INIT.
3847
F2B3 20 2C E4
JSR KEYBDV+$C ; KEYBOARD INIT.
3848 F2B6
20 3C E4 JSR
PRINTV+$C iPRINTER HANDLER IN IT
3849 F2B9 20 4C E4
JSR CASETV+$C
iCASSETTE HANDLER INIT
3850 F2BC
20 6E E4 JSR CIOINV
i
CIO INIT.
3851 F2BF 20 65 E4
JSR SIOINV
i
SIO INIT.
3852
F2C2 20 6B E4 JSR
INTINV
i
INTERRUPT HANDLER INIT.
3853 F2C5 AD 1F DO
LOA CONSOL
3854
F2C8 29 01 AND
#$1
3855 F2CA DO 02
BNE NOKEY
iGAME START KEY DEPRESSED?
3856
F2CC E6 4A INC
CKEY
i
YES, SET KEY FLAG.
3857 F2CE 60
NOKEY: RTS
3858
3859