Atari 400 Technical Reference Manual page 302

ERR LINE ADDR B1 B2 B3 B4
SID ( SERIAL BUS INPUT/OUTPUT CONTROLLER ) PAGE 41
1681 · PAGE
1682 SIO
1683
1684
1685 *=SIOV
1686 E459 4C 59 E9 JMP
SID iSIO ENTRY POINT
1687
1688 *=SIOINV
1689 E465 4C 44 E9 JMP SIOINT
iSIO INITIALIZATION ENTRY POINT
1690
1691 *=SENDEV
1692 E468
4C F2 EB JMP SENDEN
iSEND ENABLE ENTRY POINT
1693
1694
*=VCTABL-INTABS+VSERIN
1695
1696 E48A OF EB · WORD
ISRSIR iVSERIN
1697 E48C 90 EA
· WORD
ISRODN
i
VSEROR
1698 E48E CF EA
· WORD
ISRTD
i
VSEROC
1699
1700
1701
1702 *=SIOORG
1703
1704
i
SIO INITIALIZATION SUBROUTINE
1705
1706 E944
A9 3C
SIOINT: LDA #MOTRST
1707 E946 8D 02 D3 STA PACTL
i
TURN OFF MOTOR
1708
1709 E949 A9 3C LDA #NCOMHI
1710 E94B 8D 03 D3
STA PBCTL
iRAISE NOT COMMAND LINE
1711
1712
1713
E94E
A9 03
LDA #3
1714 E950 80 32 02
STA SSKCTL
iGET
POKEY OUT OF INITIALIZE MODE
1715 E953 85 41
STA SOUNDR
i
INIT POKE ADDRESS FOR GUIET
1/0
1716 E955 80 OF D2
STA SKCTL
1717
1718
1719 E958 60 RTS
iRETURN
1720
1721
1722
1723
1724
1725
1726 E959 BA SIO: TSX
1727
E95A 8E 18 03 STX STACKP
iSAVE STACK POINTER
1728 E95D A9 01
LDA #1
1729 E95F 85 42
STA CRITIC
1730
1731 E961 AD 00 03 LOA
DDEVIC
1732 E964 C9 60
CMP #CASET
1733 E966 DO 03 BNE
NOTCST iBRANCH IF NOT CASSETTE
1734 E968 4C 80 EB JMP CASENT
iOTHERWISE JUMP TO CASSETTE ENTER