Atari 400 Technical Reference Manual page 319

ERR LINE ADDR B1 B2 B3 B4
SIO ( SERIAL BUS INPUT/OUTPUT CONTROLLER )
PAGE 58
2599
ED60 A4 14 LDY RTCLOK+2
iREAD TIMER LO
&
HI BYTES
2600 ED62 20 A3 EC
JSR COMPUT iNO, COMPUTE BAUD RATE
2601 ED65 8C EE 02 STY
CBAUDL
2602
ED68 8D EF 02 STA CBAUDH
iSET BAUD RATE INTO RAM CELLS
2603 ED6B AO 09 LDY
#9 iSET BIT COUNTER FOR 9 BITS
2604
ED6D DO CC BNE COUNT
2605
2606 ED6F AD EE 02
GOREAD: LDA CBAUDL
2607 ED72 8D 04 D2 STA AUDF3
2608 ED75
AD EF 02 LDA CBAUDH
2609 ED78 8D 06 D2 STA
AUDF4 iSET POKEY FREG REGS FOR BAUD RATE
2610 ED7B A9 00 LDA
#0
2611 ED7D 8D OF D2 STA
SKSTAT
2612 ED80 AD 32 02
LDA SSKCTL
2613 ED83
8D OF D2 STA
SKSTAT
i
INIT. POKEY SERIAL PORT
2614 ED86 A9 55
LDA #$55
2615 ED88 91 32
STA
(BUFRLO),Y iSTORE '$55' AS FIRST RCV. BUFFER
2616 ED8A C8
INY
2617 ED8B 91 32 STA
<BUFRLO), Y
2618 ED8D A9 AA LDA
#$AA
2619
ED8F
85 31
STA CHKSUM
iSTORE CHECKSUM FOR 2 BYTES OF '$AA'
2620
ED91
18
CLC
2621 ED92 AS 32
LDA BUFRLO
2622 ED94 69 02 ADC
#2
2623 ED96 85 32 STA
BUFRLO
2624 ED98 AS 33
LDA BUFRHI
2625 ED9A 69 00
ADC #0
2626 ED9C 85 33
STA BUFRHI
i
INCR. BUFFER POINTER BY 1
2627 ED9E 58 CLI
2628 ED9F 60 RTS
2629
2630
2631
2632 EDAO 20 SF EC BROKE: JSR SENDDS
iBREAK KEY WAS PRESSED, SO PREPARE
2633 EDA3 A9 3C LDA #MOTRST
i
TO RETURN
2634 EDA5 8D 02 D3
STA PACTL
i
TURN OFF MOTOR
2635 EDA8 8D 03 D3
STA PBCTL iRAISE NOT COMMAND LINE
2636
2637 EDAB A9 80 LDA
#BRJ.<.ABT
2638 EDAD 85 30 STA
STATUS iSTORE BREAK ABORT STATUS CODE
2639
/ '
2640 EDAF AE 18 03 LDX STACKP
2641
EDB2
9A
TXS iRESTORE STACK POINTER
2642
2643
EDB'3
C6 11 DEC
BRKKEY iSET BREAK KEY FLAG TO NONZERO
2644 EDB5 58 CLI
i
ALLOW IRQ'S
2645
2646 EDB6 4C 00 EA
JMP RETURN
i
GO RETURN
2647
2648
2649
2650
2651
2652 EDB9 A9 EC SETVBX: LDA
#JTADRL iSTORE TIME OUT ROUTINE ADDRESS