Atari 400 Technical Reference Manual page 315

ERR LINE ADDR B1
92
B3 B4 SIO ( SERIAL BUS INPUT/OUTPUT CONTROLLER PAGE 54
2383 EC74 60 RTS ; RETURN
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
;
SET DDEVICE TIME OUT VALUES IN Y,X SUBROUTINE
2395
2396 EC75
AD 06 03 STTMOT: LDA DTIMLO iGET DEVICE TIME OUT IN 1 SECOND INCR
2397 EC78
6A ROR A
iPUT 6 HI BITS IN X, LO 2 BITS IN Y
2398 EC79 6A
ROR A
2399 EC7A A8 TAY
i
TEMP SAVE
2400 EC7B 29 3F AND
#$3F
iMASK OFF 2 HI BITS
2401 EC7D AA TAX iTHIS IS HI BYTE OF TIME OUT
2402
2403 EC7E 98 TYA iRESTORE
2404 EC7F
6A ROR A
2405 EC80 29 CO AND #$CO iMASK OFF ALL BUT 2 HI BITS
2406 EC82 A8 TAY
iTHIS IS La BYTE OF TIME OUT
2407
2408 EC83 60 RTS
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419 EC84 OF EB INTTBL: · WORD ISRSIR iSERIAL INPUT READY
2420 EC86
90 EA
· WORD
ISRODN iOUTPUT DATA NEEDED
2421 EC88 CF EA
· WORD
ISRTD iTRANSMISSION DONE
2422
2423 OOEB SIRHI ISRSIR/256 iSERIAL INPUT READY ISR ADDRESS
2424 OOOF SIRLO
=
(-256>*SIRHI+ISRSIR
2425 OOEA ODNHI ISRODN/256
iOUTPUT
DATA NEEDED ISR ADDRESS
2426 0090 ODNLO
=
(-256>*ODNHI+ISRODN
2427 OOEA
TDHI ISRTD/256 iTRANSMISSION DONE ISR ADDRESS
2428 OOCF TOLO (-256>*TDHI+ISRTD
2429
2430
2431
2432
2433
i
SEND A DATA FRAME TO AN INTELLIGENT PERIPHERAL SUBROUTINE
2434
2435
2436 EC8A A2 01
SENDIN: LDX
#$01