Technical information

Micro-KIM Users Manual
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CARD # LOC CODE CARD
581 ;
582 ;
584 *=$1C00
585 ;
586 ;
587 1C00 85 F3 SAVE STA ACC KIM ENTRY VIA STOP (NMI)
588 1C02 68 PLA OR BRK (IRQ)
589 1C03 85 F1 STA PREG
590 1C05 68 PLA KIM ENTRY VIA JSR (A LOST)
591 1C06 85 EF STA PCL
592 1C08 85 FA STA POINTL
593 1C0A 68 PLA
594 1C0B 85 F0 STA PCH
595 1C0D 85 FB STA POINTH
596 1C0F 84 F4 STY YREG
597 1C11 86 F5 STX XREG
598 1C13 BA TSX
599 1C14 86 F2 STX SPUSER
600 1C16 20 88 1E JSR INITS
601 1C19 4C 4F 1C JMP START
602 ;
603 1C1C 6C FA 17 NMIT JMP (NMIV) NON-MASKABLE INTERRUPT TRAP
604 1C1F 6C FE 17 IRQT JMP (IRQV) INTERRUPT TRAP
605 ;
606 1C22 A2 FF RST LDX #$FF KIM ENTRY VIA RST
607 1C24 9A TXS
608 1C25 86 F2 STX SPUSER
609 1C27 20 88 1E JSR INITS
610 ;
611 ;
612 1C2A A9 FF LDA #$FF COUNT START BIT
613 1C2C 8D F3 17 STA CNTH30 ZERO CNTH30
614 1C2F A9 01 LDA #$01 MASK HI ORDER BITS
615 1C31 2C 40 17 DET1 BIT SAD TEST
616 1C34 D0 19 BNE START KEYBD SSW TEST
617 1C36 30 F9 BMI DET1 START BIT TEST
618 1C38 A9 FC LDA #$FC
619 1C3A 18 DET3 CLC THIS LOOP COUNTS
620 1C3B 69 01 ADC #$01 THE START BIT TIME
621 1C3D 90 03 BCC DET2
622 1C3F EE F3 17 INC CNTH30
623 1C42 AC 40 17 DET2 LDY SAD CHECK FOR END OF START BIT
624 1C45 10 F3 BPL DET3
625 1C47 8D F2 17 STA CNTL30
626 1C4A A2 08 LDX #$08
627 1C4C 20 6A 1E JSR GET5 GET REST OF THE CHAR, TEST CHAR
628 ;
629 ;
630 ;
631 ;
632 ;
633 ;
634 ; MAKE TTY/KB SELECTION
635 ;
636 1C4F 20 8C 1E START JSR INIT1
637 1C52 A9 01 LDA #$01
638 1C54 2C 40 17 BIT SAD
639 1C57 D0 1E BNE TTYKB