NAM INTCLK
* CLOCK PROGRAM FOR MP-T INTERRUPT TIMER
* DISPLAYS TIME IN 12 HOUR FORMAT 12:24.56
*
* MEMORY ADDRESS $A002 AND $A003 HOLD ADDRESS
* OF THE MP-T PORT, DEFAULT IS #5 OR $8010
*
* ADDRESS $A000 AND $A001 MUST BE LOADED WITH
* INTERUPT SREVICE ROUTINE WHICH IS $013D
*
* NOV 2022, M. DOUGLAS - FIXED THE SWAPPED
* VALUES AT $A000 AND $A002 AT THE END OF
* THIS PROGRAM

       ORG $0100
       SEI
       LDS #$A042 
       LDX #$0020
       JSR PDATA1
       LDX #$0060
       JSR PDATA1
       LDX #$0061
       LDAA #$0D
       JSR OUTEEE
LOOP1  JSR INEEE
       STAA 0,X
       CPX #$0068
       BEQ CONFIG
       INX
       BRA LOOP1
CONFIG LDX $A002
       LDAA #$FF
       STAA 2,X
       LDAA #$3D
       STAA 3,X
       LDAA #$80
       STAA 2,X
       LDAA #$06
       STAA 2,X
       NOP
       CLI
LOOP2  NOP
       BRA LOOP2

INTSER LDX $A002
       LDAA 2,X
       LDX #$0060
       LDAA #$39
       LDAB #$30
       CMPA 8,X
       BEQ SKIP2
       INC 8,X
       BRA DISPLY
SKIP2  STAB 8,X
       LDAA #$35
       CMPA 7,X
       BEQ SKIP3
       INC 7,X
       BRA DISPLY
SKIP3  STAB 7,X
       LDAA #$39
       CMPA 5,X
       BEQ SKIP4
       INC 5,X
       BRA DISPLY
SKIP4  STAB 5,X
       LDAA #$35
       CMPA 4,X
       BEQ SKIP5
       INC 4,X
       BRA DISPLY
SKIP5  STAB 4,X
       LDAA #$32
       LDAB #$39
       CMPA 2,X
       BEQ SKIP6
       CMPB 2,X
       BEQ SKIP8
       INC 2,X
       BRA DISPLY
SKIP6  LDAA #$31
       CMPA 1,X
       BEQ SKIP7
       INC 2,X
       BRA DISPLY
SKIP7  STAA 2,X
       LDAB #$20
       STAB 1,X
       BRA DISPLY
SKIP8  LDAA #$30
       LDAB #$31
       STAA 2,X
       STAB 1,X
DISPLY LDX #$0060
       JSR PDATA1 
       RTI

       ORG $0020
       FCB $10,$16,$0D,$00,$00,$00
       FCC /SWTPC 6800 COMPUTER SYSTEM TIME:/
       FCB $0D,$0A,$00,$00,$00,$04

       ORG $0060
       FCB $0D
       FCC /HH:MM.SS /
       FCB $04
       
       ORG $A048
       FDB $0100

       ORG $A000
       FDB $013D
       
       ORG $A002
       FDB $8010

INEEE  EQU $E1AC
PDATA1 EQU $E07E
OUTEEE EQU $E1D1

       END