mirror of
https://github.com/EranMorkon/AMTS.git
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81 lines
5 KiB
Plaintext
81 lines
5 KiB
Plaintext
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1 ;******************************************************************************
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2 ;* Z80 Assembler program *
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3 ;* Josef Reisinger *
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4 ;* josef.reisinger@htl-hl.ac.at *
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5 ;* 10/07/2017 *
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6 ;******************************************************************************
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7
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8 ; ---------------------------- PIO 82C55 I/O ---------------------------------
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9 0080 PIO_A: EQU $80 ; (INPUT)
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10 0081 PIO_B: EQU $81 ; (OUTPUT) OUT TO LEDS
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11 0082 PIO_C: EQU $82 ; (INPUT) IN from DIP SWITCHES
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12 0083 PIO_CON: EQU $83 ; CONTROL BYTE PIO 82C55
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13
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14 ; --------------------------- CTC Z80 Timer Counter --------------------------
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15 0000 CTC0 EQU $00 ; Channel 0
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16 0001 CTC1 EQU $01 ; Channel 1
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17 0002 CTC2 EQU $02 ; Channel 2
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18 0003 CTC3 EQU $03 ; Channel 3
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19
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20 ; -------------------------- SIO (USART) ----------------------------------------
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21 0040 SIO_A_D: EQU $40 ; Channel A Data Register
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22 0041 SIO_B_D: EQU $41 ; Channel B Data Register
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23 0042 SIO_A_C: EQU $42 ; Channel A Control Register
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24 0043 SIO_B_C: EQU $43 ; Channel B Control Register
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25
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26
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27 ;-------------------------- CONSTANTS ----------------------------------------
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28 FFFF RAMTOP: EQU $FFFF ; 32Kb RAM 8000H-FFFFH
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29 8000 COUNTER: EQU $8000 ; RAM Counter
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30
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31 ;******************************************************************************
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32 ;* RESET HANDLER *
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33 ;* Function: Initalize system and start Main Programm *
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34 ;******************************************************************************
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35 0000 ORG $0000
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36 0000 F3 DI ; Disable interrupt
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37 0001 31 FF FF LD SP,RAMTOP ; Set stack pointer
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38 0004 C3 00 01 JP MAIN ; jump to Main program
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39
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40
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41 ;*******************************************************************
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42 ;* MAIN PROGRAM *
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43 ;*******************************************************************
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44 0100 ORG $100
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45 0100 3E 99 MAIN: LD A,$99 ; Initialize 8255: PA0-PA7=IN (DIP SWITCHES), PB0-PB7=OUT (LEDS),
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46 0102 D3 83 OUT (PIO_CON),A ; PC0-PC7=IN, Mode 0 Selection
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47 0104 3E 01 LD A,$01 ; Initialize RAM Counter
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48 0106 21 00 80 LD HL,COUNTER ; Load RAM Counter Address
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49 0109 77 LD (HL),A ; Store Counter in RAM cell
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50 010A 7E AGAIN: LD A,(HL) ; Load RAM Counter
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51 010B D3 81 OUT (PIO_B),A ; Output RAM Counter to LEDs (PB0-PB7)
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52 010D 34 INC (HL) : Increment RAM Counter
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53 010E CD 14 01 CALL _WAIT
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54 0111 C3 0A 01 JP AGAIN ; Endless
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55
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56
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57
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58 ;*******************************************************************
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59 ;* Warteschleife 0,5s *
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60 ;*******************************************************************
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61 0114 16 FF _WAIT: LD D,$FF ;
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62 0116 1E FF _OUTER: LD E,$FF ;
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63 0118 1D _INNER: DEC E
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64 0119 C2 18 01 JP NZ,_INNER
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65 011C 15 DEC D
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66 011D C2 16 01 JP NZ,_OUTER
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67 0120 C9 RET
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68
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69
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70
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71
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72
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Symbol table:
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AGAIN 010A COUNTER 8000 CTC0 0000 CTC1 0001
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CTC2 0002 CTC3 0003 MAIN 0100 PIO_A 0080
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PIO_B 0081 PIO_C 0082 PIO_CON 0083 RAMTOP FFFF
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SIO_A_C 0042 SIO_A_D 0040 SIO_B_C 0043 SIO_B_D 0041
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_INNER 0118 _OUTER 0116 _WAIT 0114
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19 symbols.
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