mirror of
https://github.com/EranMorkon/AMTS.git
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56 lines
3.5 KiB
Plaintext
56 lines
3.5 KiB
Plaintext
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1 ;******************************************************************************
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2 ;* Z80 Assemblerprogramm *
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3 ;* Josef Reisinger *
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4 ;* josef.reisinger@htl-hl.ac.at *
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5 ;* 26/04/2015 *
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6 ;******************************************************************************
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7
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8
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9 ; ---------------------------- PIO 82C55 I/O ---------------------------------
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10 0080 PIO_A: EQU $80 ; (INPUT)
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11 0081 PIO_B: EQU $81 ; (OUTPUT) OUT TO LEDS
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12 0082 PIO_C: EQU $82 ; (INPUT) IN from DIP SWITCHES
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13 0083 PIO_CON: EQU $83 ; CONTROL BYTE PIO 82C55
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14
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15 ; --------------------------- CTC Z80 Timer Counter --------------------------
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16 0000 CTC0 EQU $00 ; Channel 0
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17 0001 CTC1 EQU $01 ; Channel 1
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18 0002 CTC2 EQU $02 ; Channel 2
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19 0003 CTC3 EQU $03 ; Channel 3
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20
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21 ; -------------------------- SIO (USART) ----------------------------------------
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22 0040 SIO_A_D: EQU $40 ; Channel A Data Register
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23 0041 SIO_B_D: EQU $41 ; Channel B Data Register
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24 0042 SIO_A_C: EQU $42 ; Channel A Control Register
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25 0043 SIO_B_C: EQU $43 ; Channel B Control Register
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26
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27
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28 ;-------------------------- CONSTANTS ----------------------------------------
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29 FFFF RAMTOP: EQU $FFFF ; 32Kb RAM 8000H-FFFFH
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30
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31
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32 ;******************************************************************************
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33 ;* START AFTER RESET, *
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34 ;* Function....: ready system and restart *
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35 ;******************************************************************************
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36 0000 ORG $0000
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37 0000 F3 DI ; Disable interrupt
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38 0001 31 FF FF LD SP,RAMTOP ; Set stack pointer to top off ram
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39 0004 3E 99 LD A,$99 ; PA0-PA7=IN (DIP SWITCHES), PB0-PB7=OUT (LEDS), PC0-PC7=IN, Mode 0 Selektion
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40 0006 D3 83 OUT (PIO_CON),A
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41 0008 DB 83 IN A,(PIO_CON)
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42 000A DB 80 AGAIN: IN A,(PIO_A) ; Read actual status of Switches (PA0-PA7)
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43 000C D3 81 OUT (PIO_B),A ; Output Status to LEDs (PB0-PB7)
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44 000E C3 0A 00 JP AGAIN ; Endless
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45
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46
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47
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Symbol table:
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AGAIN 000A CTC0 0000 CTC1 0001 CTC2 0002
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CTC3 0003 PIO_A 0080 PIO_B 0081 PIO_C 0082
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PIO_CON 0083 RAMTOP FFFF SIO_A_C 0042 SIO_A_D 0040
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SIO_B_C 0043 SIO_B_D 0041
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14 symbols
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