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31
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1
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2 * miscellaneous definitions
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3 HResMaxX equ 639 high resolution X limit
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4 HResMaxY equ 191 high resolution Y limit
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5 MousData equ $0008 arbitrary choice for mouse data area ($0008-$000F)
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6 PcktSize equ 5 number of bytes in mouse data packet
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7 SyncData equ %10000000 initial mouse data byte pattern
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8 SyncMask equ %11111000 mask for initial mouse data byte pattern
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9
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10 * 6551 register definitions
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11 org 0
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12 DataReg rmb 1 receive/transmit data
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13 StatReg rmb 1 IRQ/DSR/DCD/error status (read only)
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14 PRstReg equ StatReg programmed reset (write only)
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15 CmdReg rmb 1 command (parity/echo/Tx IRQ/Rx IRQ/DTR)
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16 CtrlReg rmb 1 control (stop bits/word length/Rx clock/baud rate)
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17
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18 * Status bit definitions
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19 Stat.IRQ equ %10000000 IRQ occurred
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20 Stat.DSR equ %01000000 current DSR input level (0=enabled, 1=disabled)
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21 Stat.DCD equ %00100000 current DCD input level (0=enabled, 1=disabled)
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22 Stat.TxE equ %00010000 Tx register empty
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23 Stat.RxF equ %00001000 Rx register full
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24 Stat.Ovn equ %00000100 overrun error
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25 Stat.Frm equ %00000010 framing error
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26 Stat.Par equ %00000001 parity error
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27
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28 Stat.Err equ Stat.Ovn!Stat.Frm!Stat.Par status error bits
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29 Stat.Flp equ $00 all status bits active when set
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30 Stat.Msk equ Stat.RxF!Stat.Ovn!Stat.Frm!Stat.Par active IRQ bits
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31
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32 * Command bit definitions
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33 Cmd.Par equ %11100000 see parity table below
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34 Cmd.Echo equ %00010000 Rx echo (0=disabled, 1=enabled)
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35 Cmd.TxIC equ %00001100 see Tx IRQ control table below
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36 Cmd.RxIE equ %00000010 Rx IRQ enable (0=enabled, 1=disabled)
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37 Cmd.DTR equ %00000001 DTR output (0=disabled, 1=enabled)
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38
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39 * parity table
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40 Par.None equ %00000000
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41 Par.Odd equ %00100000
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42 Par.Even equ %01100000
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43 Par.Mark equ %10100000
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44 Par.Spac equ %11100000
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45
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46 * Tx IRQ control table
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47 TIC.Off equ %00000000 RTS disabled, Tx IRQ disabled
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48 TIC.On equ %00000100 RTS enabled, Tx IRQ enabled
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49 TIC.RTS equ %00001000 RTS enabled, Tx IRQ disabled
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50 TIC.Brk equ %00001100 RTS enabled, Tx line break
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51
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52 * Control bit definitions
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53 Ctl.Stop equ %10000000 stop bits (clear=1, set=2)
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54 Ctl.DBit equ %01100000 see data bit table below
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55 Ctl.RClk equ %00010000 Rx clock source (0=external, 1=internal)
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56 Ctl.Baud equ %00001111 see baud rate table below
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57
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58 * data bit table
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59 DB.5 equ %01100000 five data bits per character
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60 DB.6 equ %01000000 six data bits per character
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61 DB.7 equ %00100000 seven data bits per character
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62 DB.8 equ %00000000 eight data bits per character
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63
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64 * baud rate table
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65 org 0
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66 BR.ExClk rmb 1 16x external clock
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67 BR.00050 rmb 1 50 baud
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68 BR.00075 rmb 1 75 baud
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69 BR.00110 rmb 1 109.92 baud
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70 BR.00135 rmb 1 134.58 baud
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71 BR.00150 rmb 1 150 baud
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72 BR.00300 rmb 1 300 baud
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73 BR.00600 rmb 1 600 baud
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74 BR.01200 rmb 1 1200 baud
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75 BR.01800 rmb 1 1800 baud
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76 BR.02400 rmb 1 2400 baud
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77 BR.03600 rmb 1 3600 baud
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78 BR.04800 rmb 1 4800 baud
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79 BR.07200 rmb 1 7200 baud
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80 BR.09600 rmb 1 9600 baud
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81 BR.19200 rmb 1 19200 baud
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82
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83 * Btn.Cntr bit definitions
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84 BC.Butn1 equ %00100000 button #1 (left, 1 = pressed)
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85 BC.Butn2 equ %00010000 button #2 (middle, 1 = pressed)
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86 BC.Butn3 equ %00001000 button #3 (right, 1 = pressed)
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87 BC.RxCnt equ %00000111 Rx data counter
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88
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89 BC.Butns equ BC.Butn1!BC.Butn2!BC.Butn3 mask for all buttons
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90
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91
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92 * mouse static data area definitions
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93 org 0
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94 Btn.Cntr rmb 1 mouse button status and Rx data counter
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95 Buffer rmb 3 Rx buffer for 1st 3 bytes of XY mouse data (must start at 1,u)
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96 CrntXPos rmb 2 mouse X position (0 to HResMaxX)
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97 CrntYPos rmb 2 mouse Y position (0 to HResMaxY*2)
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98
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