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31
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1 *********************************************
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2 * Rdisk
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3 * A driver for a Ram disk!
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4 * Modified for os9l1 emulator by Soren Roug 2001
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5 *
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6
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7 nam Pdisk
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8 ttl A Device Driver for a RAM Disk
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9
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10 ifp1
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11 use os9defs
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12 use rbfdefs
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13 endc
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14
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15 ***********************
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16 * Edition History
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17
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18 * # date Comments
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19 * -- -------- ----------------------------------------------
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20
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21 Revision equ 1
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22 NumDrvs set 2 Number of drives
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23
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24 org Drvbeg
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25 rmb NumDrvs*DrvMem
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26 RAMSTA equ .
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27
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28 mod RAMEND,RAMNAM,Drivr+Objct,Reent+Revision,RAMENT,RAMSTA
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29 fcb $FF mode byte
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30
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31 RAMNAM fcs /Pdisk/
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32
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33 RAMENT lbra INIT
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34 lbra READ
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35 lbra WRITE
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36 lbra GETSTA
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37 lbra PUTSTA
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38 lbra TERM
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39
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40 *****************************
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41 * INIT
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42 * Set up the v09 disk
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43
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44 INIT ldb #NumDrvs Set no drives to 2
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45 * Setup drive tables
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46 stb V.NDRV,u save it
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47 lda #$FF
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48 leax DRVBEG,u point to drive table start
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49 L0111 sta DD.TOT+1,x
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50 sta <V.TRAK,x
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51 leax <DRVMEM,x
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52 decb
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53 bne L0111
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54 clrb
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55 INITXIT rts
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56
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57 SETUPDT lda <PD.DRV,y Get the drive number
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58 ldu V.PORT,u
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59 sta 1,u drive number
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60 stb 2,u msb of lsn
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61 tfr x,d
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62 sta 3,u
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63 stb 4,u
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64 ldd PD.BUF,y
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65 sta 5,u buffer address
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66 stb 6,u
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67 rts
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68
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69 *****************************
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70 * READ
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71 * read a sector from disk
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72 * Entry: U = Static Storage
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73 * Y = Path Descriptor
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74 * B = MSB of LSN
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75 * X = LSB's of LSN
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76 * Exit: 256 byte sector in PD.BUF buffer
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77 *
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78 READ bsr SETUPDT
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79 lda #$81
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80 sta ,u // perform io
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81 ldb ,u // return status
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82 rts
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83
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84 *****************************
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85 * WRITE
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86 * Write a sector to disk
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87 * Entry: U = Static Storage
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88 * Y = Path Descriptor
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89 * B = MSB of LSN
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90 * X = LSB's of LSN
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91 * PD.Buf = Sector to write
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92 *
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93 WRITE bsr SETUPDT
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94 lda #$55
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95 sta ,u // perform io
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96 ldb ,u // return status
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97 WRIT99 rts
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98
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99 **************************
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100 * GETSTA
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101 * get device status
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102 *
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103 GETSTA
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104 Unknown comb
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105 clrb
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106 rts
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107
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108 **************************
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109 * PUTSTA
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110 * Set device Status
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111 *
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112 PUTSTA
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113 PUTSTA90 clrb
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114 rts
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115
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116 *****************************
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117 * TERM
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118 * terminate Driver
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119 *
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120 TERM clrb
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121 rts
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122
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123 emod
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124 RAMEND equ *
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125
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