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1 ********************************************************************
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2 * Clock - OS-9 Level One V2 Clock module
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3 *
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4 * $Id: clock.asm,v 1.1.1.1 2001/02/21 23:30:52 boisy Exp $
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5 *
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6 * NOTE: This clock is TOTALLY VALID for ALL DATES between 1900-2155
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7 *
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8 * Ed. Comments Who YY/MM/DD
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9 * ------------------------------------------------------------------
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10 * 5 Tandy/Microware original version
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11 * 6 Modified to handle leap years properly for BGP 99/05/03
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12 * 1900 and 2100 A.D.
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13
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14 nam Clock
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15 ttl OS-9 Level One V2 Clock module
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16
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17 ifp1
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11
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18 use defsfile
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7
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19 endc
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20
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21 tylg set Systm+Objct
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22 atrv set ReEnt+rev
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23 rev set $01
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24 edition set $06
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53
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25 TimerPort set $ffb0
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7
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26
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27 mod eom,name,tylg,atrv,ClkEnt,size
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28
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29 size equ .
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30
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31 name fcs /Clock/
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32 fcb edition
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33
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34 SysTbl fcb F$Time
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35 fdb FTime-*-2
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53
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36 fcb F$STime
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37 fdb FSTime-*-2
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38 fcb $80
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39
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40
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53
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41 ClockIRQ ldx #TimerPort
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42 lda ,x
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43 bita #$10
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44 beq L00AE
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45 lda #$8f
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46 sta >TimerPort
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7
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47 L00AE jsr [>D.Poll]
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48 bcc L00AE
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53
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49 L00B4 jsr [>D.AltIRQ]
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50 rti
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7
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51
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52 ClkEnt equ *
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53 pshs cc
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54 orcc #FIRQMask+IRQMask mask ints
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55 leax >ClockIRQ,pcr
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56 stx <D.IRQ
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57 * install system calls
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58 leay >SysTbl,pcr
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59 os9 F$SSvc
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60 ldx #TimerPort
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61 ldb #$8f start timer
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62 stb ,x
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63 puls pc,cc
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64
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65 * F$Time system call code
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66 FTime ldx #TimerPort
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67 ldb #$04
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68 stb ,x
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69 leax 1,x Address of system time packet
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70 RetTime ldy <D.Proc Get pointer to current proc descriptor
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71 ldb P$Task,y Process Task number
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72 lda <D.SysTsk From System Task
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73 ldu R$X,u
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74 STime.Mv ldy #6 Move 6 bytes
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75 FMove os9 F$Move
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76 rts
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77
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78 FSTime clrb
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7
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79 rts
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80
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81 emod
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82 eom equ *
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83 end
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