Mercurial > hg > Members > kono > os9 > sbc09
view os9/level1/clock.asm @ 56:4fa2bdb0c457
level vrbf and clock
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 23 Jul 2018 10:52:33 +0900 |
parents | fc10b7ae23d0 |
children |
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******************************************************************** * Clock - OS-9 Level One V2 Clock module * * $Id: clock.asm,v 1.1.1.1 2001/02/21 23:30:52 boisy Exp $ * * NOTE: This clock is TOTALLY VALID for ALL DATES between 1900-2155 * * Ed. Comments Who YY/MM/DD * ------------------------------------------------------------------ * 5 Tandy/Microware original version * 6 Modified to handle leap years properly for BGP 99/05/03 * 1900 and 2100 A.D. nam Clock ttl OS-9 Level One V2 Clock module ifp1 use defsfile endc tylg set Systm+Objct atrv set ReEnt+rev rev set $01 edition set $06 TimerPort set $e030 TkPerSec set 60 TkPerTS equ TkPerSec/10 ticks per time slice mod eom,name,tylg,atrv,ClkEnt,size size equ . name fcs /Clock/ fcb edition SysTbl fcb F$Time fdb FTime-*-2 fcb $80 ClockIRQ clra tfr a,dp ldx #TimerPort lda ,x bita #$10 beq L00B4 ldb #$8f start timer stb ,x L00B4 jmp [>D.SvcIRQ] ClkEnt equ * ldd #59*256+$01 last second and last tick std <D.Sec will prompt RTC read at next time slice * ldb #TkPerSec * stb <D.TSec set ticks per second ldb #TkPerTS get ticks per time slice stb <D.TSlice set ticks per time slice stb <D.Slice set first time slice pshs cc orcc #FIRQMask+IRQMask mask ints leax <ClockIRQ,pcr stx <D.IRQ * install system calls leay <SysTbl,pcr os9 F$SSvc ldx #TimerPort ldb #$8f start timer stb ,x puls pc,cc * F$Time system call code FTime ldx R$X,u ldy #TimerPort ldb #$04 stb ,y ldd 1,y std ,x ldd 3,y std 2,x ldd 5,y std 4,x clrb rts emod eom equ * end