cseg segment para public''code''
org 100h
alarm proc far
; Memory-resident program to intercept the timer interrupt and display the
; System time in the upper right-hand corner of the display.
; This program is run as''ALARM hh: mm x'', where hh: mm is the alarm time and
; X is''-'' to turn the display off. Any other value of x or no value will
; Turn the clock on
intaddr equ 1ch * 4; interrupt address
segaddr equ 62h * 4; segment address of first copy
mfactor equ 17478; minute conversion factor backup bin bin_old conf config crawler.tar.gz crawler_bin.tar.gz data eshow eshow_sitemap.html generate.sh google.html google.html.md5 log maint news: 10 news: 11 news: 12 news : 13 news: 14 news: 15 news: 16 news: 17 news: 18 news: 2 news: 3 news: 4 news: 5 news: 6 news: 7 news: 8 news: 9 outboundLinksMgr.sql seeds sitemap.html svn tasks tmp xml2dict-2008.6-tar.gz xml2dict-read-only 16
whozat equ 1234h; signature
color equ 14h; color attribute
assume cs: cseg, ds: cseg, ss: nothing, es: nothing
jmp p150; start-up code
jumpval dd 0; address of prior interrupt
signature dw whozat; program signature
state db 0;''-'' = off, all else = on
wait dw 18; wait time - 1 second or 18 ticks
hour dw 0; hour of the day
atime dw 0ffffh; minutes past midnite for alarm
acount dw 0; alarm beep counter - number of seconds (5)
atone db 5; alarm tone - may be from 1 to 255 - the
; Higher the number, the lower the frequency
aleng dw 8080h; alarm length (loop count) may be from 1-FFFF
dhours dw 0; display hours
db'':''
dmins dw 0; display minutes
db'':''
dsecs dw 0; display seconds
db''-''
ampm db 0;''A''or''P''for am or pm
db''m''
tstack db 16 dup (''stack''); temporary stack
estack db 0; end of stack
holdsp dw 0; original sp
holdss dw 0; original ss
p000:; interrupt code
push ax; save registers
push ds
pushf
push cs
pop ds; make ds = cs
mov ax, wait; check wait time
dec ax; zero?
jz p010; yes - 1 second has elapsed
mov wait, ax; not this time
jmp p080; return
p010: cli; disable interrupts
mov ax, ss; save stack
mov holdss, ax
mov holdsp, sp
mov ax, ds
mov ss, ax; point to internal stack
mov sp, offset estack
sti; allow interrupts
push bx; save other registers
push cx
push dx
push es
push si
push di
push bp
mov ax, 18; reset wait time
mov wait, ax
mov al, state; are we disabled?
cmp al ,''-''
jnz p015; no
jmp p070
p015: mov ah, 0; read time
int 1ah; get time of day
mov ax, dx; low part
mov dx, cx; high part
mov cl, 4
shl dx, cl; multiply by 16
mov bx, ax
mov cl, 12
shr bx, cl; isolate top 4 bits of ax
add dx, bx; now in upper
mov cl, 4
shl ax, cl; multiply by 16
mov bx, mfactor; compute minutes
div bx; minutes in ax, remainder in dx
cmp ax, atime; time to sound the alarm?
jnz p020; no
call p100; yes - beep the speaker twice
push ax
mov ax, acount; get beep count
dec ax; down by 1
mov acount, ax; save beep count
cmp ax, 0; is it zero?
jnz p018; no - keep alarm on
mov ax, 0ffffh; turn off alarm
mov atime, ax
p018: pop ax
p020: mov dsecs, dx; save remainder
mov bx, 60; compute hours
xor dx, dx; zero it
div bx; hours in ax, minutes in dx
mov dmins, dx; save minutes
cmp ax, 0; midnight?
jnz p030; no
mov ax, 12; yes
jmp p040a; set am
p030: cmp ax, 12; before noon?
jb p040a; yes - set am
jz p040p; noon - set pm
sub ax, 12; convert the rest
p040p: mov bl,''p''
jmp p040x
p040a: mov bl,''a''
p040x: mov ampm, bl
aam; fix up hour
cmp ax, hour; top of the hour?
jz p060; no
mov hour, ax
call p120; beep the speaker once
p060: add ax, 3030h; convert hours to ascii
xchg ah, al
mov dhours, ax
mov ax, dmins; get minutes
aam
add ax, 3030h; convert to ascii
xchg ah, al
mov dmins, ax
mov ax, dsecs; get seconds (remainder)
xor dx, dx
mov bx, 60
mul bx
mov bx, mfactor
div bx; seconds in ax
aam
add ax, 3030h
xchg ah, al
mov dsecs, ax
xor ax, ax; check monitor type
mov es, ax
mov ax, es: [410h]; get config byte
and al, 30h; isolate monitor type
cmp al, 30h; color?
mov ax, 0b000h; assume mono
jz p061; its mono
mov ax, 0b800h; color screen address
p061: mov dx, es: [463h]; point to 6845 base port
add dx, 6; point to status port
mov es, ax; point to monitor
mov bh, color; color in bh
mov si, offset dhours; point to time
mov di, 138; row 1, col 69
cld
mov cx, 11; loop count
p062: mov bl, [si]; get next character
p063: in al, dx; get crt status
test al, 1; is it low?
jnz p063; no - wait
cli; no interrupts
p064: in al, dx; get crt status
test al, 1; is it high?
jz p064; no - wait
mov ax, bx; move color & character
stosw; move color & character again
sti; interrupts back on
inc si; point to next character
loop p062; done?
p070: pop bp; restore registers
pop di
pop si
pop es
pop dx
pop cx
pop bx
cli; no interrupts
mov ax, holdss
mov ss, ax
mov sp, holdsp
sti; allow interrupts
p080: popf
pop ds
pop ax
jmp cs: [jumpval]
p100 proc near; beep the speaker twice
call p120
push cx
mov cx, 20000
p105: loop p105; wait around
pop cx
call p120
push cx
mov cx, 20000
p106: loop p106; wait around
pop cx
call p120
ret
p100 endp
p120 proc near; beep the speaker once
push ax
push cx
mov al, 182
out 43h, al; setup for sound
mov al, 0
out 42h, al; low part
mov al, atone; get alarm tone
out 42h, al; high part
in al, 61h
push ax; save port value
or al, 3
out 61h, al; turn speaker on
mov cx, aleng; get loop count
p125: loop p125; wait around
pop ax; restore original port value
out 61h, al; turn speaker off
pop cx
pop ax
ret
p120 endp
p150:; start of transient code
mov dx, offset copyr
call p220; print copyright
mov ax, 0
mov es, ax; segment 0
mov di, segaddr +2; this program''s prior location
mov ax, es: [di]; get prior code segment
mov es, ax; point to prior program segment
mov di, offset signature
mov cx, es: [di]; is it this program?
cmp cx, whozat
jnz p160; no - install it
call p200; set state & alarm
int 20h; terminate
p160: mov di, segaddr +2; point to int 62h
mov ax, 0
mov es, ax; segment 0
mov ax, ds; get current ds
mov es: [di], ax; set int 62h
mov si, offset jumpval
mov di, intaddr; point to timer interrupt
mov bx, es: [di]; get timer ip
mov ax, es: [di +2]; and cs
mov [si], bx; save prior ip
mov [si +2], ax; and cs
mov bx, offset p000
mov ax, ds
cli; clear interrupts
mov es: [di], bx; set new timer interrupt
mov es: [di +2], ax
sti; set interrupts
push ds
pop es
call p200; set state & alarm
mov dx, offset p150; last byte of resident portion
inc dx
int 27h; terminate
p200 proc near; set state & alarm
mov si, 80h; point to command line
mov ax, 0
mov di, 0ffffh; init hours
mov bh, 0
mov ch, 0
mov dh, 0;: counter
mov es: [state], bh; turn clock on
mov cl, [si]; get length
jcxz p210; it''s zero
p203: inc si; point to next char
mov bl, [si]; get it
cmp bl ,''-''; is it a minus?
jnz p204; no
mov es: [state], bl; turn clock off
push dx
mov dx, offset msg3; print msg
call p220
pop dx
jmp p206
p204: cmp dh, 2; seen 2nd colon?
jz p206; yes - ignore seconds
cmp bl ,'':''; colon?
jnz p205; no
inc dh
cmp dh, 2; second colon?
jz p206; yes - ignore seconds
push cx
push dx
mov cx, 60
mul cx; multiply current ax by 60
pop dx
pop cx
mov di, ax; save hours
mov ax, 0
jmp p206
p205: cmp bl,''0''
jb p206; too low
cmp bl,''9''
ja p206; too high - can be a problem
sub bl,''0''; convert it to binary
push cx
push dx
mov cx, 10
mul cx; multiply current value by 10
add ax, bx; and add latest digit
pop dx
pop cx
p206: loop p203; done yet?
cmp di, 0ffffh; any time to set?
jz p210; no
add ax, di; add hours
cmp ax, 24 * 60
jb p209; ok
mov dx, offset msg1; print error message
call p220
jmp p210
p209: mov es: [atime], ax; save minutes past midnight
mov ax, 5
mov es: [acount], ax; set alarm count
mov dx, offset msg2; print set msg
call p220
p210: ret
p200 endp
p220 proc near; print message
push ax
mov ah, 9
int 21h
pop ax
ret
p220 endp
copyr db''Alarm - Clock'', 10,13 ,''$''
msg1 db''Invalid time - must be from 00:00 to 23:59'', 10,13 ,''$''
msg2 db''Resetting alarm time'', 10,13 ,''$''
msg3 db''Turning clock display off'', 10,13 ,''$''
alarm endp
cseg ends
end alarm
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