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-
- title 'STATTIME as of october 20, 1980'
-
- ;
- ;
- ; Here is an interesting "patch" to Digital Research's
- ; STAT.COM, that incorporates a "real time clock display. This
- ; patch works with STAT.COM for CP/M version 2.2 ONLY. Merge
- ; it into STAT.COM as follows:
- ;
- ; A>DDT STAT.COM<cr>
- ; NEXT PC
- ; 1580 0100
- ; -ISTATTIME.HEX<cr>
- ; -R<cr>
- ; NEXT PC
- ; 16CD 0000
- ; -^C
- ; A>SAVE 22 STATTIME.COM<cr>
- ;
- ; Now you have a new "STAT" command file called STATTIME.COM,
- ; and it will display the "real time" on every execution...
- ;
- ; Best regards,
- ;
- ; Kelly Smith, MP/M-Net (tm) Sysop
- ; (805) 527-9321 (Modem, 300 Baud)
- ;
- ;
- ;
- ; STATTIME.ASM (revised 10/16/80)
- ;
- ; Revised from the May 1980, INTERFACE AGE MAGAZINE
- ;
- ; For Compu-Time T-102 TIME/DATE board (With MM 5375 AC)
- ;
- ; or,
- ;
- ; QT Computer Systems Inc. "Clock/Calendar +" board
- ;
- ;
- bdos equ 5
- pbuf equ 9
-
- stat equ 433h ; STAT.COM entry address
-
- cr equ 0dh ; ASCII carriage return
- lf equ 0ah ; ASCII line feed
-
- true equ -1 ; define true
- false equ not true; define false
- qt equ true ; define QT Computer Systems Clock/Calendar + board
- ct equ false ; Compu-Time Time/Date board
-
- if qt
-
- clock equ 080h ; real time clock base port address
-
- endif
-
- if ct
-
- clock equ 024h ; real time clock base port address
-
- endif
-
-
- org 0100h
-
- jmp date
-
- org 1501h ; version 2.2 stat.com entry address
-
- date: push psw ! push b ! push d ! push h
- lxi h,month ; point to month
- mvi d,8 ; select month tens digit
- call digit ; read and store high digit
- rlc ! rlc ! rlc ! rlc ; shift to high order hex digit
- mov b,a ; save in b reg.
- call digit ; read and store month units digit
- ora b ; or-in the units and tens digit
- mov b,a ; save the month in b reg.
- call digit ; read and store the day tens digit
- rlc ! rlc ! rlc ! rlc ; shift to high order hex digit
- mov c,a ; save in c reg.
- call digit ; read and store day units digit
- ora c ; or-in the units and tens digit
- mov c,a ; save the day in c reg.
-
- ;
- ; test the date, and convert it to four year calendar format
- ;
-
- cpi 031h ; 31st day?
- mov a,b ; get the month, for next test
- jnz m2 ; if not the 31st, test for february
- cpi 2 ; test for months < 31 days
- jz fix ; ...and fix if needed
- cpi 4
- jz fix
- cpi 6
- jz fix
- cpi 9
- jz fix
- cpi 011h
- jz fix
- m2: cpi 2 ; test for february
- jnz time ; if not february, then read time
- mov a,c ; get day for test
- cpi 029h ; is this the 29th day?
-
- ;
- ; insert two NOP's over previous instruction, if this is a leap year
- ;
- jz fix ; fix date...
- cpi 030h ; 30th day?
- jnz time ; if not the 29th or 30th, go read time
- fix: mvi a,41 ; select month units and fast set
- call rdigit ; read the month units digit
- mov b,a ; save in b reg.
- floop: in clock ; read the months unit digit
- cmp b ; test for digit changed
- jz floop ; wait until month is bumped (stable data)
- time: lxi h,hour ; point to hour
- mvi d,0 ; select hour tens digit
- call ddigit ; read hour tens and units
- inx h ; step over ":"
- call ddigit ; read minutes tens and units
- inx h ; step over ":"
- call ddigit ; read second tens and units
- lxi d,pdate ; point to date and time message
- mvi c,pbuf ; print buffer function
- call bdos ; let CP/M do the work...
- lda month ; get high byte of the month
- cpi ' ' ; in the range of january to september?
- jz jansept
- lda month+1 ; must be october to december...
- cpi '0' ; october?
- lxi d,oct
- jz pmonth ; print, if so
- cpi '1' ; november?
- lxi d,nov
- jz pmonth ; print, if so
- lxi d,dec ; december.
- jmp pmonth ; print it...
- jansept:lda month+1 ; it's january to september
- cpi '1' ; january?
- lxi d,jan
- jz pmonth ; print, if so
- cpi '2' ; february?
- lxi d,feb
- jz pmonth ; print, if so
- cpi '3' ; march?
- lxi d,mar
- jz pmonth ; print, if so
- cpi '4' ; april?
- lxi d,apr
- jz pmonth ; print, if so
- cpi '5' ; may?
- lxi d,may
- jz pmonth ; print, if so
- cpi '6' ; june?
- lxi d,jun
- jz pmonth ; print month
- cpi '7' ; july?
- lxi d,jul
- jz pmonth ; print, if so
- cpi '8' ; august?
- lxi d,aug
- jz pmonth ; print, if so
- lxi d,sep ; it's september
- pmonth: mvi c,pbuf ; print buffer function
- call bdos ; let CP/M do the work...
- done: lxi d,day ; get the day
- mvi c,pbuf ; print buffer function
- call bdos ; let CP/M do the work...
- pop h ! pop d ! pop b ! pop psw
- jmp stat ; now jump into STAT...
-
- ddigit: call digit ; read and store two digits
- digit: mov a,d ; move digit select code to a reg.
- call rdigit ; read a clock digit
- cpi 0ffh ; test for board present
- jz nobrd ; go print error message
- ori 030h ; convert digit to ASCII
- cpi 03fh ; test for blanked leading zero
- jnz store ; go store digit, if not blanked
- mvi a,020h ; convert to a blank
- store: mov m,a ; store the digit in message buffer
- inx h ; bump message pointer buffer location
- inr d ; step to next digit
- ani 00fh ; mask off high ASCII nibble
- ret ; return with digit in a reg.
-
- nobrd: pop h ; adjust the stack
- lxi d,errmsg; point to the error message
- jmp done ; print error message, and exit to CP/M
-
- rdigit: out clock ; select digit
- mvi a,0 ; ...some delay time for settling
- dloop: dcr a
- jnz dloop
- in clock ; read a digit
- ret ; return with digit in a reg.
-
- ;
- ; message buffers
- ;
-
- pdate: db cr,lf,'Date: $'
- month: ds 2 ; the month
- day: db 'xx, ' ; the day...
- db '1980' ; the year...
- db ' Time: '
- hour: db 'xx:' ; the hour...
- db 'xx:' ; the minute...
- db 'xx' ; the second...
- db cr,lf,'$' ; string delimeter
-
- errmsg: db cr,lf,'The Clock Board is NOT INSTALLED!',cr,lf,'$'
-
- jan: db 'January $'
- feb: db 'February $'
- mar: db 'March $'
- apr: db 'April $'
- may: db 'May $'
- jun: db 'June $'
- jul: db 'July $'
- Aug: db 'August $'
- sep: db 'September $'
- oct: db 'October $'
- nov: db 'November $'
- dec: db 'December $'
-
- end
-
-