home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
CP/M
/
CPM_CDROM.iso
/
cpm
/
nubye
/
nuc-kp4.ins
< prev
next >
Wrap
Text File
|
1994-07-13
|
2KB
|
80 lines
; NUC-KP4.INS - KayPro 4-84 & KayPro 10 - 04/21/86
;
; This insert is for the Kaypro standard internal clock.
;
; Note: This is an insert, not an overlay.
;
; ========
; 04/21/86 Modified for NUBYE
; 07/15/86 First version based upon code found in TIMEx.ASM - Wayne Masters
; ========
;
; Use the program TIMEx.ASM to initialize your clock with correct date/time
; prior to running NUBYE.
;
;
CENTURY EQU 19H ; 19h = 19 bcd, reset this every 100 years
CYEAR EQU 85H ; 85h = 85 bcd, reset this every year
RTCA EQU 20H ; Clock address select reg
RTCD EQU 24H ; Clock data register
RTCS EQU 22H ; Clock status register
REGEND EQU 8 ; Ending register count for time loop
;
TIME: MVI A,0CFH ; Initial status setup byte
OUT RTCS ; Set pio for mode 3 in/output
MVI A,0E0H ; Low 5 bits output, top 3 input
OUT RTCS ; Set pio in/out bits
MVI A,3 ; Disable interrupts
OUT RTCS ; Do it
MVI A,14H ; Status reg addr
OUT RTCA ; Select it
IN RTCD ; Reset status bit
;
DOREAD: LXI H,LOCBUF ; Point to time save area
MVI B,2 ; Start with seconds
;
BURST: MOV A,B ; A is register we want to read
CPI REGEND ; Gotten all we want?
JNC ROLLCK ; Yes, done getting time
OUT RTCA ; Select that register of clock
IN RTCD ; Read the clock data
MOV M,A ; Save in core
INX H ; Next memory location
INR B ; Next reg addr
JMP BURST ; Go get more data
;
; See if the clock rolled over during the reads.
;
ROLLCK: MVI A,14H ; Status reg addr
OUT RTCA ; Select it
IN RTCD ; Get status
ORA A ; Was clock roll?
JNZ DOREAD ; Yes, go read again
;
; Format the date and time for bye's realtime clock buffer
;
LDA LOCBUF ; BCD seconds
STA RTCBUF+2
LDA LOCBUF+1 ; BCD minutes
STA RTCBUF+1
CALL BCDBIN ; Convert to binary
STA CCMIN ; For NUBYE
LDA LOCBUF+2 ; BCD hours
STA RTCBUF
CALL BCDBIN ; Convert to binary
STA CCHOUR ; For NUBYE
LDA LOCBUF+4 ; BCD day of month
STA RTCBUF+6
LDA LOCBUF+5 ; BCD month
STA RTCBUF+5
MVI A,CENTURY
STA RTCBUF+3
MVI A,CYEAR
STA RTCBUF+4
RET ; All done
;
LOCBUF: DB 0,0,0,0,0,0 ; Seconds, Minutes, Hours,
; Day of weekk, Day of month, Month of year
;
; end of insert
; -------------