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| -rw-r--r-- | CLOCK.sic | 97 | ||||
| -rw-r--r-- | readme.md | 1 |
2 files changed, 98 insertions, 0 deletions
diff --git a/CLOCK.sic b/CLOCK.sic new file mode 100644 index 0000000..2b048ea --- /dev/null +++ b/CLOCK.sic @@ -0,0 +1,97 @@ +CLOCK START 7EEE #count backwards from 7FFD after program is finished + LDA TIMER + STA SAVED + LDA ZEROB #load 1 byte of zero into A + STA HOUR #store 00 into HOUR and MINUTE + STA MINUTE + LDA SAVED + COMP ZERO + JGT CALC1 #greater than zero means 12 hour format...jump to the calculation +ADJUST AND SEVENF #Do AND operation with the value in SAVED and 7FFFFF +CALC2 COMP HCOUNT #calculation for 24 hour format + JLT CALC2A + SUB HCOUNT + STA STORE #add one to HOUR: + LDA HOUR #load HOUR into A + ADD ONE #add one + STA HOUR #store new value in HOUR + LDA STORE #load the time back into A + COMP HCT2 + JGT CALC2 +CALC2A COMP MCOUNT + JLT DISP24 + SUB MCOUNT + STA STORE #add one to minute + LDA MINUTE + ADD ONE + STA MINUTE + LDA STORE + COMP MCT2 + JGT CALC2A + J DISP24 +CALC1 COMP HCOUNT #calculation for 12 hour format + JLT CALC1A + SUB HCOUNT + STA STORE #add one to hour + LDA HOUR + ADD ONE + STA HOUR + LDA STORE + COMP HCT2 + JGT CALC1 +CALC1A COMP MCOUNT + JLT DISP12 + SUB MCOUNT + STA STORE #add one to minute + LDA MINUTE + ADD ONE + STA MINUTE + LDA STORE + COMP MCT2 + JGT CALC1A + J DISP12 +DISP24 TD OUTPUT #test if device is ready to be written to + JEQ DISP24 #loop until the device is ready + LDCH HOUR + WD OUTPUT + LDCH MINUTE + WD OUTPUT + J ENDING +DISP12 TD OUTPUT #test if device is ready to be written to + JEQ DISP24 #loop until device is ready + LDA HOUR + COMP TWELVE + JGT PM + LDCH HOUR +AM WD OUTPUT + LDCH MINUTE + WD OUTPUT + LDCH A + WD OUTPUT + J ENDING +PM SUB TWELVE + LDCH HOUR + WD OUTPUT + LDCH MINUTE + WD OUTPUT + LDCH P + WD OUTPUT + J ENDING +A BYTE C'A' +P BYTE C'P' +HCOUNT BYTE X'E10' #3600 in decimal +HCT2 BYTE X'E0F' #3599 +MCOUNT BYTE X'3C' #60 in decimal +MCT2 BYTE X'3B' #59 in decmial +SEVENF WORD 7FFFFF +TWELVE BYTE X'C' +ZERO WORD 0 +ZEROB BYTE X'00' #one byte of zeros to be placed in HOUR and MINUTE at program start +ONE BYTE X'1' #representation of the number 1 for incrementing +HOUR RESB 1 #1 byte for number of hours max 23 +MINUTE RESB 1 #1 byte for number of minutes max 59 +STORE RESW 1 #store value of register A temporarily so another value can be placed for adding +SAVED RESW 1 #saving the timer so unexpected changes wont break the program +OUTPUT BYTE X'40' #output device +TIMER RESW 1 #reserve 1 word for the timer. Needs to end up at address 7FFD (last word in mem) +ENDING END diff --git a/readme.md b/readme.md new file mode 100644 index 0000000..32bc164 --- /dev/null +++ b/readme.md @@ -0,0 +1 @@ +Takes the number of total seconds passed in a day and converts it into 12 hour or 24 hour time, and writes it to the machine. Written in SIC assembly, an educational instruction set. |