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X10 Lighting Control
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This page was last updated on 08/31/2016. Total Pages: 650. Total Files: 937.
X10 control card for TRS-80 Color Computer, Hardware & Software, includes CM17A
It can be used for control Christmas Lights in the house. Put your CoCo to work controling lights & Appliances (other X10 components required)
Control X10 events on/off at specfic times up to 100 events.
Key in X10 commands to control up to 256 devices
X10 card with Real Time Clock & CM17A firecracker transmitter
Tech Note of theory of operation
Basic and Machine Language programs on cassette tape
Hardcopy listing of source code
Copyright 2012 by: John E. Hieber
Tech-Note: Add Real Time Clock to the TRS-80 Color Computer CoCo 1/2/3. This tech-note also includes a circuit to control the X10 CM17A (Firecracker) transmitter.
Sheets 1 thru 6 show schematics for alternate interface circuitry to the DS1302 Real Time Clock. A section of the circuitry implements control of the CM17A transmitter.
Addresses FD00-FDFF are used for these functions.
A. Principle of operation for the DS1302. Address lines A2-A5 are used for the DS1302 several interface lines.
1. A3 is used for the CE (chip enable) pin. Assembly code TST FD08 will set CE to high level. TST FD00 will set CE to a low level.
2. A2 controls the CLK (clock) pin. Code TST FD04 will set CLK high and TST FD00 will set it low.
3. To enable data bits to the I/O (input/output) pin A4 is used. Code TST FD10 enables the data path to the DS1302. Code TST FD00 will disable the path.
4. To send data bits (0/1) to the DS1302 (commands and data), A5 is used in conjunction with A4 of item 3 and A3 of item 2. To send a bit=1 (A5), CE line must be high, I/O line must be high then CLK line must go high. A code sequence like: TST FD08 TST FD38 or FD28 for bit=0 TST FD3C or FD2C for bit=0 will send a data bit (A5)to the DS1302.
5. To read data bits from the DS1302, after a command is sent requesting the value of hour, minute, second, etc. The data path to the DS1302 must be disabled during reading. A data bit is clocked from the DS1302 by setting the CLK pin low. A code sequence like: TST FD08 LDA FD08 TST FD0C will transfer a data bit from the DS1302.
6. Data is sent and received (to/from) the DS1302 low order bit (LSB) first.
B. Principle of operation for the X10 CM17A. Address lines A0 & A1 are used for the CM17A two interface lines. Note, the IC 1488 interface to the CM17a requires +/-12V. Wires must be added internally to bring these voltages to the cartridge 40 pin connector (pins 1 & 2).
7. When the CM17A is in standby both interface line must be at low level. Code TST FD00 will set both lines at zero.
8. To cause the CM17A to transmit a bit=0, A1 is high while A0 is low. Code TST FD02 will set bit=0 state. Likewise to transmit bit=1, code TST FD01 which sets A1 low and A0 high.
9. The CM17A requires the bit state held for 0.25 milliseconds followed by standby state held for 0.25 milliseconds, this results a 0.5 millisecond pulse for each bit transmitted.
10. The code sequence to transmit a bit=0: TST FD02 CALL HLFDLY .25 ms delay TST FD00 CALL HLFDLY .25 ms delay
11. The code sequence to transmit a bit=1: TST FD01 CALL HLFDLY .25 ms delay TST FD00 CALL HLFDLY .25 ms delay
12. A X10 control command consists of 40 bits, a 16 bit header a 16 bit command/unit and a 8 bit trailer.
C. Circuit components are available which include the IC's and DS1302 with the crystal (32.768Kz). Misc parts such as wires, sockets, resistor, capacitors, etc are not included.
D. Software is available which includes functions for both the Real Time Clock and the CM17A X10 transmitter. Includes both executable code and source code on cassette tape. A hard copy of the Machine Language (ML) code is included.
E. Contact the author by e-mailing john.e.hieber at juno.com for availability and prices.
F. Sheet 5 & 6 shows the schematic using programmable peripheral interface adapter IC's. The Z80 PIO and the MC6821.
Basic Program: (Patrial listing)
10 ' CONTROL X10 DEVICES 20 ' COPYRIGHT AUG 2011 30 ' BY JOHN E HIEBER 40 ' REVISED: 5/12/2013 50 CLEAR 1000 60 'MACHINE LANGUAGE LEN=657 70 'CHK PT FILE LEN=607 80 BA=PEEK(27)*256+PEEK(28)-657 90 TB=BA-607 100 'CHK PT FILE DEFINITION 110 'BYTE 1 IS # ENTRY IN FILE 120 'BYTE 2-3 IS TIME FOR FIRST ENTRY 130 'BYTE 4-7 IS CMD OF FIRST ENTRY 140 'REPEAT 2-7 FOR EACH ENTRY 150 IFPEEK(32768)<>ASC("E") THEN 180 160 DEF USR=BA 170 GOTO 200 180 POKE275,INT(BA/256):POKE276,BA-INT(BA/256)*256 190 'CHK PT FILE WORK AREA 200 HA=347:'CUURENT HOUR IN BCD 210 MA=348:'CURRENT MIN IN BCD 220 FX=349:'FUNCTION CALLED 1-5 230 A1=350:'ARGUMENTS 240 A2=351:A3=352 250 DIM CM$(100),TM(100)
3350 '-HELP, DISPLAY KB CMDS 3360 'S9 3370 PRINT"H, HELP, DISPLAY KB CMDS" 3380 PRINT"AHHMM NA2, ADD X10 CMD AT HHMM" 3390 PRINT"THHMM OR T, SET OR SHOW TIME" 3400 PRINT"NA11, TURN ON MOD A UNIT 11" 3410 PRINT"FB7, TURN OFF MOD B UNIT 7" 3420 PRINT"L, DISPLAY LIST OF X10 CMDS" 3430 PRINT"L20-23 OR LS-SORT LIST" 3440 PRINT"Z5-8,DELETE ITEMS 5-8 FROM LIST" 3450 PRINT"ZX, DELETE ALL ITEMS FROM LIST" 3460 PRINT"S, SAVE CMD LIST TO TAPE" 3470 PRINT"SI, SAVE CMD LIST->CHK PT" 3480 PRINT"R, RELOAD CHK PT TAPE->LIST" 3490 PRINT"RA, ADD CHK PT TAPE->LIST" 3500 PRINT"X, BACKUP X10 PROGRAM TO TAPE" 3510 PRINT"XL, BACKUP X10 & LIST TO TAPE" 3520 PRINT"A,F,L,N,R,S,T,X,Z,H"; 3530 RETURN