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BASIC ELECTRONICS 
Chapter 15 
Sound
Computer Interfacing

 

Directions: Step through the program already prewritten below (First  "Burn Prom" and "Load RAM") . Set (check) switches S1 thru S8 as desired and observe how single stepping thru entire program causes LED's to illuminate in accordance with switch settings.   Next type in your own program (starting at address zero) over the existing program. Burn Prom and then load RAM with zero's. Try writing a program that makes Bit 8 turn on all LED's. Though you have no bit wise operators you can test for >127. 

The voltmeter can be connected to P1-1 thru P1-18 or TP1 thru TP5 and will sample the voltage at the end of each Single Step cycle (Read all Notes at bottom of spec sheet.)     

See or make copy of Instruction Set and SPECIFICATIONS.

Computer Interface Schematic- Click Here! 

Computer Interface Troubleshooting in: Electronic Troubleshooting.

   (View Bottom of page before starting)

COMPUTER CONTROL
 (CPU, ADDER, COMPARATOR)

Register A        Carry       
Register B        A>B       Program Counter
Accumulator    A=B        Instruction Register
                                    A<B
  Data Bus  Address Bus  
--------------------PROM(8X64)----------------RAM(8X16)---------
00      16       32      48      64
01      17       33      49      65
02      18       34      50      66
03      19       35      51      67
04      20       36      52      68
05      21       37      53      69
06      22       38      54      70
07      23       39      55      71
08      24       40      56      72
09      25       41      57      73
10      26       42      58      74
11      27       43      59      75
12      28       44      60      76
13      29       45      61      77
14      30       46      62      78
15      31       47      63      79

      

Interface Assy No.1

LED1            S1           P1-1         Voltmeter       
LED2            S2           P1-2       
LED3            S3           P1-3       
LED4            S4           P1-4        TP1
LED5            S5           P1-5        TP2
LED6            S6           P1-6        TP3
LED7            S7           P1-7        TP4
LED8            S8           P1-8        TP5
                                                Not Used          
                                               P1-10
                                               P1-11 
                                               P1-12  
                                               P1-13  
                                               P1-14  
                                               P1-15  
                                               P1-16  
                                               P1-17  
                                               P1-18  
                                                

                                                                                                                               

 

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