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 8051 Test code with 4 bit HD44780 LCD, LEDs, audio frequency generation.
 I _DO NOT_ claim that the code is pretty or "correct." Just fiddling with some stuff :-)
 
-YouTube video showing my breadboard and program operation: https://www.youtube.com/watch?v=Z5JveB2_FQQ
+YouTube video showing my breadboard and program operation: [Intel 8051 Microcontroller Test w External EPROM](https://www.youtube.com/watch?v=Z5JveB2_FQQ)
 
 
 
 I compile with SDCC:
-
+```
 sdcc --iram-size 128 --stack-auto lcd.c
-
 packihx lcd.ihx > lcd.hex
-
+```
 
 Since my EPROM programmer only handles raw hex data, no special formats, I also do: 
-
+```
 objcopy -I ihex -O binary lcd.hex lcd.bin
-
 xxd -p lcd.bin lcd.bin.hex
-
+```
 Those two commands give me a raw binary file, and then convert that binary to the raw ascii hex. 
 
 
 HD44780 LCD is hooked up to MCU as follows:
 
-LCD: DB4|DB5|DB6|DB7|EN |RS    RW
-
-P1:   0   1   2   3   4   5    GND 
-
+>LCD: DB4|DB5|DB6|DB7|EN |RS    RW
+>P1:   0   1   2   3   4   5    GND 
 
 LEDs and piezo buzzer or speaker are hooked to pins of P3. I used 2.7k has pullup resistors for the LCD lines on P1. I think 4.7k would be more correct but the 2.7ks were what I had handy.