diff --git a/README.md b/README.md
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@@ -4,23 +4,31 @@ I _DO NOT_ claim that the code is pretty or "correct." Just fiddling with some s
 
 YouTube video showing my breadboard and program operation: https://www.youtube.com/watch?v=Z5JveB2_FQQ
 
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 I compile with SDCC:
 
 sdcc --iram-size 128 --stack-auto lcd.c
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 packihx lcd.ihx > lcd.hex
 
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 Since my EPROM programmer only handles raw hex data, no special formats, I also do: 
 
 objcopy -I ihex -O binary lcd.hex lcd.bin
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 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. 
 
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 HD44780 LCD is hooked up to MCU as follows:
 
 LCD: DB4|DB5|DB6|DB7|EN |RS    RW
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 P1:   0   1   2   3   4   5    GND 
 
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 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.
 
 My test circuit is on a breadboard, with external EPROM chip (27c64, but I also used 27256 and 27c512 with success).