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How do I program the microcontroller?

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ericgibbs

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rushi53

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I would suggest you to go for 89s51, as it has ISP (In System Programming)
which means you don't need external/separate programmer.

You can use parallel port. Make connections as below
============================
Printer Port Pins - Microcontroller pins
============================
6 (D4) ---------- 9 Reset
7 (D5) ---------- 6 (P1.5 -MOSI)
8 (D6) ---------- 8 (P1.7 - SCK)
10 (ACK) ------- 7 (P1.6 - MISO)
18-25 (GND) --- 20 (GND)
 
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