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I am not familiar with the 8051 but I think that at 11mhz that delay function will take less than 1ms to execute. That second for loop won't do anything, remove the semicolon.
The current is not being reduced, current is only drawn as needed. The purpose of the resistor is to limit the amount of current drawn from the power source, otherwise unlimited power will be drawn because it is effectively a short circuit between power and ground.
A series circuit has to have...
I'd go with the interrupt method, the MCU will easily be fast enough to enter the ISR and recognise which key has been pressed before the user has stopped pressing it.
It sure is, have you tried using a lower baud rate and are you sure you are using the correct handshaking? From a quick look at the GPIB converter manual it expects RTS/CTS.
Unfortunately I don't have any experience with GPIB so I'm sorry I can't be of more help.
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