I am using version 9. An occasional life saver.
Hello:
en.wikipedia.org/.../Rhetoric_question
but nobody helps me.
Gabrialle
Where is _your_ thread with any question relating to Keil?
I don't know the capabilities of inpout51.dll, but note that a USB printer adapter is not hardware-compatible with an internal printer port. The driver supplied normally don't have function calls to set individual bits. The driver supports sending large blocks of data through the USB interface to the external hardware. The handling of handshake bits may not even be possible to control by the driver - the controller on the other side would most probably handle everything - all it gets is a block of data, and then it sends it to the printer, or reports back a timeout.
Next issue is that if the driver and hardware do support toggling of individual bits (instead of having the toggling happening in the controller on the other side of the USB interface) then the latencies in the USB transfer will result in very slow operation.
In the end, you should consider using other external equipment. Best is to use newer equipment using USB directly, or at least using a serial port since USB-to-serial normally works quite well.