Posted By
someone
on 2002-10-14
|  > BTW what's in detail your project?
Well, as I stated above the final destination is to develop an adapter which directly connects to the 1551 at one side and to a serial interface (RS232) at the other.
The adapter's software will provide a minimal set of disk access functions for the 1551 (display a directory, read and write sequential files) and control the serial transmission via XMODEM protocol (or something similar). This allows me to use almost any computer having a serial port with any kind of terminal software to transfer files from or to 1551 diskettes (e.g. to store games downloaded form the net).The adapter will be mainly consisting of an 8051 microcontroller and this is the reason why I need the description of the low level access to the 1551's 6523, because I have to implement the control protocol using completely different hardware and assembly language compared to the commodore 7501/8501 processor.
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