How to interface the Borg with the PC

You must use the Micro$oft build environment, Visual C and the proper gpioctl.h I/O control header file.
The BORG board occupies port addresses x300-x307 in the PC's I/O address space. The addresses x300-x303 are reserved for special purposes.

You must build your ports in I/O address space x304-x307 like the port.c program below.

Correspondingly, the ports in the borg board must have the proper decoder to decode the I/O addresses.

To compile your program open a command window from the StartUp Menu by selecting 

   Programs >> Development Kits >> Windows 2000 DDK >> Free Build Environments
The example C program port.c can be compiled in the command window with 
       nmake port.exe
and the following Makefile .

The corresponding "ports" and decoding logic should be in the schematic for R1. In the schematic the signal on bit 0 of the data bus is clocked into the flip-flop when the PC writes to x304. Bits 0 and 1 of the data bus are driven when the PC reads address x305.

The CMPE126 Web:
Copyright 2002; Department of Computer Engineering, University of California, Santa Cruz.
pak@cse.ucsc.edu