James Richters wrote:
What I need to do is be able to read some 5v TTL Inputs in and write some 5v TTL outputs out. The parallel port always worked when my program was a DOS program.. it was so simple, just do Port[$378]:= data to set the bits on the port or data:=port[$378] to read some bits from the port. I'm not opposed to some hardware other than a parallel port if it will be able to interface with freepascal easily, if anyone can make a recommendation. Serial ports won't work because they are not made to just read and write bits like the parallel port and they are not TTL voltage levels.
Something like a Velleman K8055, which I've talked to using libusb on Linux. Or an Arduino with appropriate firmware. Or go the whole hog and port the program onto a Raspberry Pi: Bo's doing something like you're asking.
Any of those have the advantage that the electronics can be positioned to minimise the signal run carrying TTL. Long printer cables are generally bad news.
-- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues] _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
