Re: 4 PC printer ports
- From: NoSpam@xxxxxxxxxxx (Bob Masta)
- Date: Tue, 31 Oct 2006 13:22:40 GMT
On Tue, 31 Oct 2006 14:13:36 +1100, Lionel <usenet@xxxxxxxxxxxxx>
wrote:
On Mon, 30 Oct 2006 22:40:26 GMT, Randy Day <randy.day@xxxxxxxx>
opined:
I'm wondering if there are any DIY projects
for putting 4 parallel ports on an ISA or
PCI card.
Not that I know of, but read on...
I have a use for 4 ports in one
machine, and I can't find too many commercial
products like this any more...
If you want them in order to run a bunch of printers, the easy answer
is to use networked or USB printers, of which you can attach as many
as you like. If you need to run existing, parallel-only printers, you
can buy USB to parallel converters.
If you want the ports for general I/O purposes (eg; machine control),
you can buy kit or pre-built USB parallel I/O modules very easily, &
they're usually also available with extras like analog I/O ports &
high level language libraries.
If the latter case, the other thing you can do is make a little
multiplexer. There are lots of ways this can be done, but
the simplest is to use 2 bits from the CTRL port to select
one of 4 addresses that you decode to 4 separate lines,
one for each of 4 octal latch enables. The latches are all
connected in parallel to the DATA port. Now when you
write data, it only goes to the selected latch pins. You
can easily extend this scheme at will.
Best regards,
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator
.
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- From: Randy Day
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