🚀 go-pugleaf

On Wed, 22 Apr 1998 05:30:21 -0700, Lawrence Foard wrote:

:>Eric Reaburn wrote:
:>> 
:>> Dear Linux hackers,
:>> how difficult (easy?) is it to get low-level program access to the serial and
:>> parallel ports
:>> on an average pentium PC running Red Hat? Ideally I would like DOS-like
:>> direct access
:>> to the hardware, but I guess that's not possible from a "normal" program in
:>> Linux.
:>
:>The two commands to look at are ioperm for enabling port access. You
:>need to setup some inline assembly for inport/outport (look at the X
:>server source for examples, or the kernel). 
:>The second thing you may need is access to physical ram, you can do this
:>by using the mmap call on /dev/mem. You can map a range of physical
:>ram into your process.


Thanks for the info.
Also thanks to the others who replied. Unfortunately while composing a nice
reply
to everyone last night I inadvertantly discovered a key combo to instantly
delete all
trace of my reply and (apparently) original posts. Being late at night I went
to bed...
When I get a couple of hours free I'll try out your suggestions and see how
far I get.
Being a Linux novice this could be a while!

Eric.
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