VT340 Emulation

Maciej W. Rozycki macro at orcam.me.uk
Sat Jun 26 18:08:15 CDT 2021

On Fri, 25 Jun 2021, Paul Koning via cctalk wrote:

> > Well you can find mother boards with real COM port, but they are rare.
> One place you can find them easily is on industrial computers.  My 
> firewall machine is one, because I wanted it to be fanless.  It has the 
> usual pile of USB ports and HDMI, but also 2 COM ports; another model of 
> that same line has 6 COM ports.
> What seems to be harder to find is a parallel printer port, but there is 
> far less reason to want one of those.

 However both serial and parallel ports remain reasonably available as 
PCIe option devices.  Though parallel ports seem to be made as legacy PCIe 
devices only, that is accessed with I/O rather than memory read/write bus 
cycles, which are not, as I have learnt the hard way recently, supported 
by all computer systems nowadays.  I guess x86 systems will continue to 
support them however as x86 CPUs have native I/O access instructions.


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