[Elecraft] suggested PC??? Real RS-232 ports

[Eric Swartz - WA6HHQ, Elecraft]

Folks - we're getting pretty OT. Lets wind this thread down at this time in the 
interest of keeping the signal to noise level reasonable for other readers.

73,

Eric
/elecraft.com/

On 1/5/2016 4:07 PM, WB4JFI wrote:
> Original serial and parallel ports on the original IBM backplane were I/O port mapped, not memory mapped.  There were discrepancies between port numbers between the true IBM I/O port numbers and "clones".  Ports 3F8 and 2F8 for COM1 and 2, 3E8 and 2E8 for COM3 and 4.   On a true original IBM, the first parallel port was 3BC, while most clones used 378 for the first parallel port.  Note that these are input/output mapped, NOT memory mapped.
>
> I'm not sure that PCI and PCIe serial and parallel port devices are truly I/O mapped (probably not), or memory mapped, but in either case, they are not true serial or parallel hardware devices, but something that emulates them.  PCIe is itself a high-speed serial interface, so there must be some interpretation.
>
> Of course, even the older ISA cards ended up using ASIC devices to emulate serial and parallel ports, but that was hardware based.
> 73, Terry, N4TLF
>
> Sent from tfox iPad
>
>> On Jan 5, 2016, at 5:54 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>>
>>
>>> On 1/5/2016 5:32 PM, Doug Person via Elecraft wrote:
>>> A 4-port card is NOT a native RS-232 port. PCI is just another bus
>>> add on.
>> *Absolutely incorrect*.  A USB to serial converter *of any kind* -
>> other than the Edgeport products - can not do 45.45, 50, 75 or 100
>> baud RTTY.  All of the multi-port RS-232 PCI and PCIe cards handle
>> that task with no problem (although Windows will set 45.45 baud to
>> 45 baud because the API is integer based).
>>
>> PCI and PCIe based serial and parallel port cards are true memory
>> addressed ports like motherboard or (obsolete) ISA bus ports - not
>> USB devices that suffer from latency and driver buffer issues.
>>
>> 73,
>>
>>   ... Joe, W4TV
>>
>>
>>> On 1/5/2016 5:32 PM, Doug Person via Elecraft wrote:
>>> A 4-port card is NOT a native RS-232 port. PCI is just another bus add
>>> on.  There no difference between running 1 or 4 USB to RS-232
>>> converters.  You can buy a 4 port FTDI converter that runs off a single
>>> USB port from Amazon that will run everything you could ever want.  I
>>> run 80's vintage lab equipment off them and they don't know the difference.
>>>
>>> Also, don't get Windows 7 or 8.  Windows 10 is the only choice for
>>> Windows.  7 and 8 are obsolete and support will get lighter and lighter
>>> and then vanish completely.
>>>
>>> Doug -- K0DXV
>>>
>>>> On 1/5/2016 12:24 PM, Cliff Frescura wrote:
>>>> I agree with N1MGO,
>>>>
>>>> I've come full circle on this one and am in the process of removing
>>>> all of
>>>> the USB/RS-232 converters in my setup and reinstalling a 4 port card
>>>> that I
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