🚀 go-pugleaf

I'm using Spectre GCR to do a lot of Mac word processing, as well as
downloading things from my local Internet provider.  I rely on the fact
that the Spectre software turns the Mac serial printer port output into
parallel output on the ST's printer port.  Running MultiFinder I can print
in the background over the printer port and download at the same time.  I
want to go to a serial printer (well, it's more complicated than that, but
I'll explain later), and I'm wondering if I can keep using the printer
port, running the output through a parallel-serial converter.

Has anyone used a parallel to serial adapter on the Atari printer port to
drive serial devices?  
 
I know Spectre internally converts the Mac OS's serial output intended for
a Mac printer port into parallel output, but is anything done for input? 
Is this even a reasonable question? (I don't know of any bidirectional
parallel devices, although I have seen ads for bidirectional
parallel-serial converters.)
 
The GCR manual doesn't go into a lot of depth as to the nature of
Spectre's internal serial-parallel conversion.  A one-way (output only)
conversion would be sufficient to drive parallel printers, but wouldn't
work at all if I tried to hook up a serial device that needed to be able
to talk back.
 
 (Actually, my ultimate goal is even more complicated, involving directing
Spectre printer output through a null-modem cable into a 486 box running a
Unix clone, where a daemon process will handshake like a LaserWriter,
accept the PostScript output, and pipe it to GhostScript, a free Gnu
Public Licensed PostScript emulator... but that's some time in the future)
 
Joe