BryanHorstmann wrote, on 19/Feb/11 11:14 | Feb19:
<printing problems snipped>
Revisiting this subject
Recently I happened to see a reference to the Super Gold Card having an
8049 chip which handles the serial port (amongst other jobs). It could
therefore. be the SGC which is faulty, as the original QL is now working
OK with a Trump card, and the battery on the SGC is down.
It doesn't. SGC has a parallel port which is fault free (as far as I
know!). SGC does *nothing* to the QLs serial ports as far as I know.
Maybe as the QL is running much faster it is simply throwing up a
handshake issue. Try really really low speeds to test.
Serial output (incl printing) is done by the QLs 8302 including
handshaking up to 19200bps. The QL 8049 is for serial input and is
heavily bugged. The practical max was often less than 4800bps. Also if
a handshake was needed when the QL was making a sound, it got forgotten
for a few chrs. The input was then out of phase, and *only* a power
down (not a reset) would cure. There were a number of other bugs.
Hermes (an 8749 to replace the 8049) sorted out those bugs and increased
serial input to around 14400 (nominal 19200).
superHermes also sorted out the bugs, increased the QLs serial ports to
a full 19200 both ways, and added ser3 up to 430800. The practical
maximum input though, even with SGC, is somewhere above 56k, as Adrian
Ives has commented on with his USBwiz devbelopment 115200bps setting is
used as long as handshaking is enabled. Output though is probably much
higher than 115200 but untested.
The limitation in all cases is QL (and destination) processing power and
not superHermes.
Tony
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