On 12/10/2010 09:26, Tony Firshman wrote:
Bryan Horstmann wrote, on 12/Oct/10 09:08 | Oct12:
on 10/10/10 11:40 PM, ql-us...@q-v-d.com wrote:
Rich Mellor wrote, on 10/Oct/10 10:33 | Oct10:
On 10/10/2010 09:18, Bryan Horstmann wrote:
One of my customary QL's has gone faulty on the Ser1 port and I dug
out another one fitted with Minerva 1.97. It seems to be fine with a
Sandy expansion, and Trump card, but when I fit a Super Gold card
2.49, the screen shows text Super Gold card, and the Minerva start
panel, but there is no response to F1 or any other key. Aren't they
compatible?
Yes they are (of course)
Does the QL eventually boot (in F2 mode)?
If not then there certainly is something crashed.
Does the SGC work OK in the other QL?
Tony
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The SGC came staight out of my previously working QL whose ser port went
wonky.
I was just about to print out a few lists, and my little printing
program
wouldn't set up the printer properly, so I just swapped the QL.
The screen just stays on with Super Gold Cardat the top and the
Minerva
logo at the bottom, and doesn't progress from there.
I've put an old Trump card in, as I need the disk interface, and that
seems
to be OK.
I haven't the time at present to look into it further. I hadn't
previously
heard about the possible need to remove the 68008.
Neither had I (8-)#
I've six QL's of which three were fully working up the the recent
fault. I
obviously ned to put some repairs in hand! I wonder what would cause
the
Ser port to send wrong characters?
Ah that is different. I had assumed you were simply getting nothing.
I assume you *are* using handshaking (8-)#
Have you tried a really slow baud rate - say 1200?
However serial *output* has never really been a problem.
8302 is serial output and 8049 is input.
I am getting rusty but the two relevant chips are 1488 and 1489 I
believe. First check that the 8302 chip (1488?) is getting +12 and -12v.
Should be as you are getting some output.
Then change the 8302 for one frSGCom a working machine.
Then scope the data, and particularly check the input handshake (CTS
or DTR depending on the port).
It is all a mite messy, hardware-wise.
Tony
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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.
Bryan
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