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Old 09 November 2019, 13:54   #1
Turrican_3
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Join Date: Jul 2017
Location: Italy
Posts: 151
A1000 serial issues, and crashes when sending files to SER:

Hey there, it seems my A1000 woes haven't ended yet...

After replacing the faulty RAM chip (there's another thread for that, no need to talk more about that) it seemed everything was fine, but while trying to debug issues with an ACA500+ it was clear I needed to use the serial port.

Unfortunately, all I got from the serial log was a bunch of garbled characters. Same thing happens disconnecting the accelerator.

Still having issues at the receiver side even after having swapped CIAs. :-\

MAJOR (?) UPDATE:

Quote:
Originally Posted by Turrican_3 View Post
Ok since this seemed to go nowhere I decided to connect my (only and cheap!) oscilloscope to the signals coming from my Amiga 500 and 1000.

Unless I'm doing something very wrong with the probes (connected it to TXD and GND, pin 2 and 7 respectively) I see signals going as high as roughly 16V on the A1000 to about 25V on the A500.

Shouldn't it read much, much lower than that?!

I guess this might also explain why the PC adaptor was reading garbage, as I understand it accepts about 5V max.
=======================

THIS PART OF THE ISSUE WASN'T APPARENTLY AN ISSUE AT ALL (WRONG SETTINGS) SO I'M STRIKING IT OUT

I thought, let's make things as simple as possible: physically unplugged the ACA accelerator, and decided to run Workbench 1.3

Opened an Amiga Shell, went to S: and entered "copy #? to SER:"

As soon as the DPAT file copy starts, system hangs.
(this happened on WB3.1 as well for the record with the ACA plugged in, but as I said I wanted to be absolutely sure it wasn't the accelerator that was creating problems - and yes I know it's an unsupported configuration on paper so that was one more reason for me to test the system without installing it)

Please note Amiga Test Kit with the null modem dongle says there's something wrong with the RI signal (pin 22), but keeps running tests as long as I want.


Thoughts?

Last edited by Turrican_3; 10 November 2019 at 17:44.
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