Raven. A homemade Atari-like computer

[luciodra]

IMG_1610.jpg

Bad ground connection usually makes it look like that, in my experience.

What exactly are you referring to? I used another psu with no benefits. The usb-serial cable is connected to another female-female serial cable to connect to the Raven's serial. The clock battery is not positioned.
Again thanks to everyone for the help!

[agranlund]

Based on the pattern you are getting I would dismiss rom/ram communication or at least move it furthest down the suspect list.
So, anywhere between 060 and the software on your PC.

Code: Select all

060 -> cpld   -> uart -> max -> cable -> adapter -> driver -> software -> software config
060 ->       -^

Still a broad range and ideally you want to narrow this down to avoid randomly stabbing in the dark.
If it was my board I would inspect the serial stream at suitable locations on Raven by placing Logic Analyzer directly on UART-TX, input to MAX, output from MAX. Basically try to find exactly where the stream breaks apart in order to quite quickly reduce the number of unkowns in the situation.

Without one it'll be more about working with educated guesses.

I do find the output you are getting quite interesting! Do you have a screenshot of it when you enable Hex from the View menu?
Numbers appear to be displayed in a consistently wrong way.
For example "rprtqpru" where we know it should say the rom date. Subtract 0x40 from the chars and it becomes the correct "20241025".
The same applies to all other chars that we know are numbers. At a glance it doesn't seem to follow the same pattern for other ascii ranges though it's hard to tell from looking at chars compared to hex values.
Now, that may not amount to anything but consistent fault patterns can sometimes give clues.

[agranlund]

@luciodra , test this rom with your serial terminal set to 9600 baud.
In the off chance your adapter or cable is rated for 250kbps rather than 1Mbps.

rom_mon.bin.zip

[luciodra]

[luciodra]

@luciodra , test this rom with your serial terminal set to 9600 baud.
In the off chance your adapter or cable is rated for 250kbps rather than 1Mbps.

rom_mon.bin.zip

A video is worth a thousand words... Thank you

PS It works also on MacOS :D

[agranlund]

A video is worth a thousand words... Thank you
PS It works also on MacOS :D

Amazing, that made my day! :cheers:
To my knowledge that makes it the 5th Raven alive :)

I'm going to change the default uart settings then.
Eventually it'll be made changeable from settings, especially if/when we have in-system rom flashing in place.


You should now be able to verify that a bunch of stuff is in working order by running "test ym" from your connected terminal.
That should play the classic Atari bell sound.
(assuming you have fully jumpered J602 to J603 using 4 jumpers + connected some active speakers, or other thing that accepts line-out, to the bottom audio jack J601)

Screenshot 2024-11-06 at 22.04.png

[luciodra]

Amazing, that made my day! :cheers:
To my knowledge that makes it the 5th Raven alive :)

shopping.jpeg

[Oldskool]

A group of Ravens is called "unkindness" or "conspiracy"

According to an old Legend: as long as there is a Raven living in a house Atari will not die.

[kodak80]

I have commenced a Raven060 build here as well. :)

Raven060 kodak80 20241105.jpg

[luciodra]

Ym test performed successfully. Is there such a test for graphics card? Is there anything I can put in the CF for an IDE port test?