MaxDuino settings?

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jesperp
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Re: MaxDuino settings?

Post by jesperp »

1024mak

Thanks for your input - when getting som gates, i will return the result.
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Jesper Petersen
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jesperp
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Re: MaxDuino settings?

Post by jesperp »

Moggy wrote: Fri Sep 16, 2022 2:40 pm That looks most excellent! :D

One thing for sure is that if this does not cure the problem then it can be eliminated and the fault lies elsewhere.
So, some weeks ago i received the LM386 amplifier.
Turned the signal level from the MaxDuino up from 4,2V to 5,0V, unfortunately without any succes loading any programs into the Lambda.
Så for now the "signallevel to low error " will be put on standby.

Next step is to filter out (with OR gates 74LS32) the EAR signal into the CPU, to see if any signal at all enter the CPU.
Attachments
amplifier.jpg
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Jesper Petersen
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mrtinb
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Re: MaxDuino settings?

Post by mrtinb »

What a journey. We’re cheering you on.
Martin
https://zx.rtin.be
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
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jesperp
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Re: MaxDuino settings?

Post by jesperp »

jesperp wrote: Sun Sep 18, 2022 4:34 pm 1024mak

Thanks for your input - when getting som gates, i will return the result.
So, the 74LS32 fitted on a breadboard - a little breakout board in the back of the Lambda.
Pictures and scope pictures will tell the story.
I am sure 1024mak is able to decode the results. The output from the gates, changes when data is streamed into the EAR input.
Attachments
20221028_5.JPG
20221028_4.JPG
20221028_3.JPG
20221028_1.JPG
20221028 YourComputer Scope CPU PIN 20 or 21 or 30.pdf
(333.3 KiB) Downloaded 13 times
Best regards
Jesper Petersen
Moggy
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Re: MaxDuino settings?

Post by Moggy »

Do not give up jesper.

As Martin says we are cheering you on to have success with this project. :D
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jesperp
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Re: MaxDuino settings?

Post by jesperp »

mrtinb wrote: Mon Aug 29, 2022 4:21 pm Hi Jesper.

I've been thinking about making a video for you, for quite some time, to show how it looks to me, when I load a game on the Lambda 8300.

I hope you can compare the picture and voltages with what you have.

https://youtu.be/riutTeCjOLM
Back again

I have just re-viewed the video Martin did some time ago.

In my setup i am using a LCD monitor wich is showing a fine picture (via the MONITOR output), as long as the Lambda is not loading (LOAD"") from the EAR input. When loading, my LCD monitor is going into a blue screen (waiting for a signal).
Because i am not able to monitor the flickering screen in LOAD-mode, i have no chance comparing my screen stribes/pattern to Martins screen pattern in his video.
Next step, must be to try my setup with another monitor/TV (CRT), connected to the Lamda's antenna output.
I believe this will reveal any signal problems - as for now, my Lamda never ends with the "OK" after a finished LOAD session.
Will find mee a fine small TV set in a second hand shop in the near future....
Last edited by jesperp on Fri Nov 04, 2022 6:09 pm, edited 1 time in total.
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Jesper Petersen
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mrtinb
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Re: MaxDuino settings?

Post by mrtinb »

jesperp wrote: Fri Nov 04, 2022 4:25 pm Next step, must be to try my setup with another monitor/TV (CRT), connected to the Lamda's antenna output.
:
Will find mee a fine small TV set in a second hand shop in the near future....:o)
Good luck finding an old TV my friend.
Martin
https://zx.rtin.be
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
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1024MAK
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Re: MaxDuino settings?

Post by 1024MAK »

I’ll have a look at the attachment and photos in the earlier posts tomorrow.

Mark
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1024MAK
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Re: MaxDuino settings?

Post by 1024MAK »

Okay, real life is getting in the way, I’ve not forgotten.

Mark
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